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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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aetools.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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asyncore.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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binascii.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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copy_reg.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.ascii.html
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curses.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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debug.html
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decimal.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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docxmlrpcserver.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.errors.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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filesys.html
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fl.html
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fm.html
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fpectl.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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macos.html
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macosa.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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marshal.html
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math.html
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md5.html
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mhlib.html
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mimetools.html
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mimewriter.html
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mimify.html
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miniaeframe.html
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misc.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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multifile.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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parser.html
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pdb.html
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persistence.html
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pickle.html
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pipes.html
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pkgutil.html
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platform.html
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plistlib.html
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poplib.html
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pprint.html
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profile.html
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pwd.html
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py_compile.html
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pydoc.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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restricted.html
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rexec.html
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rfc822.html
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rlcompleter.html
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sched.html
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scrolledtext.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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shelve.html
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shutil.html
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signal.html
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site.html
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smtpd.html
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smtplib.html
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sndhdr.html
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socket.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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xmlrpclib.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>26.5. hotshot — High performance logging profiler — 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="26. 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Debugging and Profiling</a> »</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body"> <div class="section" id="module-hotshot"> <span id="hotshot-high-performance-logging-profiler"></span><h1>26.5. <a class="reference internal" href="#module-hotshot" title="hotshot: High performance logging profiler, mostly written in C."><tt class="xref py py-mod docutils literal"><span class="pre">hotshot</span></tt></a> — High performance logging profiler<a class="headerlink" href="#module-hotshot" title="Permalink to this headline">¶</a></h1> <p class="versionadded"> <span class="versionmodified">New in version 2.2.</span></p> <p>This module provides a nicer interface to the <tt class="xref py py-mod docutils literal"><span class="pre">_hotshot</span></tt> C module. Hotshot is a replacement for the existing <a class="reference internal" href="profile.html#module-profile" title="profile: Python source profiler."><tt class="xref py py-mod docutils literal"><span class="pre">profile</span></tt></a> module. As it’s written mostly in C, it should result in a much smaller performance impact than the existing <a class="reference internal" href="profile.html#module-profile" title="profile: Python source profiler."><tt class="xref py py-mod docutils literal"><span class="pre">profile</span></tt></a> module.</p> <div class="admonition note"> <p class="first admonition-title">Note</p> <p class="last">The <a class="reference internal" href="#module-hotshot" title="hotshot: High performance logging profiler, mostly written in C."><tt class="xref py py-mod docutils literal"><span class="pre">hotshot</span></tt></a> module focuses on minimizing the overhead while profiling, at the expense of long data post-processing times. For common usage it is recommended to use <a class="reference internal" href="profile.html#module-cProfile" title="cProfile"><tt class="xref py py-mod docutils literal"><span class="pre">cProfile</span></tt></a> instead. <a class="reference internal" href="#module-hotshot" title="hotshot: High performance logging profiler, mostly written in C."><tt class="xref py py-mod docutils literal"><span class="pre">hotshot</span></tt></a> is not maintained and might be removed from the standard library in the future.</p> </div> <p class="versionchanged"> <span class="versionmodified">Changed in version 2.5: </span>The results should be more meaningful than in the past: the timing core contained a critical bug.</p> <div class="admonition note"> <p class="first admonition-title">Note</p> <p class="last">The <a class="reference internal" href="#module-hotshot" title="hotshot: High performance logging profiler, mostly written in C."><tt class="xref py py-mod docutils literal"><span class="pre">hotshot</span></tt></a> profiler does not yet work well with threads. It is useful to use an unthreaded script to run the profiler over the code you’re interested in measuring if at all possible.</p> </div> <dl class="class"> <dt id="hotshot.Profile"> <em class="property">class </em><tt class="descclassname">hotshot.</tt><tt class="descname">Profile</tt><big>(</big><em>logfile</em><span class="optional">[</span>, <em>lineevents</em><span class="optional">[</span>, <em>linetimings</em><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#hotshot.Profile" title="Permalink to this definition">¶</a></dt> <dd><p>The profiler object. The argument <em>logfile</em> is the name of a log file to use for logged profile data. The argument <em>lineevents</em> specifies whether to generate events for every source line, or just on function call/return. It defaults to <tt class="docutils literal"><span class="pre">0</span></tt> (only log function call/return). The argument <em>linetimings</em> specifies whether to record timing information. It defaults to <tt class="docutils literal"><span class="pre">1</span></tt> (store timing information).</p> </dd></dl> <div class="section" id="profile-objects"> <span id="hotshot-objects"></span><h2>26.5.1. Profile Objects<a class="headerlink" href="#profile-objects" title="Permalink to this headline">¶</a></h2> <p>Profile objects have the following methods:</p> <dl class="method"> <dt id="hotshot.Profile.addinfo"> <tt class="descclassname">Profile.</tt><tt class="descname">addinfo</tt><big>(</big><em>key</em>, <em>value</em><big>)</big><a class="headerlink" href="#hotshot.Profile.addinfo" title="Permalink to this definition">¶</a></dt> <dd><p>Add an arbitrary labelled value to the profile output.</p> </dd></dl> <dl class="method"> <dt id="hotshot.Profile.close"> <tt class="descclassname">Profile.</tt><tt class="descname">close</tt><big>(</big><big>)</big><a class="headerlink" href="#hotshot.Profile.close" title="Permalink to this definition">¶</a></dt> <dd><p>Close the logfile and terminate the profiler.</p> </dd></dl> <dl class="method"> <dt id="hotshot.Profile.fileno"> <tt class="descclassname">Profile.</tt><tt class="descname">fileno</tt><big>(</big><big>)</big><a class="headerlink" href="#hotshot.Profile.fileno" title="Permalink to this definition">¶</a></dt> <dd><p>Return the file descriptor of the profiler’s log file.</p> </dd></dl> <dl class="method"> <dt id="hotshot.Profile.run"> <tt class="descclassname">Profile.</tt><tt class="descname">run</tt><big>(</big><em>cmd</em><big>)</big><a class="headerlink" href="#hotshot.Profile.run" title="Permalink to this definition">¶</a></dt> <dd><p>Profile an <a class="reference internal" href="../reference/simple_stmts.html#exec"><tt class="xref std std-keyword docutils literal"><span class="pre">exec</span></tt></a>-compatible string in the script environment. The globals from the <a class="reference internal" href="__main__.html#module-__main__" title="__main__: The environment where the top-level script is run."><tt class="xref py py-mod docutils literal"><span class="pre">__main__</span></tt></a> module are used as both the globals and locals for the script.</p> </dd></dl> <dl class="method"> <dt id="hotshot.Profile.runcall"> <tt class="descclassname">Profile.</tt><tt class="descname">runcall</tt><big>(</big><em>func</em>, <em>*args</em>, <em>**keywords</em><big>)</big><a class="headerlink" href="#hotshot.Profile.runcall" title="Permalink to this definition">¶</a></dt> <dd><p>Profile a single call of a callable. Additional positional and keyword arguments may be passed along; the result of the call is returned, and exceptions are allowed to propagate cleanly, while ensuring that profiling is disabled on the way out.</p> </dd></dl> <dl class="method"> <dt id="hotshot.Profile.runctx"> <tt class="descclassname">Profile.</tt><tt class="descname">runctx</tt><big>(</big><em>cmd</em>, <em>globals</em>, <em>locals</em><big>)</big><a class="headerlink" href="#hotshot.Profile.runctx" title="Permalink to this definition">¶</a></dt> <dd><p>Evaluate an <a class="reference internal" href="../reference/simple_stmts.html#exec"><tt class="xref std std-keyword docutils literal"><span class="pre">exec</span></tt></a>-compatible string in a specific environment. The string is compiled before profiling begins.</p> </dd></dl> <dl class="method"> <dt id="hotshot.Profile.start"> <tt class="descclassname">Profile.</tt><tt class="descname">start</tt><big>(</big><big>)</big><a class="headerlink" href="#hotshot.Profile.start" title="Permalink to this definition">¶</a></dt> <dd><p>Start the profiler.</p> </dd></dl> <dl class="method"> <dt id="hotshot.Profile.stop"> <tt class="descclassname">Profile.</tt><tt class="descname">stop</tt><big>(</big><big>)</big><a class="headerlink" href="#hotshot.Profile.stop" title="Permalink to this definition">¶</a></dt> <dd><p>Stop the profiler.</p> </dd></dl> </div> <div class="section" id="module-hotshot.stats"> <span id="using-hotshot-data"></span><h2>26.5.2. Using hotshot data<a class="headerlink" href="#module-hotshot.stats" title="Permalink to this headline">¶</a></h2> <p class="versionadded"> <span class="versionmodified">New in version 2.2.</span></p> <p>This module loads hotshot profiling data into the standard <a class="reference internal" href="profile.html#module-pstats" title="pstats: Statistics object for use with the profiler."><tt class="xref py py-mod docutils literal"><span class="pre">pstats</span></tt></a> Stats objects.</p> <dl class="function"> <dt id="hotshot.stats.load"> <tt class="descclassname">hotshot.stats.</tt><tt class="descname">load</tt><big>(</big><em>filename</em><big>)</big><a class="headerlink" href="#hotshot.stats.load" title="Permalink to this definition">¶</a></dt> <dd><p>Load hotshot data from <em>filename</em>. Returns an instance of the <a class="reference internal" href="profile.html#pstats.Stats" title="pstats.Stats"><tt class="xref py py-class docutils literal"><span class="pre">pstats.Stats</span></tt></a> class.</p> </dd></dl> <div class="admonition-see-also admonition seealso"> <p class="first admonition-title">See also</p> <dl class="last docutils"> <dt>Module <a class="reference internal" href="profile.html#module-profile" title="profile: Python source profiler."><tt class="xref py py-mod docutils literal"><span class="pre">profile</span></tt></a></dt> <dd>The <a class="reference internal" href="profile.html#module-profile" title="profile: Python source profiler."><tt class="xref py py-mod docutils literal"><span class="pre">profile</span></tt></a> module’s <tt class="xref py py-class docutils literal"><span class="pre">Stats</span></tt> class</dd> </dl> </div> </div> <div class="section" id="example-usage"> <span id="hotshot-example"></span><h2>26.5.3. Example Usage<a class="headerlink" href="#example-usage" title="Permalink to this headline">¶</a></h2> <p>Note that this example runs the Python “benchmark” pystones. It can take some time to run, and will produce large output files.</p> <div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">hotshot</span><span class="o">,</span> <span class="nn">hotshot.stats</span><span class="o">,</span> <span class="nn">test.pystone</span> <span class="gp">>>> </span><span class="n">prof</span> <span class="o">=</span> <span class="n">hotshot</span><span class="o">.</span><span class="n">Profile</span><span class="p">(</span><span class="s">"stones.prof"</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">benchtime</span><span class="p">,</span> <span class="n">stones</span> <span class="o">=</span> <span class="n">prof</span><span class="o">.</span><span class="n">runcall</span><span class="p">(</span><span class="n">test</span><span class="o">.</span><span class="n">pystone</span><span class="o">.</span><span class="n">pystones</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">prof</span><span class="o">.</span><span class="n">close</span><span class="p">()</span> <span class="gp">>>> </span><span class="n">stats</span> <span class="o">=</span> <span class="n">hotshot</span><span class="o">.</span><span class="n">stats</span><span class="o">.</span><span class="n">load</span><span class="p">(</span><span class="s">"stones.prof"</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">stats</span><span class="o">.</span><span class="n">strip_dirs</span><span class="p">()</span> <span class="gp">>>> </span><span class="n">stats</span><span class="o">.</span><span class="n">sort_stats</span><span class="p">(</span><span class="s">'time'</span><span class="p">,</span> <span class="s">'calls'</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">stats</span><span class="o">.</span><span class="n">print_stats</span><span class="p">(</span><span class="mi">20</span><span class="p">)</span> <span class="go"> 850004 function calls in 10.090 CPU seconds</span> <span class="go"> Ordered by: internal time, call count</span> <span class="go"> ncalls tottime percall cumtime percall filename:lineno(function)</span> <span class="go"> 1 3.295 3.295 10.090 10.090 pystone.py:79(Proc0)</span> <span class="go"> 150000 1.315 0.000 1.315 0.000 pystone.py:203(Proc7)</span> <span class="go"> 50000 1.313 0.000 1.463 0.000 pystone.py:229(Func2)</span> <span class="go"> .</span> <span class="go"> .</span> <span class="go"> .</span> </pre></div> </div> </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="#">26.5. <tt class="docutils literal"><span class="pre">hotshot</span></tt> — High performance logging profiler</a><ul> <li><a class="reference internal" href="#profile-objects">26.5.1. Profile Objects</a></li> <li><a class="reference internal" href="#module-hotshot.stats">26.5.2. Using hotshot data</a></li> <li><a class="reference internal" href="#example-usage">26.5.3. Example Usage</a></li> </ul> </li> </ul> <h4>Previous topic</h4> <p class="topless"><a href="profile.html" title="previous chapter">26.4. The Python Profilers</a></p> <h4>Next topic</h4> <p class="topless"><a href="timeit.html" title="next chapter">26.6. <tt class="docutils literal"><span class="pre">timeit</span></tt> — Measure execution time of small code snippets</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/hotshot.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="timeit.html" title="26.6. timeit — Measure execution time of small code snippets" >next</a> |</li> <li class="right" > <a href="profile.html" title="26.4. 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