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2to3.html
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__builtin__.html
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__future__.html
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__main__.html
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abc.html
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aifc.html
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al.html
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allos.html
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anydbm.html
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archiving.html
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argparse.html
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array.html
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ast.html
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atexit.html
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audioop.html
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autogil.html
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basehttpserver.html
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bastion.html
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bdb.html
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bz2.html
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calendar.html
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carbon.html
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cd.html
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cgi.html
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cgihttpserver.html
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cgitb.html
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chunk.html
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cmath.html
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cmd.html
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code.html
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codecs.html
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codeop.html
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collections.html
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colorpicker.html
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colorsys.html
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commands.html
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compileall.html
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compiler.html
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configparser.html
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constants.html
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contextlib.html
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cookie.html
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cookielib.html
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copy.html
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crypt.html
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crypto.html
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csv.html
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ctypes.html
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curses.panel.html
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custominterp.html
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datatypes.html
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datetime.html
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dbm.html
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development.html
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dis.html
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distutils.html
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doctest.html
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dumbdbm.html
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dummy_thread.html
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dummy_threading.html
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easydialogs.html
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email-examples.html
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email.charset.html
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email.encoders.html
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email.generator.html
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email.html
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errno.html
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exceptions.html
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fpformat.html
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fractions.html
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framework.html
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frameworks.html
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ftplib.html
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functions.html
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functools.html
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future_builtins.html
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gc.html
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gdbm.html
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gensuitemodule.html
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getopt.html
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getpass.html
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gettext.html
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gl.html
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glob.html
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grp.html
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gzip.html
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hashlib.html
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heapq.html
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hmac.html
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hotshot.html
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htmllib.html
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htmlparser.html
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httplib.html
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i18n.html
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ic.html
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idle.html
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imageop.html
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imaplib.html
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imgfile.html
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imghdr.html
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imp.html
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importlib.html
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imputil.html
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index.html
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inspect.html
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internet.html
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intro.html
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io.html
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ipc.html
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itertools.html
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jpeg.html
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json.html
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keyword.html
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language.html
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linecache.html
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locale.html
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logging.config.html
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logging.handlers.html
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logging.html
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mac.html
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macostools.html
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macpath.html
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mailbox.html
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mailcap.html
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markup.html
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math.html
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md5.html
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mmap.html
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modulefinder.html
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modules.html
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msilib.html
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msvcrt.html
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multiprocessing.html
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mutex.html
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netdata.html
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netrc.html
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new.html
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nis.html
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nntplib.html
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numbers.html
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numeric.html
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operator.html
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othergui.html
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pdb.html
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pickle.html
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profile.html
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py_compile.html
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python.html
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queue.html
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random.html
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re.html
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readline.html
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rfc822.html
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rlcompleter.html
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select.html
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sets.html
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sgi.html
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sgmllib.html
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sha.html
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signal.html
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smtplib.html
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sndhdr.html
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socket.html
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string.html
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tix.html
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tkinter.html
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tokenize.html
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traceback.html
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undoc.html
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unittest.html
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urllib.html
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urlparse.html
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warnings.html
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xml.sax.html
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zipfile.html
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zipimport.html
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zlib.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>7.1. string — Common string operations — Python 2.7.5 documentation</title> <link rel="stylesheet" href="../_static/default.css" type="text/css" /> <link rel="stylesheet" href="../_static/pygments.css" type="text/css" /> <script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT: '../', VERSION: '2.7.5', COLLAPSE_INDEX: false, FILE_SUFFIX: '.html', HAS_SOURCE: true }; </script> <script type="text/javascript" src="../_static/jquery.js"></script> <script type="text/javascript" src="../_static/underscore.js"></script> <script type="text/javascript" src="../_static/doctools.js"></script> <script type="text/javascript" src="../_static/sidebar.js"></script> <link rel="search" type="application/opensearchdescription+xml" title="Search within Python 2.7.5 documentation" href="../_static/opensearch.xml"/> <link rel="author" title="About these documents" href="../about.html" /> <link rel="copyright" title="Copyright" href="../copyright.html" /> <link rel="top" title="Python 2.7.5 documentation" href="../index.html" /> <link rel="up" title="7. 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String Services</a> »</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body"> <div class="section" id="module-string"> <span id="string-common-string-operations"></span><h1>7.1. <a class="reference internal" href="#module-string" title="string: Common string operations."><tt class="xref py py-mod docutils literal"><span class="pre">string</span></tt></a> — Common string operations<a class="headerlink" href="#module-string" title="Permalink to this headline">¶</a></h1> <p id="index-0"><strong>Source code:</strong> <a class="reference external" href="http://hg.python.org/cpython/file/2.7/Lib/string.py">Lib/string.py</a></p> <hr class="docutils" /> <p>The <a class="reference internal" href="#module-string" title="string: Common string operations."><tt class="xref py py-mod docutils literal"><span class="pre">string</span></tt></a> module contains a number of useful constants and classes, as well as some deprecated legacy functions that are also available as methods on strings. In addition, Python’s built-in string classes support the sequence type methods described in the <a class="reference internal" href="stdtypes.html#typesseq"><em>Sequence Types — str, unicode, list, tuple, bytearray, buffer, xrange</em></a> section, and also the string-specific methods described in the <a class="reference internal" href="stdtypes.html#string-methods"><em>String Methods</em></a> section. To output formatted strings use template strings or the <tt class="docutils literal"><span class="pre">%</span></tt> operator described in the <a class="reference internal" href="stdtypes.html#string-formatting"><em>String Formatting Operations</em></a> section. Also, see the <a class="reference internal" href="re.html#module-re" title="re: Regular expression operations."><tt class="xref py py-mod docutils literal"><span class="pre">re</span></tt></a> module for string functions based on regular expressions.</p> <div class="section" id="string-constants"> <h2>7.1.1. String constants<a class="headerlink" href="#string-constants" title="Permalink to this headline">¶</a></h2> <p>The constants defined in this module are:</p> <dl class="data"> <dt id="string.ascii_letters"> <tt class="descclassname">string.</tt><tt class="descname">ascii_letters</tt><a class="headerlink" href="#string.ascii_letters" title="Permalink to this definition">¶</a></dt> <dd><p>The concatenation of the <a class="reference internal" href="#string.ascii_lowercase" title="string.ascii_lowercase"><tt class="xref py py-const docutils literal"><span class="pre">ascii_lowercase</span></tt></a> and <a class="reference internal" href="#string.ascii_uppercase" title="string.ascii_uppercase"><tt class="xref py py-const docutils literal"><span class="pre">ascii_uppercase</span></tt></a> constants described below. This value is not locale-dependent.</p> </dd></dl> <dl class="data"> <dt id="string.ascii_lowercase"> <tt class="descclassname">string.</tt><tt class="descname">ascii_lowercase</tt><a class="headerlink" href="#string.ascii_lowercase" title="Permalink to this definition">¶</a></dt> <dd><p>The lowercase letters <tt class="docutils literal"><span class="pre">'abcdefghijklmnopqrstuvwxyz'</span></tt>. This value is not locale-dependent and will not change.</p> </dd></dl> <dl class="data"> <dt id="string.ascii_uppercase"> <tt class="descclassname">string.</tt><tt class="descname">ascii_uppercase</tt><a class="headerlink" href="#string.ascii_uppercase" title="Permalink to this definition">¶</a></dt> <dd><p>The uppercase letters <tt class="docutils literal"><span class="pre">'ABCDEFGHIJKLMNOPQRSTUVWXYZ'</span></tt>. This value is not locale-dependent and will not change.</p> </dd></dl> <dl class="data"> <dt id="string.digits"> <tt class="descclassname">string.</tt><tt class="descname">digits</tt><a class="headerlink" href="#string.digits" title="Permalink to this definition">¶</a></dt> <dd><p>The string <tt class="docutils literal"><span class="pre">'0123456789'</span></tt>.</p> </dd></dl> <dl class="data"> <dt id="string.hexdigits"> <tt class="descclassname">string.</tt><tt class="descname">hexdigits</tt><a class="headerlink" href="#string.hexdigits" title="Permalink to this definition">¶</a></dt> <dd><p>The string <tt class="docutils literal"><span class="pre">'0123456789abcdefABCDEF'</span></tt>.</p> </dd></dl> <dl class="data"> <dt id="string.letters"> <tt class="descclassname">string.</tt><tt class="descname">letters</tt><a class="headerlink" href="#string.letters" title="Permalink to this definition">¶</a></dt> <dd><p>The concatenation of the strings <a class="reference internal" href="#string.lowercase" title="string.lowercase"><tt class="xref py py-const docutils literal"><span class="pre">lowercase</span></tt></a> and <a class="reference internal" href="#string.uppercase" title="string.uppercase"><tt class="xref py py-const docutils literal"><span class="pre">uppercase</span></tt></a> described below. The specific value is locale-dependent, and will be updated when <a class="reference internal" href="locale.html#locale.setlocale" title="locale.setlocale"><tt class="xref py py-func docutils literal"><span class="pre">locale.setlocale()</span></tt></a> is called.</p> </dd></dl> <dl class="data"> <dt id="string.lowercase"> <tt class="descclassname">string.</tt><tt class="descname">lowercase</tt><a class="headerlink" href="#string.lowercase" title="Permalink to this definition">¶</a></dt> <dd><p>A string containing all the characters that are considered lowercase letters. On most systems this is the string <tt class="docutils literal"><span class="pre">'abcdefghijklmnopqrstuvwxyz'</span></tt>. The specific value is locale-dependent, and will be updated when <a class="reference internal" href="locale.html#locale.setlocale" title="locale.setlocale"><tt class="xref py py-func docutils literal"><span class="pre">locale.setlocale()</span></tt></a> is called.</p> </dd></dl> <dl class="data"> <dt id="string.octdigits"> <tt class="descclassname">string.</tt><tt class="descname">octdigits</tt><a class="headerlink" href="#string.octdigits" title="Permalink to this definition">¶</a></dt> <dd><p>The string <tt class="docutils literal"><span class="pre">'01234567'</span></tt>.</p> </dd></dl> <dl class="data"> <dt id="string.punctuation"> <tt class="descclassname">string.</tt><tt class="descname">punctuation</tt><a class="headerlink" href="#string.punctuation" title="Permalink to this definition">¶</a></dt> <dd><p>String of ASCII characters which are considered punctuation characters in the <tt class="docutils literal"><span class="pre">C</span></tt> locale.</p> </dd></dl> <dl class="data"> <dt id="string.printable"> <tt class="descclassname">string.</tt><tt class="descname">printable</tt><a class="headerlink" href="#string.printable" title="Permalink to this definition">¶</a></dt> <dd><p>String of characters which are considered printable. This is a combination of <a class="reference internal" href="#string.digits" title="string.digits"><tt class="xref py py-const docutils literal"><span class="pre">digits</span></tt></a>, <a class="reference internal" href="#string.letters" title="string.letters"><tt class="xref py py-const docutils literal"><span class="pre">letters</span></tt></a>, <a class="reference internal" href="#string.punctuation" title="string.punctuation"><tt class="xref py py-const docutils literal"><span class="pre">punctuation</span></tt></a>, and <a class="reference internal" href="#string.whitespace" title="string.whitespace"><tt class="xref py py-const docutils literal"><span class="pre">whitespace</span></tt></a>.</p> </dd></dl> <dl class="data"> <dt id="string.uppercase"> <tt class="descclassname">string.</tt><tt class="descname">uppercase</tt><a class="headerlink" href="#string.uppercase" title="Permalink to this definition">¶</a></dt> <dd><p>A string containing all the characters that are considered uppercase letters. On most systems this is the string <tt class="docutils literal"><span class="pre">'ABCDEFGHIJKLMNOPQRSTUVWXYZ'</span></tt>. The specific value is locale-dependent, and will be updated when <a class="reference internal" href="locale.html#locale.setlocale" title="locale.setlocale"><tt class="xref py py-func docutils literal"><span class="pre">locale.setlocale()</span></tt></a> is called.</p> </dd></dl> <dl class="data"> <dt id="string.whitespace"> <tt class="descclassname">string.</tt><tt class="descname">whitespace</tt><a class="headerlink" href="#string.whitespace" title="Permalink to this definition">¶</a></dt> <dd><p>A string containing all characters that are considered whitespace. On most systems this includes the characters space, tab, linefeed, return, formfeed, and vertical tab.</p> </dd></dl> </div> <div class="section" id="string-formatting"> <span id="new-string-formatting"></span><h2>7.1.2. String Formatting<a class="headerlink" href="#string-formatting" title="Permalink to this headline">¶</a></h2> <p class="versionadded"> <span class="versionmodified">New in version 2.6.</span></p> <p>The built-in str and unicode classes provide the ability to do complex variable substitutions and value formatting via the <a class="reference internal" href="stdtypes.html#str.format" title="str.format"><tt class="xref py py-meth docutils literal"><span class="pre">str.format()</span></tt></a> method described in <span class="target" id="index-1"></span><a class="pep reference external" href="http://www.python.org/dev/peps/pep-3101"><strong>PEP 3101</strong></a>. The <a class="reference internal" href="#string.Formatter" title="string.Formatter"><tt class="xref py py-class docutils literal"><span class="pre">Formatter</span></tt></a> class in the <a class="reference internal" href="#module-string" title="string: Common string operations."><tt class="xref py py-mod docutils literal"><span class="pre">string</span></tt></a> module allows you to create and customize your own string formatting behaviors using the same implementation as the built-in <a class="reference internal" href="functions.html#format" title="format"><tt class="xref py py-meth docutils literal"><span class="pre">format()</span></tt></a> method.</p> <dl class="class"> <dt id="string.Formatter"> <em class="property">class </em><tt class="descclassname">string.</tt><tt class="descname">Formatter</tt><a class="headerlink" href="#string.Formatter" title="Permalink to this definition">¶</a></dt> <dd><p>The <a class="reference internal" href="#string.Formatter" title="string.Formatter"><tt class="xref py py-class docutils literal"><span class="pre">Formatter</span></tt></a> class has the following public methods:</p> <dl class="method"> <dt id="string.Formatter.format"> <tt class="descname">format</tt><big>(</big><em>format_string</em>, <em>*args</em>, <em>**kwargs</em><big>)</big><a class="headerlink" href="#string.Formatter.format" title="Permalink to this definition">¶</a></dt> <dd><p><a class="reference internal" href="functions.html#format" title="format"><tt class="xref py py-meth docutils literal"><span class="pre">format()</span></tt></a> is the primary API method. It takes a format string and an arbitrary set of positional and keyword arguments. <a class="reference internal" href="functions.html#format" title="format"><tt class="xref py py-meth docutils literal"><span class="pre">format()</span></tt></a> is just a wrapper that calls <a class="reference internal" href="#string.Formatter.vformat" title="string.Formatter.vformat"><tt class="xref py py-meth docutils literal"><span class="pre">vformat()</span></tt></a>.</p> </dd></dl> <dl class="method"> <dt id="string.Formatter.vformat"> <tt class="descname">vformat</tt><big>(</big><em>format_string</em>, <em>args</em>, <em>kwargs</em><big>)</big><a class="headerlink" href="#string.Formatter.vformat" title="Permalink to this definition">¶</a></dt> <dd><p>This function does the actual work of formatting. It is exposed as a separate function for cases where you want to pass in a predefined dictionary of arguments, rather than unpacking and repacking the dictionary as individual arguments using the <tt class="docutils literal"><span class="pre">*args</span></tt> and <tt class="docutils literal"><span class="pre">**kwargs</span></tt> syntax. <a class="reference internal" href="#string.Formatter.vformat" title="string.Formatter.vformat"><tt class="xref py py-meth docutils literal"><span class="pre">vformat()</span></tt></a> does the work of breaking up the format string into character data and replacement fields. It calls the various methods described below.</p> </dd></dl> <p>In addition, the <a class="reference internal" href="#string.Formatter" title="string.Formatter"><tt class="xref py py-class docutils literal"><span class="pre">Formatter</span></tt></a> defines a number of methods that are intended to be replaced by subclasses:</p> <dl class="method"> <dt id="string.Formatter.parse"> <tt class="descname">parse</tt><big>(</big><em>format_string</em><big>)</big><a class="headerlink" href="#string.Formatter.parse" title="Permalink to this definition">¶</a></dt> <dd><p>Loop over the format_string and return an iterable of tuples (<em>literal_text</em>, <em>field_name</em>, <em>format_spec</em>, <em>conversion</em>). This is used by <a class="reference internal" href="#string.Formatter.vformat" title="string.Formatter.vformat"><tt class="xref py py-meth docutils literal"><span class="pre">vformat()</span></tt></a> to break the string into either literal text, or replacement fields.</p> <p>The values in the tuple conceptually represent a span of literal text followed by a single replacement field. If there is no literal text (which can happen if two replacement fields occur consecutively), then <em>literal_text</em> will be a zero-length string. If there is no replacement field, then the values of <em>field_name</em>, <em>format_spec</em> and <em>conversion</em> will be <tt class="docutils literal"><span class="pre">None</span></tt>.</p> </dd></dl> <dl class="method"> <dt id="string.Formatter.get_field"> <tt class="descname">get_field</tt><big>(</big><em>field_name</em>, <em>args</em>, <em>kwargs</em><big>)</big><a class="headerlink" href="#string.Formatter.get_field" title="Permalink to this definition">¶</a></dt> <dd><p>Given <em>field_name</em> as returned by <a class="reference internal" href="#string.Formatter.parse" title="string.Formatter.parse"><tt class="xref py py-meth docutils literal"><span class="pre">parse()</span></tt></a> (see above), convert it to an object to be formatted. Returns a tuple (obj, used_key). The default version takes strings of the form defined in <span class="target" id="index-2"></span><a class="pep reference external" href="http://www.python.org/dev/peps/pep-3101"><strong>PEP 3101</strong></a>, such as “0[name]” or “label.title”. <em>args</em> and <em>kwargs</em> are as passed in to <a class="reference internal" href="#string.Formatter.vformat" title="string.Formatter.vformat"><tt class="xref py py-meth docutils literal"><span class="pre">vformat()</span></tt></a>. The return value <em>used_key</em> has the same meaning as the <em>key</em> parameter to <a class="reference internal" href="#string.Formatter.get_value" title="string.Formatter.get_value"><tt class="xref py py-meth docutils literal"><span class="pre">get_value()</span></tt></a>.</p> </dd></dl> <dl class="method"> <dt id="string.Formatter.get_value"> <tt class="descname">get_value</tt><big>(</big><em>key</em>, <em>args</em>, <em>kwargs</em><big>)</big><a class="headerlink" href="#string.Formatter.get_value" title="Permalink to this definition">¶</a></dt> <dd><p>Retrieve a given field value. The <em>key</em> argument will be either an integer or a string. If it is an integer, it represents the index of the positional argument in <em>args</em>; if it is a string, then it represents a named argument in <em>kwargs</em>.</p> <p>The <em>args</em> parameter is set to the list of positional arguments to <a class="reference internal" href="#string.Formatter.vformat" title="string.Formatter.vformat"><tt class="xref py py-meth docutils literal"><span class="pre">vformat()</span></tt></a>, and the <em>kwargs</em> parameter is set to the dictionary of keyword arguments.</p> <p>For compound field names, these functions are only called for the first component of the field name; Subsequent components are handled through normal attribute and indexing operations.</p> <p>So for example, the field expression ‘0.name’ would cause <a class="reference internal" href="#string.Formatter.get_value" title="string.Formatter.get_value"><tt class="xref py py-meth docutils literal"><span class="pre">get_value()</span></tt></a> to be called with a <em>key</em> argument of 0. The <tt class="docutils literal"><span class="pre">name</span></tt> attribute will be looked up after <a class="reference internal" href="#string.Formatter.get_value" title="string.Formatter.get_value"><tt class="xref py py-meth docutils literal"><span class="pre">get_value()</span></tt></a> returns by calling the built-in <a class="reference internal" href="functions.html#getattr" title="getattr"><tt class="xref py py-func docutils literal"><span class="pre">getattr()</span></tt></a> function.</p> <p>If the index or keyword refers to an item that does not exist, then an <a class="reference internal" href="exceptions.html#exceptions.IndexError" title="exceptions.IndexError"><tt class="xref py py-exc docutils literal"><span class="pre">IndexError</span></tt></a> or <a class="reference internal" href="exceptions.html#exceptions.KeyError" title="exceptions.KeyError"><tt class="xref py py-exc docutils literal"><span class="pre">KeyError</span></tt></a> should be raised.</p> </dd></dl> <dl class="method"> <dt id="string.Formatter.check_unused_args"> <tt class="descname">check_unused_args</tt><big>(</big><em>used_args</em>, <em>args</em>, <em>kwargs</em><big>)</big><a class="headerlink" href="#string.Formatter.check_unused_args" title="Permalink to this definition">¶</a></dt> <dd><p>Implement checking for unused arguments if desired. The arguments to this function is the set of all argument keys that were actually referred to in the format string (integers for positional arguments, and strings for named arguments), and a reference to the <em>args</em> and <em>kwargs</em> that was passed to vformat. The set of unused args can be calculated from these parameters. <a class="reference internal" href="#string.Formatter.check_unused_args" title="string.Formatter.check_unused_args"><tt class="xref py py-meth docutils literal"><span class="pre">check_unused_args()</span></tt></a> is assumed to raise an exception if the check fails.</p> </dd></dl> <dl class="method"> <dt id="string.Formatter.format_field"> <tt class="descname">format_field</tt><big>(</big><em>value</em>, <em>format_spec</em><big>)</big><a class="headerlink" href="#string.Formatter.format_field" title="Permalink to this definition">¶</a></dt> <dd><p><a class="reference internal" href="#string.Formatter.format_field" title="string.Formatter.format_field"><tt class="xref py py-meth docutils literal"><span class="pre">format_field()</span></tt></a> simply calls the global <a class="reference internal" href="functions.html#format" title="format"><tt class="xref py py-func docutils literal"><span class="pre">format()</span></tt></a> built-in. The method is provided so that subclasses can override it.</p> </dd></dl> <dl class="method"> <dt id="string.Formatter.convert_field"> <tt class="descname">convert_field</tt><big>(</big><em>value</em>, <em>conversion</em><big>)</big><a class="headerlink" href="#string.Formatter.convert_field" title="Permalink to this definition">¶</a></dt> <dd><p>Converts the value (returned by <a class="reference internal" href="#string.Formatter.get_field" title="string.Formatter.get_field"><tt class="xref py py-meth docutils literal"><span class="pre">get_field()</span></tt></a>) given a conversion type (as in the tuple returned by the <a class="reference internal" href="#string.Formatter.parse" title="string.Formatter.parse"><tt class="xref py py-meth docutils literal"><span class="pre">parse()</span></tt></a> method). The default version understands ‘s’ (str), ‘r’ (repr) and ‘a’ (ascii) conversion types.</p> </dd></dl> </dd></dl> </div> <div class="section" id="format-string-syntax"> <span id="formatstrings"></span><h2>7.1.3. Format String Syntax<a class="headerlink" href="#format-string-syntax" title="Permalink to this headline">¶</a></h2> <p>The <a class="reference internal" href="stdtypes.html#str.format" title="str.format"><tt class="xref py py-meth docutils literal"><span class="pre">str.format()</span></tt></a> method and the <a class="reference internal" href="#string.Formatter" title="string.Formatter"><tt class="xref py py-class docutils literal"><span class="pre">Formatter</span></tt></a> class share the same syntax for format strings (although in the case of <a class="reference internal" href="#string.Formatter" title="string.Formatter"><tt class="xref py py-class docutils literal"><span class="pre">Formatter</span></tt></a>, subclasses can define their own format string syntax).</p> <p>Format strings contain “replacement fields” surrounded by curly braces <tt class="docutils literal"><span class="pre">{}</span></tt>. Anything that is not contained in braces is considered literal text, which is copied unchanged to the output. If you need to include a brace character in the literal text, it can be escaped by doubling: <tt class="docutils literal"><span class="pre">{{</span></tt> and <tt class="docutils literal"><span class="pre">}}</span></tt>.</p> <p>The grammar for a replacement field is as follows:</p> <blockquote> <div><pre> <strong id="grammar-token-replacement_field">replacement_field</strong> ::= "{" [<a class="reference internal" href="#grammar-token-field_name"><tt class="xref docutils literal"><span class="pre">field_name</span></tt></a>] ["!" <a class="reference internal" href="#grammar-token-conversion"><tt class="xref docutils literal"><span class="pre">conversion</span></tt></a>] [":" <a class="reference internal" href="#grammar-token-format_spec"><tt class="xref docutils literal"><span class="pre">format_spec</span></tt></a>] "}" <strong id="grammar-token-field_name">field_name </strong> ::= arg_name ("." <a class="reference internal" href="#grammar-token-attribute_name"><tt class="xref docutils literal"><span class="pre">attribute_name</span></tt></a> | "[" <a class="reference internal" href="#grammar-token-element_index"><tt class="xref docutils literal"><span class="pre">element_index</span></tt></a> "]")* <strong id="grammar-token-arg_name">arg_name </strong> ::= [<a class="reference internal" href="../reference/lexical_analysis.html#grammar-token-identifier"><tt class="xref docutils literal"><span class="pre">identifier</span></tt></a> | <a class="reference internal" href="../reference/lexical_analysis.html#grammar-token-integer"><tt class="xref docutils literal"><span class="pre">integer</span></tt></a>] <strong id="grammar-token-attribute_name">attribute_name </strong> ::= <a class="reference internal" href="../reference/lexical_analysis.html#grammar-token-identifier"><tt class="xref docutils literal"><span class="pre">identifier</span></tt></a> <strong id="grammar-token-element_index">element_index </strong> ::= <a class="reference internal" href="../reference/lexical_analysis.html#grammar-token-integer"><tt class="xref docutils literal"><span class="pre">integer</span></tt></a> | <a class="reference internal" href="#grammar-token-index_string"><tt class="xref docutils literal"><span class="pre">index_string</span></tt></a> <strong id="grammar-token-index_string">index_string </strong> ::= <any source character except "]"> + <strong id="grammar-token-conversion">conversion </strong> ::= "r" | "s" <strong id="grammar-token-format_spec">format_spec </strong> ::= <described in the next section> </pre> </div></blockquote> <p>In less formal terms, the replacement field can start with a <em>field_name</em> that specifies the object whose value is to be formatted and inserted into the output instead of the replacement field. The <em>field_name</em> is optionally followed by a <em>conversion</em> field, which is preceded by an exclamation point <tt class="docutils literal"><span class="pre">'!'</span></tt>, and a <em>format_spec</em>, which is preceded by a colon <tt class="docutils literal"><span class="pre">':'</span></tt>. These specify a non-default format for the replacement value.</p> <p>See also the <a class="reference internal" href="#formatspec"><em>Format Specification Mini-Language</em></a> section.</p> <p>The <em>field_name</em> itself begins with an <em>arg_name</em> that is either a number or a keyword. If it’s a number, it refers to a positional argument, and if it’s a keyword, it refers to a named keyword argument. If the numerical arg_names in a format string are 0, 1, 2, ... in sequence, they can all be omitted (not just some) and the numbers 0, 1, 2, ... will be automatically inserted in that order. Because <em>arg_name</em> is not quote-delimited, it is not possible to specify arbitrary dictionary keys (e.g., the strings <tt class="docutils literal"><span class="pre">'10'</span></tt> or <tt class="docutils literal"><span class="pre">':-]'</span></tt>) within a format string. The <em>arg_name</em> can be followed by any number of index or attribute expressions. An expression of the form <tt class="docutils literal"><span class="pre">'.name'</span></tt> selects the named attribute using <a class="reference internal" href="functions.html#getattr" title="getattr"><tt class="xref py py-func docutils literal"><span class="pre">getattr()</span></tt></a>, while an expression of the form <tt class="docutils literal"><span class="pre">'[index]'</span></tt> does an index lookup using <a class="reference internal" href="../reference/datamodel.html#object.__getitem__" title="object.__getitem__"><tt class="xref py py-func docutils literal"><span class="pre">__getitem__()</span></tt></a>.</p> <p class="versionchanged"> <span class="versionmodified">Changed in version 2.7: </span>The positional argument specifiers can be omitted, so <tt class="docutils literal"><span class="pre">'{}</span> <span class="pre">{}'</span></tt> is equivalent to <tt class="docutils literal"><span class="pre">'{0}</span> <span class="pre">{1}'</span></tt>.</p> <p>Some simple format string examples:</p> <div class="highlight-python"><div class="highlight"><pre><span class="s">"First, thou shalt count to {0}"</span> <span class="c"># References first positional argument</span> <span class="s">"Bring me a {}"</span> <span class="c"># Implicitly references the first positional argument</span> <span class="s">"From {} to {}"</span> <span class="c"># Same as "From {0} to {1}"</span> <span class="s">"My quest is {name}"</span> <span class="c"># References keyword argument 'name'</span> <span class="s">"Weight in tons {0.weight}"</span> <span class="c"># 'weight' attribute of first positional arg</span> <span class="s">"Units destroyed: {players[0]}"</span> <span class="c"># First element of keyword argument 'players'.</span> </pre></div> </div> <p>The <em>conversion</em> field causes a type coercion before formatting. Normally, the job of formatting a value is done by the <tt class="xref py py-meth docutils literal"><span class="pre">__format__()</span></tt> method of the value itself. However, in some cases it is desirable to force a type to be formatted as a string, overriding its own definition of formatting. By converting the value to a string before calling <tt class="xref py py-meth docutils literal"><span class="pre">__format__()</span></tt>, the normal formatting logic is bypassed.</p> <p>Two conversion flags are currently supported: <tt class="docutils literal"><span class="pre">'!s'</span></tt> which calls <a class="reference internal" href="functions.html#str" title="str"><tt class="xref py py-func docutils literal"><span class="pre">str()</span></tt></a> on the value, and <tt class="docutils literal"><span class="pre">'!r'</span></tt> which calls <a class="reference internal" href="repr.html#module-repr" title="repr: Alternate repr() implementation with size limits."><tt class="xref py py-func docutils literal"><span class="pre">repr()</span></tt></a>.</p> <p>Some examples:</p> <div class="highlight-python"><div class="highlight"><pre><span class="s">"Harold's a clever {0!s}"</span> <span class="c"># Calls str() on the argument first</span> <span class="s">"Bring out the holy {name!r}"</span> <span class="c"># Calls repr() on the argument first</span> </pre></div> </div> <p>The <em>format_spec</em> field contains a specification of how the value should be presented, including such details as field width, alignment, padding, decimal precision and so on. Each value type can define its own “formatting mini-language” or interpretation of the <em>format_spec</em>.</p> <p>Most built-in types support a common formatting mini-language, which is described in the next section.</p> <p>A <em>format_spec</em> field can also include nested replacement fields within it. These nested replacement fields can contain only a field name; conversion flags and format specifications are not allowed. The replacement fields within the format_spec are substituted before the <em>format_spec</em> string is interpreted. This allows the formatting of a value to be dynamically specified.</p> <p>See the <a class="reference internal" href="#formatexamples"><em>Format examples</em></a> section for some examples.</p> <div class="section" id="format-specification-mini-language"> <span id="formatspec"></span><h3>7.1.3.1. Format Specification Mini-Language<a class="headerlink" href="#format-specification-mini-language" title="Permalink to this headline">¶</a></h3> <p>“Format specifications” are used within replacement fields contained within a format string to define how individual values are presented (see <a class="reference internal" href="#formatstrings"><em>Format String Syntax</em></a>). They can also be passed directly to the built-in <a class="reference internal" href="functions.html#format" title="format"><tt class="xref py py-func docutils literal"><span class="pre">format()</span></tt></a> function. Each formattable type may define how the format specification is to be interpreted.</p> <p>Most built-in types implement the following options for format specifications, although some of the formatting options are only supported by the numeric types.</p> <p>A general convention is that an empty format string (<tt class="docutils literal"><span class="pre">""</span></tt>) produces the same result as if you had called <a class="reference internal" href="functions.html#str" title="str"><tt class="xref py py-func docutils literal"><span class="pre">str()</span></tt></a> on the value. A non-empty format string typically modifies the result.</p> <p>The general form of a <em>standard format specifier</em> is:</p> <pre> <strong id="id1">format_spec</strong> ::= [[<a class="reference internal" href="#grammar-token-fill"><tt class="xref docutils literal"><span class="pre">fill</span></tt></a>]<a class="reference internal" href="#grammar-token-align"><tt class="xref docutils literal"><span class="pre">align</span></tt></a>][<a class="reference internal" href="#grammar-token-sign"><tt class="xref docutils literal"><span class="pre">sign</span></tt></a>][#][0][<a class="reference internal" href="#grammar-token-width"><tt class="xref docutils literal"><span class="pre">width</span></tt></a>][,][.<a class="reference internal" href="#grammar-token-precision"><tt class="xref docutils literal"><span class="pre">precision</span></tt></a>][<a class="reference internal" href="#grammar-token-type"><tt class="xref docutils literal"><span class="pre">type</span></tt></a>] <strong id="grammar-token-fill">fill </strong> ::= <a character other than '{' or '}'> <strong id="grammar-token-align">align </strong> ::= "<" | ">" | "=" | "^" <strong id="grammar-token-sign">sign </strong> ::= "+" | "-" | " " <strong id="grammar-token-width">width </strong> ::= <a class="reference internal" href="../reference/lexical_analysis.html#grammar-token-integer"><tt class="xref docutils literal"><span class="pre">integer</span></tt></a> <strong id="grammar-token-precision">precision </strong> ::= <a class="reference internal" href="../reference/lexical_analysis.html#grammar-token-integer"><tt class="xref docutils literal"><span class="pre">integer</span></tt></a> <strong id="grammar-token-type">type </strong> ::= "b" | "c" | "d" | "e" | "E" | "f" | "F" | "g" | "G" | "n" | "o" | "s" | "x" | "X" | "%" </pre> <p>The <em>fill</em> character can be any character other than ‘{‘ or ‘}’. The presence of a fill character is signaled by the character following it, which must be one of the alignment options. If the second character of <em>format_spec</em> is not a valid alignment option, then it is assumed that both the fill character and the alignment option are absent.</p> <p>The meaning of the various alignment options is as follows:</p> <blockquote> <div><table border="1" class="docutils"> <colgroup> <col width="13%" /> <col width="87%" /> </colgroup> <thead valign="bottom"> <tr class="row-odd"><th class="head">Option</th> <th class="head">Meaning</th> </tr> </thead> <tbody valign="top"> <tr class="row-even"><td><tt class="docutils literal"><span class="pre">'<'</span></tt></td> <td>Forces the field to be left-aligned within the available space (this is the default for most objects).</td> </tr> <tr class="row-odd"><td><tt class="docutils literal"><span class="pre">'>'</span></tt></td> <td>Forces the field to be right-aligned within the available space (this is the default for numbers).</td> </tr> <tr class="row-even"><td><tt class="docutils literal"><span class="pre">'='</span></tt></td> <td>Forces the padding to be placed after the sign (if any) but before the digits. This is used for printing fields in the form ‘+000000120’. This alignment option is only valid for numeric types.</td> </tr> <tr class="row-odd"><td><tt class="docutils literal"><span class="pre">'^'</span></tt></td> <td>Forces the field to be centered within the available space.</td> </tr> </tbody> </table> </div></blockquote> <p>Note that unless a minimum field width is defined, the field width will always be the same size as the data to fill it, so that the alignment option has no meaning in this case.</p> <p>The <em>sign</em> option is only valid for number types, and can be one of the following:</p> <blockquote> <div><table border="1" class="docutils"> <colgroup> <col width="13%" /> <col width="87%" /> </colgroup> <thead valign="bottom"> <tr class="row-odd"><th class="head">Option</th> <th class="head">Meaning</th> </tr> </thead> <tbody valign="top"> <tr class="row-even"><td><tt class="docutils literal"><span class="pre">'+'</span></tt></td> <td>indicates that a sign should be used for both positive as well as negative numbers.</td> </tr> <tr class="row-odd"><td><tt class="docutils literal"><span class="pre">'-'</span></tt></td> <td>indicates that a sign should be used only for negative numbers (this is the default behavior).</td> </tr> <tr class="row-even"><td>space</td> <td>indicates that a leading space should be used on positive numbers, and a minus sign on negative numbers.</td> </tr> </tbody> </table> </div></blockquote> <p>The <tt class="docutils literal"><span class="pre">'#'</span></tt> option is only valid for integers, and only for binary, octal, or hexadecimal output. If present, it specifies that the output will be prefixed by <tt class="docutils literal"><span class="pre">'0b'</span></tt>, <tt class="docutils literal"><span class="pre">'0o'</span></tt>, or <tt class="docutils literal"><span class="pre">'0x'</span></tt>, respectively.</p> <p>The <tt class="docutils literal"><span class="pre">','</span></tt> option signals the use of a comma for a thousands separator. For a locale aware separator, use the <tt class="docutils literal"><span class="pre">'n'</span></tt> integer presentation type instead.</p> <p class="versionchanged"> <span class="versionmodified">Changed in version 2.7: </span>Added the <tt class="docutils literal"><span class="pre">','</span></tt> option (see also <span class="target" id="index-3"></span><a class="pep reference external" href="http://www.python.org/dev/peps/pep-0378"><strong>PEP 378</strong></a>).</p> <p><em>width</em> is a decimal integer defining the minimum field width. If not specified, then the field width will be determined by the content.</p> <p>Preceding the <em>width</em> field by a zero (<tt class="docutils literal"><span class="pre">'0'</span></tt>) character enables sign-aware zero-padding for numeric types. This is equivalent to a <em>fill</em> character of <tt class="docutils literal"><span class="pre">'0'</span></tt> with an <em>alignment</em> type of <tt class="docutils literal"><span class="pre">'='</span></tt>.</p> <p>The <em>precision</em> is a decimal number indicating how many digits should be displayed after the decimal point for a floating point value formatted with <tt class="docutils literal"><span class="pre">'f'</span></tt> and <tt class="docutils literal"><span class="pre">'F'</span></tt>, or before and after the decimal point for a floating point value formatted with <tt class="docutils literal"><span class="pre">'g'</span></tt> or <tt class="docutils literal"><span class="pre">'G'</span></tt>. For non-number types the field indicates the maximum field size - in other words, how many characters will be used from the field content. The <em>precision</em> is not allowed for integer values.</p> <p>Finally, the <em>type</em> determines how the data should be presented.</p> <p>The available string presentation types are:</p> <blockquote> <div><table border="1" class="docutils"> <colgroup> <col width="13%" /> <col width="87%" /> </colgroup> <thead valign="bottom"> <tr class="row-odd"><th class="head">Type</th> <th class="head">Meaning</th> </tr> </thead> <tbody valign="top"> <tr class="row-even"><td><tt class="docutils literal"><span class="pre">'s'</span></tt></td> <td>String format. This is the default type for strings and may be omitted.</td> </tr> <tr class="row-odd"><td>None</td> <td>The same as <tt class="docutils literal"><span class="pre">'s'</span></tt>.</td> </tr> </tbody> </table> </div></blockquote> <p>The available integer presentation types are:</p> <blockquote> <div><table border="1" class="docutils"> <colgroup> <col width="13%" /> <col width="87%" /> </colgroup> <thead valign="bottom"> <tr class="row-odd"><th class="head">Type</th> <th class="head">Meaning</th> </tr> </thead> <tbody valign="top"> <tr class="row-even"><td><tt class="docutils literal"><span class="pre">'b'</span></tt></td> <td>Binary format. Outputs the number in base 2.</td> </tr> <tr class="row-odd"><td><tt class="docutils literal"><span class="pre">'c'</span></tt></td> <td>Character. Converts the integer to the corresponding unicode character before printing.</td> </tr> <tr class="row-even"><td><tt class="docutils literal"><span class="pre">'d'</span></tt></td> <td>Decimal Integer. Outputs the number in base 10.</td> </tr> <tr class="row-odd"><td><tt class="docutils literal"><span class="pre">'o'</span></tt></td> <td>Octal format. Outputs the number in base 8.</td> </tr> <tr class="row-even"><td><tt class="docutils literal"><span class="pre">'x'</span></tt></td> <td>Hex format. Outputs the number in base 16, using lower- case letters for the digits above 9.</td> </tr> <tr class="row-odd"><td><tt class="docutils literal"><span class="pre">'X'</span></tt></td> <td>Hex format. Outputs the number in base 16, using upper- case letters for the digits above 9.</td> </tr> <tr class="row-even"><td><tt class="docutils literal"><span class="pre">'n'</span></tt></td> <td>Number. This is the same as <tt class="docutils literal"><span class="pre">'d'</span></tt>, except that it uses the current locale setting to insert the appropriate number separator characters.</td> </tr> <tr class="row-odd"><td>None</td> <td>The same as <tt class="docutils literal"><span class="pre">'d'</span></tt>.</td> </tr> </tbody> </table> </div></blockquote> <p>In addition to the above presentation types, integers can be formatted with the floating point presentation types listed below (except <tt class="docutils literal"><span class="pre">'n'</span></tt> and None). When doing so, <a class="reference internal" href="functions.html#float" title="float"><tt class="xref py py-func docutils literal"><span class="pre">float()</span></tt></a> is used to convert the integer to a floating point number before formatting.</p> <p>The available presentation types for floating point and decimal values are:</p> <blockquote> <div><table border="1" class="docutils"> <colgroup> <col width="13%" /> <col width="87%" /> </colgroup> <thead valign="bottom"> <tr class="row-odd"><th class="head">Type</th> <th class="head">Meaning</th> </tr> </thead> <tbody valign="top"> <tr class="row-even"><td><tt class="docutils literal"><span class="pre">'e'</span></tt></td> <td>Exponent notation. Prints the number in scientific notation using the letter ‘e’ to indicate the exponent. The default precision is <tt class="docutils literal"><span class="pre">6</span></tt>.</td> </tr> <tr class="row-odd"><td><tt class="docutils literal"><span class="pre">'E'</span></tt></td> <td>Exponent notation. Same as <tt class="docutils literal"><span class="pre">'e'</span></tt> except it uses an upper case ‘E’ as the separator character.</td> </tr> <tr class="row-even"><td><tt class="docutils literal"><span class="pre">'f'</span></tt></td> <td>Fixed point. Displays the number as a fixed-point number. The default precision is <tt class="docutils literal"><span class="pre">6</span></tt>.</td> </tr> <tr class="row-odd"><td><tt class="docutils literal"><span class="pre">'F'</span></tt></td> <td>Fixed point. Same as <tt class="docutils literal"><span class="pre">'f'</span></tt>.</td> </tr> <tr class="row-even"><td><tt class="docutils literal"><span class="pre">'g'</span></tt></td> <td><p class="first">General format. For a given precision <tt class="docutils literal"><span class="pre">p</span> <span class="pre">>=</span> <span class="pre">1</span></tt>, this rounds the number to <tt class="docutils literal"><span class="pre">p</span></tt> significant digits and then formats the result in either fixed-point format or in scientific notation, depending on its magnitude.</p> <p>The precise rules are as follows: suppose that the result formatted with presentation type <tt class="docutils literal"><span class="pre">'e'</span></tt> and precision <tt class="docutils literal"><span class="pre">p-1</span></tt> would have exponent <tt class="docutils literal"><span class="pre">exp</span></tt>. Then if <tt class="docutils literal"><span class="pre">-4</span> <span class="pre"><=</span> <span class="pre">exp</span> <span class="pre"><</span> <span class="pre">p</span></tt>, the number is formatted with presentation type <tt class="docutils literal"><span class="pre">'f'</span></tt> and precision <tt class="docutils literal"><span class="pre">p-1-exp</span></tt>. Otherwise, the number is formatted with presentation type <tt class="docutils literal"><span class="pre">'e'</span></tt> and precision <tt class="docutils literal"><span class="pre">p-1</span></tt>. In both cases insignificant trailing zeros are removed from the significand, and the decimal point is also removed if there are no remaining digits following it.</p> <p>Positive and negative infinity, positive and negative zero, and nans, are formatted as <tt class="docutils literal"><span class="pre">inf</span></tt>, <tt class="docutils literal"><span class="pre">-inf</span></tt>, <tt class="docutils literal"><span class="pre">0</span></tt>, <tt class="docutils literal"><span class="pre">-0</span></tt> and <tt class="docutils literal"><span class="pre">nan</span></tt> respectively, regardless of the precision.</p> <p class="last">A precision of <tt class="docutils literal"><span class="pre">0</span></tt> is treated as equivalent to a precision of <tt class="docutils literal"><span class="pre">1</span></tt>. The default precision is <tt class="docutils literal"><span class="pre">6</span></tt>.</p> </td> </tr> <tr class="row-odd"><td><tt class="docutils literal"><span class="pre">'G'</span></tt></td> <td>General format. Same as <tt class="docutils literal"><span class="pre">'g'</span></tt> except switches to <tt class="docutils literal"><span class="pre">'E'</span></tt> if the number gets too large. The representations of infinity and NaN are uppercased, too.</td> </tr> <tr class="row-even"><td><tt class="docutils literal"><span class="pre">'n'</span></tt></td> <td>Number. This is the same as <tt class="docutils literal"><span class="pre">'g'</span></tt>, except that it uses the current locale setting to insert the appropriate number separator characters.</td> </tr> <tr class="row-odd"><td><tt class="docutils literal"><span class="pre">'%'</span></tt></td> <td>Percentage. Multiplies the number by 100 and displays in fixed (<tt class="docutils literal"><span class="pre">'f'</span></tt>) format, followed by a percent sign.</td> </tr> <tr class="row-even"><td>None</td> <td>The same as <tt class="docutils literal"><span class="pre">'g'</span></tt>.</td> </tr> </tbody> </table> </div></blockquote> </div> <div class="section" id="format-examples"> <span id="formatexamples"></span><h3>7.1.3.2. Format examples<a class="headerlink" href="#format-examples" title="Permalink to this headline">¶</a></h3> <p>This section contains examples of the new format syntax and comparison with the old <tt class="docutils literal"><span class="pre">%</span></tt>-formatting.</p> <p>In most of the cases the syntax is similar to the old <tt class="docutils literal"><span class="pre">%</span></tt>-formatting, with the addition of the <tt class="docutils literal"><span class="pre">{}</span></tt> and with <tt class="docutils literal"><span class="pre">:</span></tt> used instead of <tt class="docutils literal"><span class="pre">%</span></tt>. For example, <tt class="docutils literal"><span class="pre">'%03.2f'</span></tt> can be translated to <tt class="docutils literal"><span class="pre">'{:03.2f}'</span></tt>.</p> <p>The new format syntax also supports new and different options, shown in the follow examples.</p> <p>Accessing arguments by position:</p> <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="s">'{0}, {1}, {2}'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="s">'a'</span><span class="p">,</span> <span class="s">'b'</span><span class="p">,</span> <span class="s">'c'</span><span class="p">)</span> <span class="go">'a, b, c'</span> <span class="gp">>>> </span><span class="s">'{}, {}, {}'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="s">'a'</span><span class="p">,</span> <span class="s">'b'</span><span class="p">,</span> <span class="s">'c'</span><span class="p">)</span> <span class="c"># 2.7+ only</span> <span class="go">'a, b, c'</span> <span class="gp">>>> </span><span class="s">'{2}, {1}, {0}'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="s">'a'</span><span class="p">,</span> <span class="s">'b'</span><span class="p">,</span> <span class="s">'c'</span><span class="p">)</span> <span class="go">'c, b, a'</span> <span class="gp">>>> </span><span class="s">'{2}, {1}, {0}'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="o">*</span><span class="s">'abc'</span><span class="p">)</span> <span class="c"># unpacking argument sequence</span> <span class="go">'c, b, a'</span> <span class="gp">>>> </span><span class="s">'{0}{1}{0}'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="s">'abra'</span><span class="p">,</span> <span class="s">'cad'</span><span class="p">)</span> <span class="c"># arguments' indices can be repeated</span> <span class="go">'abracadabra'</span> </pre></div> </div> <p>Accessing arguments by name:</p> <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="s">'Coordinates: {latitude}, {longitude}'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">latitude</span><span class="o">=</span><span class="s">'37.24N'</span><span class="p">,</span> <span class="n">longitude</span><span class="o">=</span><span class="s">'-115.81W'</span><span class="p">)</span> <span class="go">'Coordinates: 37.24N, -115.81W'</span> <span class="gp">>>> </span><span class="n">coord</span> <span class="o">=</span> <span class="p">{</span><span class="s">'latitude'</span><span class="p">:</span> <span class="s">'37.24N'</span><span class="p">,</span> <span class="s">'longitude'</span><span class="p">:</span> <span class="s">'-115.81W'</span><span class="p">}</span> <span class="gp">>>> </span><span class="s">'Coordinates: {latitude}, {longitude}'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="o">**</span><span class="n">coord</span><span class="p">)</span> <span class="go">'Coordinates: 37.24N, -115.81W'</span> </pre></div> </div> <p>Accessing arguments’ attributes:</p> <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="n">c</span> <span class="o">=</span> <span class="mi">3</span><span class="o">-</span><span class="mi">5</span><span class="n">j</span> <span class="gp">>>> </span><span class="p">(</span><span class="s">'The complex number {0} is formed from the real part {0.real} '</span> <span class="gp">... </span> <span class="s">'and the imaginary part {0.imag}.'</span><span class="p">)</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">c</span><span class="p">)</span> <span class="go">'The complex number (3-5j) is formed from the real part 3.0 and the imaginary part -5.0.'</span> <span class="gp">>>> </span><span class="k">class</span> <span class="nc">Point</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span> <span class="gp">... </span> <span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">x</span><span class="p">,</span> <span class="n">y</span><span class="p">):</span> <span class="gp">... </span> <span class="bp">self</span><span class="o">.</span><span class="n">x</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">y</span> <span class="o">=</span> <span class="n">x</span><span class="p">,</span> <span class="n">y</span> <span class="gp">... </span> <span class="k">def</span> <span class="nf">__str__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="gp">... </span> <span class="k">return</span> <span class="s">'Point({self.x}, {self.y})'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="bp">self</span><span class="o">=</span><span class="bp">self</span><span class="p">)</span> <span class="gp">...</span> <span class="gp">>>> </span><span class="nb">str</span><span class="p">(</span><span class="n">Point</span><span class="p">(</span><span class="mi">4</span><span class="p">,</span> <span class="mi">2</span><span class="p">))</span> <span class="go">'Point(4, 2)'</span> </pre></div> </div> <p>Accessing arguments’ items:</p> <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="n">coord</span> <span class="o">=</span> <span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="mi">5</span><span class="p">)</span> <span class="gp">>>> </span><span class="s">'X: {0[0]}; Y: {0[1]}'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">coord</span><span class="p">)</span> <span class="go">'X: 3; Y: 5'</span> </pre></div> </div> <p>Replacing <tt class="docutils literal"><span class="pre">%s</span></tt> and <tt class="docutils literal"><span class="pre">%r</span></tt>:</p> <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="s">"repr() shows quotes: {!r}; str() doesn't: {!s}"</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="s">'test1'</span><span class="p">,</span> <span class="s">'test2'</span><span class="p">)</span> <span class="go">"repr() shows quotes: 'test1'; str() doesn't: test2"</span> </pre></div> </div> <p>Aligning the text and specifying a width:</p> <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="s">'{:<30}'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="s">'left aligned'</span><span class="p">)</span> <span class="go">'left aligned '</span> <span class="gp">>>> </span><span class="s">'{:>30}'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="s">'right aligned'</span><span class="p">)</span> <span class="go">' right aligned'</span> <span class="gp">>>> </span><span class="s">'{:^30}'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="s">'centered'</span><span class="p">)</span> <span class="go">' centered '</span> <span class="gp">>>> </span><span class="s">'{:*^30}'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="s">'centered'</span><span class="p">)</span> <span class="c"># use '*' as a fill char</span> <span class="go">'***********centered***********'</span> </pre></div> </div> <p>Replacing <tt class="docutils literal"><span class="pre">%+f</span></tt>, <tt class="docutils literal"><span class="pre">%-f</span></tt>, and <tt class="docutils literal"><span class="pre">%</span> <span class="pre">f</span></tt> and specifying a sign:</p> <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="s">'{:+f}; {:+f}'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="mf">3.14</span><span class="p">,</span> <span class="o">-</span><span class="mf">3.14</span><span class="p">)</span> <span class="c"># show it always</span> <span class="go">'+3.140000; -3.140000'</span> <span class="gp">>>> </span><span class="s">'{: f}; {: f}'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="mf">3.14</span><span class="p">,</span> <span class="o">-</span><span class="mf">3.14</span><span class="p">)</span> <span class="c"># show a space for positive numbers</span> <span class="go">' 3.140000; -3.140000'</span> <span class="gp">>>> </span><span class="s">'{:-f}; {:-f}'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="mf">3.14</span><span class="p">,</span> <span class="o">-</span><span class="mf">3.14</span><span class="p">)</span> <span class="c"># show only the minus -- same as '{:f}; {:f}'</span> <span class="go">'3.140000; -3.140000'</span> </pre></div> </div> <p>Replacing <tt class="docutils literal"><span class="pre">%x</span></tt> and <tt class="docutils literal"><span class="pre">%o</span></tt> and converting the value to different bases:</p> <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="c"># format also supports binary numbers</span> <span class="gp">>>> </span><span class="s">"int: {0:d}; hex: {0:x}; oct: {0:o}; bin: {0:b}"</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="mi">42</span><span class="p">)</span> <span class="go">'int: 42; hex: 2a; oct: 52; bin: 101010'</span> <span class="gp">>>> </span><span class="c"># with 0x, 0o, or 0b as prefix:</span> <span class="gp">>>> </span><span class="s">"int: {0:d}; hex: {0:#x}; oct: {0:#o}; bin: {0:#b}"</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="mi">42</span><span class="p">)</span> <span class="go">'int: 42; hex: 0x2a; oct: 0o52; bin: 0b101010'</span> </pre></div> </div> <p>Using the comma as a thousands separator:</p> <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="s">'{:,}'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="mi">1234567890</span><span class="p">)</span> <span class="go">'1,234,567,890'</span> </pre></div> </div> <p>Expressing a percentage:</p> <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="n">points</span> <span class="o">=</span> <span class="mf">19.5</span> <span class="gp">>>> </span><span class="n">total</span> <span class="o">=</span> <span class="mi">22</span> <span class="gp">>>> </span><span class="s">'Correct answers: {:.2%}'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">points</span><span class="o">/</span><span class="n">total</span><span class="p">)</span> <span class="go">'Correct answers: 88.64%'</span> </pre></div> </div> <p>Using type-specific formatting:</p> <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">datetime</span> <span class="gp">>>> </span><span class="n">d</span> <span class="o">=</span> <span class="n">datetime</span><span class="o">.</span><span class="n">datetime</span><span class="p">(</span><span class="mi">2010</span><span class="p">,</span> <span class="mi">7</span><span class="p">,</span> <span class="mi">4</span><span class="p">,</span> <span class="mi">12</span><span class="p">,</span> <span class="mi">15</span><span class="p">,</span> <span class="mi">58</span><span class="p">)</span> <span class="gp">>>> </span><span class="s">'{:%Y-%m-</span><span class="si">%d</span><span class="s"> %H:%M:%S}'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">d</span><span class="p">)</span> <span class="go">'2010-07-04 12:15:58'</span> </pre></div> </div> <p>Nesting arguments and more complex examples:</p> <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="k">for</span> <span class="n">align</span><span class="p">,</span> <span class="n">text</span> <span class="ow">in</span> <span class="nb">zip</span><span class="p">(</span><span class="s">'<^>'</span><span class="p">,</span> <span class="p">[</span><span class="s">'left'</span><span class="p">,</span> <span class="s">'center'</span><span class="p">,</span> <span class="s">'right'</span><span class="p">]):</span> <span class="gp">... </span> <span class="s">'{0:{fill}{align}16}'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">text</span><span class="p">,</span> <span class="n">fill</span><span class="o">=</span><span class="n">align</span><span class="p">,</span> <span class="n">align</span><span class="o">=</span><span class="n">align</span><span class="p">)</span> <span class="gp">...</span> <span class="go">'left<<<<<<<<<<<<'</span> <span class="go">'^^^^^center^^^^^'</span> <span class="go">'>>>>>>>>>>>right'</span> <span class="go">>>></span> <span class="gp">>>> </span><span class="n">octets</span> <span class="o">=</span> <span class="p">[</span><span class="mi">192</span><span class="p">,</span> <span class="mi">168</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">1</span><span class="p">]</span> <span class="gp">>>> </span><span class="s">'{:02X}{:02X}{:02X}{:02X}'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="o">*</span><span class="n">octets</span><span class="p">)</span> <span class="go">'C0A80001'</span> <span class="gp">>>> </span><span class="nb">int</span><span class="p">(</span><span class="n">_</span><span class="p">,</span> <span class="mi">16</span><span class="p">)</span> <span class="go">3232235521</span> <span class="go">>>></span> <span class="gp">>>> </span><span class="n">width</span> <span class="o">=</span> <span class="mi">5</span> <span class="gp">>>> </span><span class="k">for</span> <span class="n">num</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">5</span><span class="p">,</span><span class="mi">12</span><span class="p">):</span> <span class="gp">... </span> <span class="k">for</span> <span class="n">base</span> <span class="ow">in</span> <span class="s">'dXob'</span><span class="p">:</span> <span class="gp">... </span> <span class="k">print</span> <span class="s">'{0:{width}{base}}'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">num</span><span class="p">,</span> <span class="n">base</span><span class="o">=</span><span class="n">base</span><span class="p">,</span> <span class="n">width</span><span class="o">=</span><span class="n">width</span><span class="p">),</span> <span class="gp">... </span> <span class="k">print</span> <span class="gp">...</span> <span class="go"> 5 5 5 101</span> <span class="go"> 6 6 6 110</span> <span class="go"> 7 7 7 111</span> <span class="go"> 8 8 10 1000</span> <span class="go"> 9 9 11 1001</span> <span class="go"> 10 A 12 1010</span> <span class="go"> 11 B 13 1011</span> </pre></div> </div> </div> </div> <div class="section" id="template-strings"> <h2>7.1.4. Template strings<a class="headerlink" href="#template-strings" title="Permalink to this headline">¶</a></h2> <p class="versionadded"> <span class="versionmodified">New in version 2.4.</span></p> <p>Templates provide simpler string substitutions as described in <span class="target" id="index-4"></span><a class="pep reference external" href="http://www.python.org/dev/peps/pep-0292"><strong>PEP 292</strong></a>. Instead of the normal <tt class="docutils literal"><span class="pre">%</span></tt>-based substitutions, Templates support <tt class="docutils literal"><span class="pre">$</span></tt>-based substitutions, using the following rules:</p> <ul class="simple"> <li><tt class="docutils literal"><span class="pre">$$</span></tt> is an escape; it is replaced with a single <tt class="docutils literal"><span class="pre">$</span></tt>.</li> <li><tt class="docutils literal"><span class="pre">$identifier</span></tt> names a substitution placeholder matching a mapping key of <tt class="docutils literal"><span class="pre">"identifier"</span></tt>. By default, <tt class="docutils literal"><span class="pre">"identifier"</span></tt> must spell a Python identifier. The first non-identifier character after the <tt class="docutils literal"><span class="pre">$</span></tt> character terminates this placeholder specification.</li> <li><tt class="docutils literal"><span class="pre">${identifier}</span></tt> is equivalent to <tt class="docutils literal"><span class="pre">$identifier</span></tt>. It is required when valid identifier characters follow the placeholder but are not part of the placeholder, such as <tt class="docutils literal"><span class="pre">"${noun}ification"</span></tt>.</li> </ul> <p>Any other appearance of <tt class="docutils literal"><span class="pre">$</span></tt> in the string will result in a <a class="reference internal" href="exceptions.html#exceptions.ValueError" title="exceptions.ValueError"><tt class="xref py py-exc docutils literal"><span class="pre">ValueError</span></tt></a> being raised.</p> <p>The <a class="reference internal" href="#module-string" title="string: Common string operations."><tt class="xref py py-mod docutils literal"><span class="pre">string</span></tt></a> module provides a <a class="reference internal" href="#string.Template" title="string.Template"><tt class="xref py py-class docutils literal"><span class="pre">Template</span></tt></a> class that implements these rules. The methods of <a class="reference internal" href="#string.Template" title="string.Template"><tt class="xref py py-class docutils literal"><span class="pre">Template</span></tt></a> are:</p> <dl class="class"> <dt id="string.Template"> <em class="property">class </em><tt class="descclassname">string.</tt><tt class="descname">Template</tt><big>(</big><em>template</em><big>)</big><a class="headerlink" href="#string.Template" title="Permalink to this definition">¶</a></dt> <dd><p>The constructor takes a single argument which is the template string.</p> <dl class="method"> <dt id="string.Template.substitute"> <tt class="descname">substitute</tt><big>(</big><em>mapping</em><span class="optional">[</span>, <em>**kws</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#string.Template.substitute" title="Permalink to this definition">¶</a></dt> <dd><p>Performs the template substitution, returning a new string. <em>mapping</em> is any dictionary-like object with keys that match the placeholders in the template. Alternatively, you can provide keyword arguments, where the keywords are the placeholders. When both <em>mapping</em> and <em>kws</em> are given and there are duplicates, the placeholders from <em>kws</em> take precedence.</p> </dd></dl> <dl class="method"> <dt id="string.Template.safe_substitute"> <tt class="descname">safe_substitute</tt><big>(</big><em>mapping</em><span class="optional">[</span>, <em>**kws</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#string.Template.safe_substitute" title="Permalink to this definition">¶</a></dt> <dd><p>Like <a class="reference internal" href="#string.Template.substitute" title="string.Template.substitute"><tt class="xref py py-meth docutils literal"><span class="pre">substitute()</span></tt></a>, except that if placeholders are missing from <em>mapping</em> and <em>kws</em>, instead of raising a <a class="reference internal" href="exceptions.html#exceptions.KeyError" title="exceptions.KeyError"><tt class="xref py py-exc docutils literal"><span class="pre">KeyError</span></tt></a> exception, the original placeholder will appear in the resulting string intact. Also, unlike with <a class="reference internal" href="#string.Template.substitute" title="string.Template.substitute"><tt class="xref py py-meth docutils literal"><span class="pre">substitute()</span></tt></a>, any other appearances of the <tt class="docutils literal"><span class="pre">$</span></tt> will simply return <tt class="docutils literal"><span class="pre">$</span></tt> instead of raising <a class="reference internal" href="exceptions.html#exceptions.ValueError" title="exceptions.ValueError"><tt class="xref py py-exc docutils literal"><span class="pre">ValueError</span></tt></a>.</p> <p>While other exceptions may still occur, this method is called “safe” because substitutions always tries to return a usable string instead of raising an exception. In another sense, <a class="reference internal" href="#string.Template.safe_substitute" title="string.Template.safe_substitute"><tt class="xref py py-meth docutils literal"><span class="pre">safe_substitute()</span></tt></a> may be anything other than safe, since it will silently ignore malformed templates containing dangling delimiters, unmatched braces, or placeholders that are not valid Python identifiers.</p> </dd></dl> <p><a class="reference internal" href="#string.Template" title="string.Template"><tt class="xref py py-class docutils literal"><span class="pre">Template</span></tt></a> instances also provide one public data attribute:</p> <dl class="attribute"> <dt id="string.Template.template"> <tt class="descname">template</tt><a class="headerlink" href="#string.Template.template" title="Permalink to this definition">¶</a></dt> <dd><p>This is the object passed to the constructor’s <em>template</em> argument. In general, you shouldn’t change it, but read-only access is not enforced.</p> </dd></dl> </dd></dl> <p>Here is an example of how to use a Template:</p> <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="kn">from</span> <span class="nn">string</span> <span class="kn">import</span> <span class="n">Template</span> <span class="gp">>>> </span><span class="n">s</span> <span class="o">=</span> <span class="n">Template</span><span class="p">(</span><span class="s">'$who likes $what'</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">s</span><span class="o">.</span><span class="n">substitute</span><span class="p">(</span><span class="n">who</span><span class="o">=</span><span class="s">'tim'</span><span class="p">,</span> <span class="n">what</span><span class="o">=</span><span class="s">'kung pao'</span><span class="p">)</span> <span class="go">'tim likes kung pao'</span> <span class="gp">>>> </span><span class="n">d</span> <span class="o">=</span> <span class="nb">dict</span><span class="p">(</span><span class="n">who</span><span class="o">=</span><span class="s">'tim'</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">Template</span><span class="p">(</span><span class="s">'Give $who $100'</span><span class="p">)</span><span class="o">.</span><span class="n">substitute</span><span class="p">(</span><span class="n">d</span><span class="p">)</span> <span class="gt">Traceback (most recent call last):</span> <span class="c">...</span> <span class="gr">ValueError: Invalid placeholder in string</span>: <span class="n">line 1, col 11</span> <span class="gp">>>> </span><span class="n">Template</span><span class="p">(</span><span class="s">'$who likes $what'</span><span class="p">)</span><span class="o">.</span><span class="n">substitute</span><span class="p">(</span><span class="n">d</span><span class="p">)</span> <span class="gt">Traceback (most recent call last):</span> <span class="c">...</span> <span class="gr">KeyError</span>: <span class="n">'what'</span> <span class="gp">>>> </span><span class="n">Template</span><span class="p">(</span><span class="s">'$who likes $what'</span><span class="p">)</span><span class="o">.</span><span class="n">safe_substitute</span><span class="p">(</span><span class="n">d</span><span class="p">)</span> <span class="go">'tim likes $what'</span> </pre></div> </div> <p>Advanced usage: you can derive subclasses of <a class="reference internal" href="#string.Template" title="string.Template"><tt class="xref py py-class docutils literal"><span class="pre">Template</span></tt></a> to customize the placeholder syntax, delimiter character, or the entire regular expression used to parse template strings. To do this, you can override these class attributes:</p> <ul class="simple"> <li><em>delimiter</em> – This is the literal string describing a placeholder introducing delimiter. The default value is <tt class="docutils literal"><span class="pre">$</span></tt>. Note that this should <em>not</em> be a regular expression, as the implementation will call <a class="reference internal" href="re.html#re.escape" title="re.escape"><tt class="xref py py-meth docutils literal"><span class="pre">re.escape()</span></tt></a> on this string as needed.</li> <li><em>idpattern</em> – This is the regular expression describing the pattern for non-braced placeholders (the braces will be added automatically as appropriate). The default value is the regular expression <tt class="docutils literal"><span class="pre">[_a-z][_a-z0-9]*</span></tt>.</li> </ul> <p>Alternatively, you can provide the entire regular expression pattern by overriding the class attribute <em>pattern</em>. If you do this, the value must be a regular expression object with four named capturing groups. The capturing groups correspond to the rules given above, along with the invalid placeholder rule:</p> <ul class="simple"> <li><em>escaped</em> – This group matches the escape sequence, e.g. <tt class="docutils literal"><span class="pre">$$</span></tt>, in the default pattern.</li> <li><em>named</em> – This group matches the unbraced placeholder name; it should not include the delimiter in capturing group.</li> <li><em>braced</em> – This group matches the brace enclosed placeholder name; it should not include either the delimiter or braces in the capturing group.</li> <li><em>invalid</em> – This group matches any other delimiter pattern (usually a single delimiter), and it should appear last in the regular expression.</li> </ul> </div> <div class="section" id="string-functions"> <h2>7.1.5. String functions<a class="headerlink" href="#string-functions" title="Permalink to this headline">¶</a></h2> <p>The following functions are available to operate on string and Unicode objects. They are not available as string methods.</p> <dl class="function"> <dt id="string.capwords"> <tt class="descclassname">string.</tt><tt class="descname">capwords</tt><big>(</big><em>s</em><span class="optional">[</span>, <em>sep</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#string.capwords" title="Permalink to this definition">¶</a></dt> <dd><p>Split the argument into words using <a class="reference internal" href="stdtypes.html#str.split" title="str.split"><tt class="xref py py-meth docutils literal"><span class="pre">str.split()</span></tt></a>, capitalize each word using <a class="reference internal" href="stdtypes.html#str.capitalize" title="str.capitalize"><tt class="xref py py-meth docutils literal"><span class="pre">str.capitalize()</span></tt></a>, and join the capitalized words using <a class="reference internal" href="stdtypes.html#str.join" title="str.join"><tt class="xref py py-meth docutils literal"><span class="pre">str.join()</span></tt></a>. If the optional second argument <em>sep</em> is absent or <tt class="docutils literal"><span class="pre">None</span></tt>, runs of whitespace characters are replaced by a single space and leading and trailing whitespace are removed, otherwise <em>sep</em> is used to split and join the words.</p> </dd></dl> <dl class="function"> <dt id="string.maketrans"> <tt class="descclassname">string.</tt><tt class="descname">maketrans</tt><big>(</big><em>from</em>, <em>to</em><big>)</big><a class="headerlink" href="#string.maketrans" title="Permalink to this definition">¶</a></dt> <dd><p>Return a translation table suitable for passing to <a class="reference internal" href="#string.translate" title="string.translate"><tt class="xref py py-func docutils literal"><span class="pre">translate()</span></tt></a>, that will map each character in <em>from</em> into the character at the same position in <em>to</em>; <em>from</em> and <em>to</em> must have the same length.</p> <div class="admonition note"> <p class="first admonition-title">Note</p> <p class="last">Don’t use strings derived from <a class="reference internal" href="#string.lowercase" title="string.lowercase"><tt class="xref py py-const docutils literal"><span class="pre">lowercase</span></tt></a> and <a class="reference internal" href="#string.uppercase" title="string.uppercase"><tt class="xref py py-const docutils literal"><span class="pre">uppercase</span></tt></a> as arguments; in some locales, these don’t have the same length. For case conversions, always use <a class="reference internal" href="stdtypes.html#str.lower" title="str.lower"><tt class="xref py py-meth docutils literal"><span class="pre">str.lower()</span></tt></a> and <a class="reference internal" href="stdtypes.html#str.upper" title="str.upper"><tt class="xref py py-meth docutils literal"><span class="pre">str.upper()</span></tt></a>.</p> </div> </dd></dl> </div> <div class="section" id="deprecated-string-functions"> <h2>7.1.6. Deprecated string functions<a class="headerlink" href="#deprecated-string-functions" title="Permalink to this headline">¶</a></h2> <p>The following list of functions are also defined as methods of string and Unicode objects; see section <a class="reference internal" href="stdtypes.html#string-methods"><em>String Methods</em></a> for more information on those. You should consider these functions as deprecated, although they will not be removed until Python 3. The functions defined in this module are:</p> <dl class="function"> <dt id="string.atof"> <tt class="descclassname">string.</tt><tt class="descname">atof</tt><big>(</big><em>s</em><big>)</big><a class="headerlink" href="#string.atof" title="Permalink to this definition">¶</a></dt> <dd><p class="deprecated"> <span class="versionmodified">Deprecated since version 2.0: </span>Use the <a class="reference internal" href="functions.html#float" title="float"><tt class="xref py py-func docutils literal"><span class="pre">float()</span></tt></a> built-in function.</p> <p id="index-5">Convert a string to a floating point number. The string must have the standard syntax for a floating point literal in Python, optionally preceded by a sign (<tt class="docutils literal"><span class="pre">+</span></tt> or <tt class="docutils literal"><span class="pre">-</span></tt>). Note that this behaves identical to the built-in function <a class="reference internal" href="functions.html#float" title="float"><tt class="xref py py-func docutils literal"><span class="pre">float()</span></tt></a> when passed a string.</p> <div class="admonition note"> <p class="first admonition-title">Note</p> <p class="last" id="index-6">When passing in a string, values for NaN and Infinity may be returned, depending on the underlying C library. The specific set of strings accepted which cause these values to be returned depends entirely on the C library and is known to vary.</p> </div> </dd></dl> <dl class="function"> <dt id="string.atoi"> <tt class="descclassname">string.</tt><tt class="descname">atoi</tt><big>(</big><em>s</em><span class="optional">[</span>, <em>base</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#string.atoi" title="Permalink to this definition">¶</a></dt> <dd><p class="deprecated"> <span class="versionmodified">Deprecated since version 2.0: </span>Use the <a class="reference internal" href="functions.html#int" title="int"><tt class="xref py py-func docutils literal"><span class="pre">int()</span></tt></a> built-in function.</p> <p id="index-7">Convert string <em>s</em> to an integer in the given <em>base</em>. The string must consist of one or more digits, optionally preceded by a sign (<tt class="docutils literal"><span class="pre">+</span></tt> or <tt class="docutils literal"><span class="pre">-</span></tt>). The <em>base</em> defaults to 10. If it is 0, a default base is chosen depending on the leading characters of the string (after stripping the sign): <tt class="docutils literal"><span class="pre">0x</span></tt> or <tt class="docutils literal"><span class="pre">0X</span></tt> means 16, <tt class="docutils literal"><span class="pre">0</span></tt> means 8, anything else means 10. If <em>base</em> is 16, a leading <tt class="docutils literal"><span class="pre">0x</span></tt> or <tt class="docutils literal"><span class="pre">0X</span></tt> is always accepted, though not required. This behaves identically to the built-in function <a class="reference internal" href="functions.html#int" title="int"><tt class="xref py py-func docutils literal"><span class="pre">int()</span></tt></a> when passed a string. (Also note: for a more flexible interpretation of numeric literals, use the built-in function <a class="reference internal" href="functions.html#eval" title="eval"><tt class="xref py py-func docutils literal"><span class="pre">eval()</span></tt></a>.)</p> </dd></dl> <dl class="function"> <dt id="string.atol"> <tt class="descclassname">string.</tt><tt class="descname">atol</tt><big>(</big><em>s</em><span class="optional">[</span>, <em>base</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#string.atol" title="Permalink to this definition">¶</a></dt> <dd><p class="deprecated"> <span class="versionmodified">Deprecated since version 2.0: </span>Use the <a class="reference internal" href="functions.html#long" title="long"><tt class="xref py py-func docutils literal"><span class="pre">long()</span></tt></a> built-in function.</p> <p id="index-8">Convert string <em>s</em> to a long integer in the given <em>base</em>. The string must consist of one or more digits, optionally preceded by a sign (<tt class="docutils literal"><span class="pre">+</span></tt> or <tt class="docutils literal"><span class="pre">-</span></tt>). The <em>base</em> argument has the same meaning as for <a class="reference internal" href="#string.atoi" title="string.atoi"><tt class="xref py py-func docutils literal"><span class="pre">atoi()</span></tt></a>. A trailing <tt class="docutils literal"><span class="pre">l</span></tt> or <tt class="docutils literal"><span class="pre">L</span></tt> is not allowed, except if the base is 0. Note that when invoked without <em>base</em> or with <em>base</em> set to 10, this behaves identical to the built-in function <a class="reference internal" href="functions.html#long" title="long"><tt class="xref py py-func docutils literal"><span class="pre">long()</span></tt></a> when passed a string.</p> </dd></dl> <dl class="function"> <dt id="string.capitalize"> <tt class="descclassname">string.</tt><tt class="descname">capitalize</tt><big>(</big><em>word</em><big>)</big><a class="headerlink" href="#string.capitalize" title="Permalink to this definition">¶</a></dt> <dd><p>Return a copy of <em>word</em> with only its first character capitalized.</p> </dd></dl> <dl class="function"> <dt id="string.expandtabs"> <tt class="descclassname">string.</tt><tt class="descname">expandtabs</tt><big>(</big><em>s</em><span class="optional">[</span>, <em>tabsize</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#string.expandtabs" title="Permalink to this definition">¶</a></dt> <dd><p>Expand tabs in a string replacing them by one or more spaces, depending on the current column and the given tab size. The column number is reset to zero after each newline occurring in the string. This doesn’t understand other non-printing characters or escape sequences. The tab size defaults to 8.</p> </dd></dl> <dl class="function"> <dt id="string.find"> <tt class="descclassname">string.</tt><tt class="descname">find</tt><big>(</big><em>s</em>, <em>sub</em><span class="optional">[</span>, <em>start</em><span class="optional">[</span>, <em>end</em><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#string.find" title="Permalink to this definition">¶</a></dt> <dd><p>Return the lowest index in <em>s</em> where the substring <em>sub</em> is found such that <em>sub</em> is wholly contained in <tt class="docutils literal"><span class="pre">s[start:end]</span></tt>. Return <tt class="docutils literal"><span class="pre">-1</span></tt> on failure. Defaults for <em>start</em> and <em>end</em> and interpretation of negative values is the same as for slices.</p> </dd></dl> <dl class="function"> <dt id="string.rfind"> <tt class="descclassname">string.</tt><tt class="descname">rfind</tt><big>(</big><em>s</em>, <em>sub</em><span class="optional">[</span>, <em>start</em><span class="optional">[</span>, <em>end</em><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#string.rfind" title="Permalink to this definition">¶</a></dt> <dd><p>Like <a class="reference internal" href="#string.find" title="string.find"><tt class="xref py py-func docutils literal"><span class="pre">find()</span></tt></a> but find the highest index.</p> </dd></dl> <dl class="function"> <dt id="string.index"> <tt class="descclassname">string.</tt><tt class="descname">index</tt><big>(</big><em>s</em>, <em>sub</em><span class="optional">[</span>, <em>start</em><span class="optional">[</span>, <em>end</em><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#string.index" title="Permalink to this definition">¶</a></dt> <dd><p>Like <a class="reference internal" href="#string.find" title="string.find"><tt class="xref py py-func docutils literal"><span class="pre">find()</span></tt></a> but raise <a class="reference internal" href="exceptions.html#exceptions.ValueError" title="exceptions.ValueError"><tt class="xref py py-exc docutils literal"><span class="pre">ValueError</span></tt></a> when the substring is not found.</p> </dd></dl> <dl class="function"> <dt id="string.rindex"> <tt class="descclassname">string.</tt><tt class="descname">rindex</tt><big>(</big><em>s</em>, <em>sub</em><span class="optional">[</span>, <em>start</em><span class="optional">[</span>, <em>end</em><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#string.rindex" title="Permalink to this definition">¶</a></dt> <dd><p>Like <a class="reference internal" href="#string.rfind" title="string.rfind"><tt class="xref py py-func docutils literal"><span class="pre">rfind()</span></tt></a> but raise <a class="reference internal" href="exceptions.html#exceptions.ValueError" title="exceptions.ValueError"><tt class="xref py py-exc docutils literal"><span class="pre">ValueError</span></tt></a> when the substring is not found.</p> </dd></dl> <dl class="function"> <dt id="string.count"> <tt class="descclassname">string.</tt><tt class="descname">count</tt><big>(</big><em>s</em>, <em>sub</em><span class="optional">[</span>, <em>start</em><span class="optional">[</span>, <em>end</em><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#string.count" title="Permalink to this definition">¶</a></dt> <dd><p>Return the number of (non-overlapping) occurrences of substring <em>sub</em> in string <tt class="docutils literal"><span class="pre">s[start:end]</span></tt>. Defaults for <em>start</em> and <em>end</em> and interpretation of negative values are the same as for slices.</p> </dd></dl> <dl class="function"> <dt id="string.lower"> <tt class="descclassname">string.</tt><tt class="descname">lower</tt><big>(</big><em>s</em><big>)</big><a class="headerlink" href="#string.lower" title="Permalink to this definition">¶</a></dt> <dd><p>Return a copy of <em>s</em>, but with upper case letters converted to lower case.</p> </dd></dl> <dl class="function"> <dt id="string.split"> <tt class="descclassname">string.</tt><tt class="descname">split</tt><big>(</big><em>s</em><span class="optional">[</span>, <em>sep</em><span class="optional">[</span>, <em>maxsplit</em><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#string.split" title="Permalink to this definition">¶</a></dt> <dd><p>Return a list of the words of the string <em>s</em>. If the optional second argument <em>sep</em> is absent or <tt class="docutils literal"><span class="pre">None</span></tt>, the words are separated by arbitrary strings of whitespace characters (space, tab, newline, return, formfeed). If the second argument <em>sep</em> is present and not <tt class="docutils literal"><span class="pre">None</span></tt>, it specifies a string to be used as the word separator. The returned list will then have one more item than the number of non-overlapping occurrences of the separator in the string. If <em>maxsplit</em> is given, at most <em>maxsplit</em> number of splits occur, and the remainder of the string is returned as the final element of the list (thus, the list will have at most <tt class="docutils literal"><span class="pre">maxsplit+1</span></tt> elements). If <em>maxsplit</em> is not specified or <tt class="docutils literal"><span class="pre">-1</span></tt>, then there is no limit on the number of splits (all possible splits are made).</p> <p>The behavior of split on an empty string depends on the value of <em>sep</em>. If <em>sep</em> is not specified, or specified as <tt class="docutils literal"><span class="pre">None</span></tt>, the result will be an empty list. If <em>sep</em> is specified as any string, the result will be a list containing one element which is an empty string.</p> </dd></dl> <dl class="function"> <dt id="string.rsplit"> <tt class="descclassname">string.</tt><tt class="descname">rsplit</tt><big>(</big><em>s</em><span class="optional">[</span>, <em>sep</em><span class="optional">[</span>, <em>maxsplit</em><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#string.rsplit" title="Permalink to this definition">¶</a></dt> <dd><p>Return a list of the words of the string <em>s</em>, scanning <em>s</em> from the end. To all intents and purposes, the resulting list of words is the same as returned by <a class="reference internal" href="#string.split" title="string.split"><tt class="xref py py-func docutils literal"><span class="pre">split()</span></tt></a>, except when the optional third argument <em>maxsplit</em> is explicitly specified and nonzero. If <em>maxsplit</em> is given, at most <em>maxsplit</em> number of splits – the <em>rightmost</em> ones – occur, and the remainder of the string is returned as the first element of the list (thus, the list will have at most <tt class="docutils literal"><span class="pre">maxsplit+1</span></tt> elements).</p> <p class="versionadded"> <span class="versionmodified">New in version 2.4.</span></p> </dd></dl> <dl class="function"> <dt id="string.splitfields"> <tt class="descclassname">string.</tt><tt class="descname">splitfields</tt><big>(</big><em>s</em><span class="optional">[</span>, <em>sep</em><span class="optional">[</span>, <em>maxsplit</em><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#string.splitfields" title="Permalink to this definition">¶</a></dt> <dd><p>This function behaves identically to <a class="reference internal" href="#string.split" title="string.split"><tt class="xref py py-func docutils literal"><span class="pre">split()</span></tt></a>. (In the past, <a class="reference internal" href="#string.split" title="string.split"><tt class="xref py py-func docutils literal"><span class="pre">split()</span></tt></a> was only used with one argument, while <a class="reference internal" href="#string.splitfields" title="string.splitfields"><tt class="xref py py-func docutils literal"><span class="pre">splitfields()</span></tt></a> was only used with two arguments.)</p> </dd></dl> <dl class="function"> <dt id="string.join"> <tt class="descclassname">string.</tt><tt class="descname">join</tt><big>(</big><em>words</em><span class="optional">[</span>, <em>sep</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#string.join" title="Permalink to this definition">¶</a></dt> <dd><p>Concatenate a list or tuple of words with intervening occurrences of <em>sep</em>. The default value for <em>sep</em> is a single space character. It is always true that <tt class="docutils literal"><span class="pre">string.join(string.split(s,</span> <span class="pre">sep),</span> <span class="pre">sep)</span></tt> equals <em>s</em>.</p> </dd></dl> <dl class="function"> <dt id="string.joinfields"> <tt class="descclassname">string.</tt><tt class="descname">joinfields</tt><big>(</big><em>words</em><span class="optional">[</span>, <em>sep</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#string.joinfields" title="Permalink to this definition">¶</a></dt> <dd><p>This function behaves identically to <a class="reference internal" href="#string.join" title="string.join"><tt class="xref py py-func docutils literal"><span class="pre">join()</span></tt></a>. (In the past, <a class="reference internal" href="#string.join" title="string.join"><tt class="xref py py-func docutils literal"><span class="pre">join()</span></tt></a> was only used with one argument, while <a class="reference internal" href="#string.joinfields" title="string.joinfields"><tt class="xref py py-func docutils literal"><span class="pre">joinfields()</span></tt></a> was only used with two arguments.) Note that there is no <a class="reference internal" href="#string.joinfields" title="string.joinfields"><tt class="xref py py-meth docutils literal"><span class="pre">joinfields()</span></tt></a> method on string objects; use the <a class="reference internal" href="#string.join" title="string.join"><tt class="xref py py-meth docutils literal"><span class="pre">join()</span></tt></a> method instead.</p> </dd></dl> <dl class="function"> <dt id="string.lstrip"> <tt class="descclassname">string.</tt><tt class="descname">lstrip</tt><big>(</big><em>s</em><span class="optional">[</span>, <em>chars</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#string.lstrip" title="Permalink to this definition">¶</a></dt> <dd><p>Return a copy of the string with leading characters removed. If <em>chars</em> is omitted or <tt class="docutils literal"><span class="pre">None</span></tt>, whitespace characters are removed. If given and not <tt class="docutils literal"><span class="pre">None</span></tt>, <em>chars</em> must be a string; the characters in the string will be stripped from the beginning of the string this method is called on.</p> <p class="versionchanged"> <span class="versionmodified">Changed in version 2.2.3: </span>The <em>chars</em> parameter was added. The <em>chars</em> parameter cannot be passed in earlier 2.2 versions.</p> </dd></dl> <dl class="function"> <dt id="string.rstrip"> <tt class="descclassname">string.</tt><tt class="descname">rstrip</tt><big>(</big><em>s</em><span class="optional">[</span>, <em>chars</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#string.rstrip" title="Permalink to this definition">¶</a></dt> <dd><p>Return a copy of the string with trailing characters removed. If <em>chars</em> is omitted or <tt class="docutils literal"><span class="pre">None</span></tt>, whitespace characters are removed. If given and not <tt class="docutils literal"><span class="pre">None</span></tt>, <em>chars</em> must be a string; the characters in the string will be stripped from the end of the string this method is called on.</p> <p class="versionchanged"> <span class="versionmodified">Changed in version 2.2.3: </span>The <em>chars</em> parameter was added. The <em>chars</em> parameter cannot be passed in earlier 2.2 versions.</p> </dd></dl> <dl class="function"> <dt id="string.strip"> <tt class="descclassname">string.</tt><tt class="descname">strip</tt><big>(</big><em>s</em><span class="optional">[</span>, <em>chars</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#string.strip" title="Permalink to this definition">¶</a></dt> <dd><p>Return a copy of the string with leading and trailing characters removed. If <em>chars</em> is omitted or <tt class="docutils literal"><span class="pre">None</span></tt>, whitespace characters are removed. If given and not <tt class="docutils literal"><span class="pre">None</span></tt>, <em>chars</em> must be a string; the characters in the string will be stripped from the both ends of the string this method is called on.</p> <p class="versionchanged"> <span class="versionmodified">Changed in version 2.2.3: </span>The <em>chars</em> parameter was added. The <em>chars</em> parameter cannot be passed in earlier 2.2 versions.</p> </dd></dl> <dl class="function"> <dt id="string.swapcase"> <tt class="descclassname">string.</tt><tt class="descname">swapcase</tt><big>(</big><em>s</em><big>)</big><a class="headerlink" href="#string.swapcase" title="Permalink to this definition">¶</a></dt> <dd><p>Return a copy of <em>s</em>, but with lower case letters converted to upper case and vice versa.</p> </dd></dl> <dl class="function"> <dt id="string.translate"> <tt class="descclassname">string.</tt><tt class="descname">translate</tt><big>(</big><em>s</em>, <em>table</em><span class="optional">[</span>, <em>deletechars</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#string.translate" title="Permalink to this definition">¶</a></dt> <dd><p>Delete all characters from <em>s</em> that are in <em>deletechars</em> (if present), and then translate the characters using <em>table</em>, which must be a 256-character string giving the translation for each character value, indexed by its ordinal. If <em>table</em> is <tt class="docutils literal"><span class="pre">None</span></tt>, then only the character deletion step is performed.</p> </dd></dl> <dl class="function"> <dt id="string.upper"> <tt class="descclassname">string.</tt><tt class="descname">upper</tt><big>(</big><em>s</em><big>)</big><a class="headerlink" href="#string.upper" title="Permalink to this definition">¶</a></dt> <dd><p>Return a copy of <em>s</em>, but with lower case letters converted to upper case.</p> </dd></dl> <dl class="function"> <dt id="string.ljust"> <tt class="descclassname">string.</tt><tt class="descname">ljust</tt><big>(</big><em>s</em>, <em>width</em><span class="optional">[</span>, <em>fillchar</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#string.ljust" title="Permalink to this definition">¶</a></dt> <dt id="string.rjust"> <tt class="descclassname">string.</tt><tt class="descname">rjust</tt><big>(</big><em>s</em>, <em>width</em><span class="optional">[</span>, <em>fillchar</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#string.rjust" title="Permalink to this definition">¶</a></dt> <dt id="string.center"> <tt class="descclassname">string.</tt><tt class="descname">center</tt><big>(</big><em>s</em>, <em>width</em><span class="optional">[</span>, <em>fillchar</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#string.center" title="Permalink to this definition">¶</a></dt> <dd><p>These functions respectively left-justify, right-justify and center a string in a field of given width. They return a string that is at least <em>width</em> characters wide, created by padding the string <em>s</em> with the character <em>fillchar</em> (default is a space) until the given width on the right, left or both sides. The string is never truncated.</p> </dd></dl> <dl class="function"> <dt id="string.zfill"> <tt class="descclassname">string.</tt><tt class="descname">zfill</tt><big>(</big><em>s</em>, <em>width</em><big>)</big><a class="headerlink" href="#string.zfill" title="Permalink to this definition">¶</a></dt> <dd><p>Pad a numeric string <em>s</em> on the left with zero digits until the given <em>width</em> is reached. Strings starting with a sign are handled correctly.</p> </dd></dl> <dl class="function"> <dt id="string.replace"> <tt class="descclassname">string.</tt><tt class="descname">replace</tt><big>(</big><em>s</em>, <em>old</em>, <em>new</em><span class="optional">[</span>, <em>maxreplace</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#string.replace" title="Permalink to this definition">¶</a></dt> <dd><p>Return a copy of string <em>s</em> with all occurrences of substring <em>old</em> replaced by <em>new</em>. If the optional argument <em>maxreplace</em> is given, the first <em>maxreplace</em> occurrences are replaced.</p> </dd></dl> </div> </div> </div> </div> </div> <div class="sphinxsidebar"> <div class="sphinxsidebarwrapper"> <h3><a href="../contents.html">Table Of Contents</a></h3> <ul> <li><a class="reference internal" href="#">7.1. <tt class="docutils literal"><span class="pre">string</span></tt> — Common string operations</a><ul> <li><a class="reference internal" href="#string-constants">7.1.1. String constants</a></li> <li><a class="reference internal" href="#string-formatting">7.1.2. String Formatting</a></li> <li><a class="reference internal" href="#format-string-syntax">7.1.3. Format String Syntax</a><ul> <li><a class="reference internal" href="#format-specification-mini-language">7.1.3.1. Format Specification Mini-Language</a></li> <li><a class="reference internal" href="#format-examples">7.1.3.2. Format examples</a></li> </ul> </li> <li><a class="reference internal" href="#template-strings">7.1.4. Template strings</a></li> <li><a class="reference internal" href="#string-functions">7.1.5. String functions</a></li> <li><a class="reference internal" href="#deprecated-string-functions">7.1.6. Deprecated string functions</a></li> </ul> </li> </ul> <h4>Previous topic</h4> <p class="topless"><a href="strings.html" title="previous chapter">7. String Services</a></p> <h4>Next topic</h4> <p class="topless"><a href="re.html" title="next chapter">7.2. <tt class="docutils literal"><span class="pre">re</span></tt> — Regular expression operations</a></p> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../bugs.html">Report a Bug</a></li> <li><a href="../_sources/library/string.txt" rel="nofollow">Show Source</a></li> </ul> <div id="searchbox" style="display: none"> <h3>Quick search</h3> <form class="search" action="../search.html" method="get"> <input type="text" name="q" /> <input type="submit" value="Go" /> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form> <p class="searchtip" style="font-size: 90%"> Enter search terms or a module, class or function name. </p> </div> <script type="text/javascript">$('#searchbox').show(0);</script> </div> </div> <div class="clearer"></div> </div> <div class="related"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" >index</a></li> <li class="right" > <a href="../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="re.html" title="7.2. re — Regular expression operations" >next</a> |</li> <li class="right" > <a href="strings.html" title="7. 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