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2to3.html
49.27
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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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aepack.html
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aetools.html
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aetypes.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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asynchat.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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base64.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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dl.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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email.util.html
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errno.html
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exceptions.html
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fcntl.html
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filesys.html
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fl.html
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fm.html
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formatter.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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pyclbr.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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repr.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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robotparser.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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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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stringprep.html
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strings.html
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struct.html
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threading.html
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tix.html
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tk.html
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tkinter.html
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tokenize.html
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trace.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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user.html
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uuid.html
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warnings.html
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whichdb.html
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windows.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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Debugging and Profiling</a> »</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body"> <div class="section" id="module-trace"> <span id="trace-trace-or-track-python-statement-execution"></span><h1>26.7. <a class="reference internal" href="#module-trace" title="trace: Trace or track Python statement execution."><tt class="xref py py-mod docutils literal"><span class="pre">trace</span></tt></a> — Trace or track Python statement execution<a class="headerlink" href="#module-trace" title="Permalink to this headline">¶</a></h1> <p><strong>Source code:</strong> <a class="reference external" href="http://hg.python.org/cpython/file/2.7/Lib/trace.py">Lib/trace.py</a></p> <hr class="docutils" /> <p>The <a class="reference internal" href="#module-trace" title="trace: Trace or track Python statement execution."><tt class="xref py py-mod docutils literal"><span class="pre">trace</span></tt></a> module allows you to trace program execution, generate annotated statement coverage listings, print caller/callee relationships and list functions executed during a program run. It can be used in another program or from the command line.</p> <div class="section" id="command-line-usage"> <span id="trace-cli"></span><h2>26.7.1. Command-Line Usage<a class="headerlink" href="#command-line-usage" title="Permalink to this headline">¶</a></h2> <p>The <a class="reference internal" href="#module-trace" title="trace: Trace or track Python statement execution."><tt class="xref py py-mod docutils literal"><span class="pre">trace</span></tt></a> module can be invoked from the command line. It can be as simple as</p> <div class="highlight-python"><pre>python -m trace --count -C . somefile.py ...</pre> </div> <p>The above will execute <tt class="file docutils literal"><span class="pre">somefile.py</span></tt> and generate annotated listings of all Python modules imported during the execution into the current directory.</p> <dl class="cmdoption"> <dt id="cmdoption-trace--help"> <tt class="descname">--help</tt><tt class="descclassname"></tt><a class="headerlink" href="#cmdoption-trace--help" title="Permalink to this definition">¶</a></dt> <dd><p>Display usage and exit.</p> </dd></dl> <dl class="cmdoption"> <dt id="cmdoption-trace--version"> <tt class="descname">--version</tt><tt class="descclassname"></tt><a class="headerlink" href="#cmdoption-trace--version" title="Permalink to this definition">¶</a></dt> <dd><p>Display the version of the module and exit.</p> </dd></dl> <div class="section" id="main-options"> <h3>26.7.1.1. Main options<a class="headerlink" href="#main-options" title="Permalink to this headline">¶</a></h3> <p>At least one of the following options must be specified when invoking <a class="reference internal" href="#module-trace" title="trace: Trace or track Python statement execution."><tt class="xref py py-mod docutils literal"><span class="pre">trace</span></tt></a>. The <a class="reference internal" href="#cmdoption-trace-l"><em class="xref std std-option">--listfuncs</em></a> option is mutually exclusive with the <a class="reference internal" href="#cmdoption-trace-t"><em class="xref std std-option">--trace</em></a> and <a class="reference internal" href="#cmdoption-trace-c"><em class="xref std std-option">--counts</em></a> options . When <a class="reference internal" href="#cmdoption-trace-l"><em class="xref std std-option">--listfuncs</em></a> is provided, neither <a class="reference internal" href="#cmdoption-trace-c"><em class="xref std std-option">--counts</em></a> nor <a class="reference internal" href="#cmdoption-trace-t"><em class="xref std std-option">--trace</em></a> are accepted, and vice versa.</p> <dl class="cmdoption"> <dt id="cmdoption-trace-c"> <tt class="descname">-c</tt><tt class="descclassname"></tt><tt class="descclassname">, </tt><tt class="descname">--count</tt><tt class="descclassname"></tt><a class="headerlink" href="#cmdoption-trace-c" title="Permalink to this definition">¶</a></dt> <dd><p>Produce a set of annotated listing files upon program completion that shows how many times each statement was executed. See also <a class="reference internal" href="#cmdoption-trace-C"><em class="xref std std-option">--coverdir</em></a>, <a class="reference internal" href="#cmdoption-trace-f"><em class="xref std std-option">--file</em></a> and <a class="reference internal" href="#cmdoption-trace-R"><em class="xref std std-option">--no-report</em></a> below.</p> </dd></dl> <dl class="cmdoption"> <dt id="cmdoption-trace-t"> <tt class="descname">-t</tt><tt class="descclassname"></tt><tt class="descclassname">, </tt><tt class="descname">--trace</tt><tt class="descclassname"></tt><a class="headerlink" href="#cmdoption-trace-t" title="Permalink to this definition">¶</a></dt> <dd><p>Display lines as they are executed.</p> </dd></dl> <dl class="cmdoption"> <dt id="cmdoption-trace-l"> <tt class="descname">-l</tt><tt class="descclassname"></tt><tt class="descclassname">, </tt><tt class="descname">--listfuncs</tt><tt class="descclassname"></tt><a class="headerlink" href="#cmdoption-trace-l" title="Permalink to this definition">¶</a></dt> <dd><p>Display the functions executed by running the program.</p> </dd></dl> <dl class="cmdoption"> <dt id="cmdoption-trace-r"> <tt class="descname">-r</tt><tt class="descclassname"></tt><tt class="descclassname">, </tt><tt class="descname">--report</tt><tt class="descclassname"></tt><a class="headerlink" href="#cmdoption-trace-r" title="Permalink to this definition">¶</a></dt> <dd><p>Produce an annotated list from an earlier program run that used the <a class="reference internal" href="#cmdoption-trace-c"><em class="xref std std-option">--count</em></a> and <a class="reference internal" href="#cmdoption-trace-f"><em class="xref std std-option">--file</em></a> option. This does not execute any code.</p> </dd></dl> <dl class="cmdoption"> <dt id="cmdoption-trace-T"> <tt class="descname">-T</tt><tt class="descclassname"></tt><tt class="descclassname">, </tt><tt class="descname">--trackcalls</tt><tt class="descclassname"></tt><a class="headerlink" href="#cmdoption-trace-T" title="Permalink to this definition">¶</a></dt> <dd><p>Display the calling relationships exposed by running the program.</p> </dd></dl> </div> <div class="section" id="modifiers"> <h3>26.7.1.2. Modifiers<a class="headerlink" href="#modifiers" title="Permalink to this headline">¶</a></h3> <dl class="cmdoption"> <dt id="cmdoption-trace-f"> <tt class="descname">-f</tt><tt class="descclassname"></tt><tt class="descclassname">, </tt><tt class="descname">--file</tt><tt class="descclassname">=<file></tt><a class="headerlink" href="#cmdoption-trace-f" title="Permalink to this definition">¶</a></dt> <dd><p>Name of a file to accumulate counts over several tracing runs. Should be used with the <a class="reference internal" href="#cmdoption-trace-c"><em class="xref std std-option">--count</em></a> option.</p> </dd></dl> <dl class="cmdoption"> <dt id="cmdoption-trace-C"> <tt class="descname">-C</tt><tt class="descclassname"></tt><tt class="descclassname">, </tt><tt class="descname">--coverdir</tt><tt class="descclassname">=<dir></tt><a class="headerlink" href="#cmdoption-trace-C" title="Permalink to this definition">¶</a></dt> <dd><p>Directory where the report files go. The coverage report for <tt class="docutils literal"><span class="pre">package.module</span></tt> is written to file <tt class="file docutils literal"><em><span class="pre">dir</span></em><span class="pre">/</span><em><span class="pre">package</span></em><span class="pre">/</span><em><span class="pre">module</span></em><span class="pre">.cover</span></tt>.</p> </dd></dl> <dl class="cmdoption"> <dt id="cmdoption-trace-m"> <tt class="descname">-m</tt><tt class="descclassname"></tt><tt class="descclassname">, </tt><tt class="descname">--missing</tt><tt class="descclassname"></tt><a class="headerlink" href="#cmdoption-trace-m" title="Permalink to this definition">¶</a></dt> <dd><p>When generating annotated listings, mark lines which were not executed with <tt class="docutils literal"><span class="pre">>>>>>></span></tt>.</p> </dd></dl> <dl class="cmdoption"> <dt id="cmdoption-trace-s"> <tt class="descname">-s</tt><tt class="descclassname"></tt><tt class="descclassname">, </tt><tt class="descname">--summary</tt><tt class="descclassname"></tt><a class="headerlink" href="#cmdoption-trace-s" title="Permalink to this definition">¶</a></dt> <dd><p>When using <a class="reference internal" href="#cmdoption-trace-c"><em class="xref std std-option">--count</em></a> or <a class="reference internal" href="#cmdoption-trace-r"><em class="xref std std-option">--report</em></a>, write a brief summary to stdout for each file processed.</p> </dd></dl> <dl class="cmdoption"> <dt id="cmdoption-trace-R"> <tt class="descname">-R</tt><tt class="descclassname"></tt><tt class="descclassname">, </tt><tt class="descname">--no-report</tt><tt class="descclassname"></tt><a class="headerlink" href="#cmdoption-trace-R" title="Permalink to this definition">¶</a></dt> <dd><p>Do not generate annotated listings. This is useful if you intend to make several runs with <a class="reference internal" href="#cmdoption-trace-c"><em class="xref std std-option">--count</em></a>, and then produce a single set of annotated listings at the end.</p> </dd></dl> <dl class="cmdoption"> <dt id="cmdoption-trace-g"> <tt class="descname">-g</tt><tt class="descclassname"></tt><tt class="descclassname">, </tt><tt class="descname">--timing</tt><tt class="descclassname"></tt><a class="headerlink" href="#cmdoption-trace-g" title="Permalink to this definition">¶</a></dt> <dd><p>Prefix each line with the time since the program started. Only used while tracing.</p> </dd></dl> </div> <div class="section" id="filters"> <h3>26.7.1.3. Filters<a class="headerlink" href="#filters" title="Permalink to this headline">¶</a></h3> <p>These options may be repeated multiple times.</p> <dl class="cmdoption"> <dt id="cmdoption-trace--ignore-module"> <tt class="descname">--ignore-module</tt><tt class="descclassname">=<mod></tt><a class="headerlink" href="#cmdoption-trace--ignore-module" title="Permalink to this definition">¶</a></dt> <dd><p>Ignore each of the given module names and its submodules (if it is a package). The argument can be a list of names separated by a comma.</p> </dd></dl> <dl class="cmdoption"> <dt id="cmdoption-trace--ignore-dir"> <tt class="descname">--ignore-dir</tt><tt class="descclassname">=<dir></tt><a class="headerlink" href="#cmdoption-trace--ignore-dir" title="Permalink to this definition">¶</a></dt> <dd><p>Ignore all modules and packages in the named directory and subdirectories. The argument can be a list of directories separated by <a class="reference internal" href="os.html#os.pathsep" title="os.pathsep"><tt class="xref py py-data docutils literal"><span class="pre">os.pathsep</span></tt></a>.</p> </dd></dl> </div> </div> <div class="section" id="programmatic-interface"> <span id="trace-api"></span><h2>26.7.2. Programmatic Interface<a class="headerlink" href="#programmatic-interface" title="Permalink to this headline">¶</a></h2> <dl class="class"> <dt id="trace.Trace"> <em class="property">class </em><tt class="descclassname">trace.</tt><tt class="descname">Trace</tt><big>(</big><span class="optional">[</span><em>count=1</em><span class="optional">[</span>, <em>trace=1</em><span class="optional">[</span>, <em>countfuncs=0</em><span class="optional">[</span>, <em>countcallers=0</em><span class="optional">[</span>, <em>ignoremods=()</em><span class="optional">[</span>, <em>ignoredirs=()</em><span class="optional">[</span>, <em>infile=None</em><span class="optional">[</span>, <em>outfile=None</em><span class="optional">[</span>, <em>timing=False</em><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#trace.Trace" title="Permalink to this definition">¶</a></dt> <dd><p>Create an object to trace execution of a single statement or expression. All parameters are optional. <em>count</em> enables counting of line numbers. <em>trace</em> enables line execution tracing. <em>countfuncs</em> enables listing of the functions called during the run. <em>countcallers</em> enables call relationship tracking. <em>ignoremods</em> is a list of modules or packages to ignore. <em>ignoredirs</em> is a list of directories whose modules or packages should be ignored. <em>infile</em> is the name of the file from which to read stored count information. <em>outfile</em> is the name of the file in which to write updated count information. <em>timing</em> enables a timestamp relative to when tracing was started to be displayed.</p> <blockquote> <div><dl class="method"> <dt id="trace.Trace.run"> <tt class="descname">run</tt><big>(</big><em>cmd</em><big>)</big><a class="headerlink" href="#trace.Trace.run" title="Permalink to this definition">¶</a></dt> <dd><p>Execute the command and gather statistics from the execution with the current tracing parameters. <em>cmd</em> must be a string or code object, suitable for passing into <tt class="xref py py-func docutils literal"><span class="pre">exec()</span></tt>.</p> </dd></dl> <dl class="method"> <dt id="trace.Trace.runctx"> <tt class="descname">runctx</tt><big>(</big><em>cmd</em>, <em>globals=None</em>, <em>locals=None</em><big>)</big><a class="headerlink" href="#trace.Trace.runctx" title="Permalink to this definition">¶</a></dt> <dd><p>Execute the command and gather statistics from the execution with the current tracing parameters, in the defined global and local environments. If not defined, <em>globals</em> and <em>locals</em> default to empty dictionaries.</p> </dd></dl> <dl class="method"> <dt id="trace.Trace.runfunc"> <tt class="descname">runfunc</tt><big>(</big><em>func</em>, <em>*args</em>, <em>**kwds</em><big>)</big><a class="headerlink" href="#trace.Trace.runfunc" title="Permalink to this definition">¶</a></dt> <dd><p>Call <em>func</em> with the given arguments under control of the <a class="reference internal" href="#trace.Trace" title="trace.Trace"><tt class="xref py py-class docutils literal"><span class="pre">Trace</span></tt></a> object with the current tracing parameters.</p> </dd></dl> <dl class="method"> <dt id="trace.Trace.results"> <tt class="descname">results</tt><big>(</big><big>)</big><a class="headerlink" href="#trace.Trace.results" title="Permalink to this definition">¶</a></dt> <dd><p>Return a <a class="reference internal" href="#trace.CoverageResults" title="trace.CoverageResults"><tt class="xref py py-class docutils literal"><span class="pre">CoverageResults</span></tt></a> object that contains the cumulative results of all previous calls to <tt class="docutils literal"><span class="pre">run</span></tt>, <tt class="docutils literal"><span class="pre">runctx</span></tt> and <tt class="docutils literal"><span class="pre">runfunc</span></tt> for the given <a class="reference internal" href="#trace.Trace" title="trace.Trace"><tt class="xref py py-class docutils literal"><span class="pre">Trace</span></tt></a> instance. Does not reset the accumulated trace results.</p> </dd></dl> </div></blockquote> </dd></dl> <dl class="class"> <dt id="trace.CoverageResults"> <em class="property">class </em><tt class="descclassname">trace.</tt><tt class="descname">CoverageResults</tt><a class="headerlink" href="#trace.CoverageResults" title="Permalink to this definition">¶</a></dt> <dd><p>A container for coverage results, created by <a class="reference internal" href="#trace.Trace.results" title="trace.Trace.results"><tt class="xref py py-meth docutils literal"><span class="pre">Trace.results()</span></tt></a>. Should not be created directly by the user.</p> <blockquote> <div><dl class="method"> <dt id="trace.CoverageResults.update"> <tt class="descname">update</tt><big>(</big><em>other</em><big>)</big><a class="headerlink" href="#trace.CoverageResults.update" title="Permalink to this definition">¶</a></dt> <dd><p>Merge in data from another <a class="reference internal" href="#trace.CoverageResults" title="trace.CoverageResults"><tt class="xref py py-class docutils literal"><span class="pre">CoverageResults</span></tt></a> object.</p> </dd></dl> <dl class="method"> <dt id="trace.CoverageResults.write_results"> <tt class="descname">write_results</tt><big>(</big><span class="optional">[</span><em>show_missing=True</em><span class="optional">[</span>, <em>summary=False</em><span class="optional">[</span>, <em>coverdir=None</em><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#trace.CoverageResults.write_results" title="Permalink to this definition">¶</a></dt> <dd><p>Write coverage results. Set <em>show_missing</em> to show lines that had no hits. Set <em>summary</em> to include in the output the coverage summary per module. <em>coverdir</em> specifies the directory into which the coverage result files will be output. If <tt class="docutils literal"><span class="pre">None</span></tt>, the results for each source file are placed in its directory.</p> </dd></dl> </div></blockquote> </dd></dl> <p>A simple example demonstrating the use of the programmatic interface:</p> <div class="highlight-python"><div class="highlight"><pre><span class="kn">import</span> <span class="nn">sys</span> <span class="kn">import</span> <span class="nn">trace</span> <span class="c"># create a Trace object, telling it what to ignore, and whether to</span> <span class="c"># do tracing or line-counting or both.</span> <span class="n">tracer</span> <span class="o">=</span> <span class="n">trace</span><span class="o">.</span><span class="n">Trace</span><span class="p">(</span> <span class="n">ignoredirs</span><span class="o">=</span><span class="p">[</span><span class="n">sys</span><span class="o">.</span><span class="n">prefix</span><span class="p">,</span> <span class="n">sys</span><span class="o">.</span><span class="n">exec_prefix</span><span class="p">],</span> <span class="n">trace</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span> <span class="n">count</span><span class="o">=</span><span class="mi">1</span><span class="p">)</span> <span class="c"># run the new command using the given tracer</span> <span class="n">tracer</span><span class="o">.</span><span class="n">run</span><span class="p">(</span><span class="s">'main()'</span><span class="p">)</span> <span class="c"># make a report, placing output in the current directory</span> <span class="n">r</span> <span class="o">=</span> <span class="n">tracer</span><span class="o">.</span><span class="n">results</span><span class="p">()</span> <span class="n">r</span><span class="o">.</span><span class="n">write_results</span><span class="p">(</span><span class="n">show_missing</span><span class="o">=</span><span class="bp">True</span><span class="p">,</span> <span class="n">coverdir</span><span class="o">=</span><span class="s">"."</span><span class="p">)</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="#">26.7. <tt class="docutils literal"><span class="pre">trace</span></tt> — Trace or track Python statement execution</a><ul> <li><a class="reference internal" href="#command-line-usage">26.7.1. Command-Line Usage</a><ul> <li><a class="reference internal" href="#main-options">26.7.1.1. Main options</a></li> <li><a class="reference internal" href="#modifiers">26.7.1.2. Modifiers</a></li> <li><a class="reference internal" href="#filters">26.7.1.3. Filters</a></li> </ul> </li> <li><a class="reference internal" href="#programmatic-interface">26.7.2. Programmatic Interface</a></li> </ul> </li> </ul> <h4>Previous topic</h4> <p class="topless"><a href="timeit.html" title="previous chapter">26.6. <tt class="docutils literal"><span class="pre">timeit</span></tt> — Measure execution time of small code snippets</a></p> <h4>Next topic</h4> <p class="topless"><a href="python.html" title="next chapter">27. 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