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2to3.rst.txt
14.3
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__builtin__.rst.txt
1.46
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__future__.rst.txt
4.84
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__main__.rst.txt
535
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_winreg.rst.txt
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abc.rst.txt
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aepack.rst.txt
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aetools.rst.txt
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aetypes.rst.txt
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aifc.rst.txt
6.92
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al.rst.txt
5.18
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allos.rst.txt
695
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anydbm.rst.txt
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archiving.rst.txt
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argparse.rst.txt
72.93
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array.rst.txt
10.28
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ast.rst.txt
10.23
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asynchat.rst.txt
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asyncore.rst.txt
12.63
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atexit.rst.txt
3.82
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audioop.rst.txt
10.15
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autogil.rst.txt
1015
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base64.rst.txt
6.11
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basehttpserver.rst.txt
10.16
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bastion.rst.txt
2.55
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bdb.rst.txt
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binascii.rst.txt
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binhex.rst.txt
1.87
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bisect.rst.txt
5.29
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bsddb.rst.txt
7.4
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bz2.rst.txt
7.88
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calendar.rst.txt
11.02
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carbon.rst.txt
15.58
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cd.rst.txt
11.69
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cgi.rst.txt
22.32
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cgihttpserver.rst.txt
2.72
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cgitb.rst.txt
2.81
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chunk.rst.txt
4.84
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cmath.rst.txt
7.47
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cmd.rst.txt
8.36
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code.rst.txt
6.95
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codecs.rst.txt
65.4
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codeop.rst.txt
3.69
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collections.rst.txt
40.48
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colorpicker.rst.txt
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colorsys.rst.txt
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commands.rst.txt
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compileall.rst.txt
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compiler.rst.txt
36.59
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configparser.rst.txt
19.15
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constants.rst.txt
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contextlib.rst.txt
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cookie.rst.txt
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cookielib.rst.txt
27.22
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copy.rst.txt
3.27
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copy_reg.rst.txt
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crypt.rst.txt
2.24
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crypto.rst.txt
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csv.rst.txt
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ctypes.rst.txt
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curses.ascii.rst.txt
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curses.panel.rst.txt
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curses.rst.txt
73.12
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custominterp.rst.txt
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datatypes.rst.txt
864
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datetime.rst.txt
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dbhash.rst.txt
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dbm.rst.txt
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debug.rst.txt
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decimal.rst.txt
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development.rst.txt
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difflib.rst.txt
30
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dircache.rst.txt
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dis.rst.txt
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distribution.rst.txt
426
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distutils.rst.txt
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dl.rst.txt
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doctest.rst.txt
72.25
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docxmlrpcserver.rst.txt
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dumbdbm.rst.txt
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dummy_thread.rst.txt
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dummy_threading.rst.txt
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easydialogs.rst.txt
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email-examples.rst.txt
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email.charset.rst.txt
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email.encoders.rst.txt
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email.errors.rst.txt
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email.generator.rst.txt
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email.header.rst.txt
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email.iterators.rst.txt
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email.message.rst.txt
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email.mime.rst.txt
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email.parser.rst.txt
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email.rst.txt
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email.utils.rst.txt
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ensurepip.rst.txt
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errno.rst.txt
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exceptions.rst.txt
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fcntl.rst.txt
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filecmp.rst.txt
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fileformats.rst.txt
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fileinput.rst.txt
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filesys.rst.txt
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fl.rst.txt
17.23
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fm.rst.txt
2.64
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fnmatch.rst.txt
3.03
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formatter.rst.txt
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fpectl.rst.txt
4.07
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fpformat.rst.txt
1.71
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fractions.rst.txt
5.17
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framework.rst.txt
11.18
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frameworks.rst.txt
378
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ftplib.rst.txt
15.35
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functions.rst.txt
73.75
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functools.rst.txt
7.27
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future_builtins.rst.txt
1.96
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gc.rst.txt
8.8
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gdbm.rst.txt
4.77
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gensuitemodule.rst.txt
3.04
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getopt.rst.txt
6.51
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getpass.rst.txt
1.83
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gettext.rst.txt
28.36
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gl.rst.txt
5.87
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glob.rst.txt
2.36
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grp.rst.txt
2.2
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gzip.rst.txt
4.71
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hashlib.rst.txt
7.21
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heapq.rst.txt
12.88
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hmac.rst.txt
3
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hotshot.rst.txt
4.19
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htmllib.rst.txt
7.21
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htmlparser.rst.txt
11.37
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httplib.rst.txt
36.58
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i18n.rst.txt
409
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ic.rst.txt
4.89
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idle.rst.txt
21.66
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imageop.rst.txt
3.91
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imaplib.rst.txt
16.82
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imgfile.rst.txt
2.7
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imghdr.rst.txt
2.57
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imp.rst.txt
12.3
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importlib.rst.txt
1.1
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imputil.rst.txt
6.86
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index.rst.txt
2.23
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inspect.rst.txt
27.49
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internet.rst.txt
950
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intro.rst.txt
2.74
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io.rst.txt
38.11
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ipc.rst.txt
630
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itertools.rst.txt
35.67
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jpeg.rst.txt
3.77
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json.rst.txt
24.95
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keyword.rst.txt
617
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language.rst.txt
523
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linecache.rst.txt
1.84
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locale.rst.txt
24.39
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logging.config.rst.txt
30.82
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logging.handlers.rst.txt
27.49
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logging.rst.txt
45.78
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mac.rst.txt
791
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macos.rst.txt
3.73
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macosa.rst.txt
3.87
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macostools.rst.txt
3.92
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macpath.rst.txt
650
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mailbox.rst.txt
66.53
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mailcap.rst.txt
3.59
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markup.rst.txt
1.22
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marshal.rst.txt
5.56
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math.rst.txt
10.66
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md5.rst.txt
2.75
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mhlib.rst.txt
3.87
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mimetools.rst.txt
4.4
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mimetypes.rst.txt
9.61
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mimewriter.rst.txt
3.28
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mimify.rst.txt
3.44
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miniaeframe.rst.txt
2.5
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misc.rst.txt
248
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mm.rst.txt
447
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mmap.rst.txt
10.24
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modulefinder.rst.txt
3.3
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modules.rst.txt
382
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msilib.rst.txt
18.62
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msvcrt.rst.txt
4.24
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multifile.rst.txt
6.46
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multiprocessing.rst.txt
90.45
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mutex.rst.txt
1.89
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netdata.rst.txt
432
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netrc.rst.txt
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new.rst.txt
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nis.rst.txt
2.06
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nntplib.rst.txt
14.19
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numbers.rst.txt
7.82
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numeric.rst.txt
751
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operator.rst.txt
21.57
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optparse.rst.txt
75.29
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os.path.rst.txt
12.79
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os.rst.txt
80.64
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ossaudiodev.rst.txt
16.9
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othergui.rst.txt
2.66
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parser.rst.txt
15.02
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pdb.rst.txt
15.67
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persistence.rst.txt
826
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pickle.rst.txt
36.39
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pickletools.rst.txt
1.95
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pipes.rst.txt
3.7
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pkgutil.rst.txt
7.53
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platform.rst.txt
9.33
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plistlib.rst.txt
4.04
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popen2.rst.txt
6.86
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poplib.rst.txt
6.07
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posix.rst.txt
3.54
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posixfile.rst.txt
7.03
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pprint.rst.txt
8.86
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profile.rst.txt
27.99
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pty.rst.txt
1.72
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pwd.rst.txt
2.66
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py_compile.rst.txt
2.42
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pyclbr.rst.txt
3.22
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pydoc.rst.txt
3.99
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pyexpat.rst.txt
28.21
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python.rst.txt
514
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queue.rst.txt
6.87
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quopri.rst.txt
2.61
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random.rst.txt
13.01
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re.rst.txt
53.81
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readline.rst.txt
10.27
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repr.rst.txt
4.61
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resource.rst.txt
9.37
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restricted.rst.txt
3.25
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rexec.rst.txt
11.47
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rfc822.rst.txt
13.71
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rlcompleter.rst.txt
2.44
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robotparser.rst.txt
2.14
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runpy.rst.txt
6.78
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sched.rst.txt
4.54
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scrolledtext.rst.txt
1.35
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select.rst.txt
20.26
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sets.rst.txt
14.62
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sgi.rst.txt
322
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sgmllib.rst.txt
10.41
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sha.rst.txt
2.74
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shelve.rst.txt
8.12
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shlex.rst.txt
11.05
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shutil.rst.txt
13.17
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signal.rst.txt
10.47
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simplehttpserver.rst.txt
4.45
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simplexmlrpcserver.rst.txt
10.63
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site.rst.txt
7.7
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smtpd.rst.txt
2.41
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smtplib.rst.txt
14.56
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sndhdr.rst.txt
1.72
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socket.rst.txt
39.81
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socketserver.rst.txt
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someos.rst.txt
599
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spwd.rst.txt
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sqlite3.rst.txt
34.62
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ssl.rst.txt
74.91
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stat.rst.txt
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statvfs.rst.txt
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stdtypes.rst.txt
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string.rst.txt
43.05
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stringio.rst.txt
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stringprep.rst.txt
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strings.rst.txt
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struct.rst.txt
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subprocess.rst.txt
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sun.rst.txt
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sunau.rst.txt
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sunaudio.rst.txt
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symbol.rst.txt
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symtable.rst.txt
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sys.rst.txt
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sysconfig.rst.txt
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syslog.rst.txt
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tabnanny.rst.txt
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tarfile.rst.txt
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telnetlib.rst.txt
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tempfile.rst.txt
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termios.rst.txt
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test.rst.txt
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textwrap.rst.txt
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thread.rst.txt
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threading.rst.txt
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time.rst.txt
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timeit.rst.txt
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tix.rst.txt
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tk.rst.txt
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tkinter.rst.txt
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token.rst.txt
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tokenize.rst.txt
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trace.rst.txt
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traceback.rst.txt
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ttk.rst.txt
56.07
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tty.rst.txt
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turtle.rst.txt
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types.rst.txt
6.05
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undoc.rst.txt
6.4
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unicodedata.rst.txt
5.59
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unittest.rst.txt
81.01
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unix.rst.txt
490
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urllib.rst.txt
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urllib2.rst.txt
34.39
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urlparse.rst.txt
16.56
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user.rst.txt
2.68
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userdict.rst.txt
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uu.rst.txt
2.31
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uuid.rst.txt
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warnings.rst.txt
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wave.rst.txt
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weakref.rst.txt
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webbrowser.rst.txt
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whichdb.rst.txt
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windows.rst.txt
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winsound.rst.txt
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wsgiref.rst.txt
29.85
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xdrlib.rst.txt
7.89
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xml.dom.minidom.rst.txt
10.95
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xml.dom.pulldom.rst.txt
1.53
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xml.dom.rst.txt
39.24
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xml.etree.elementtree.rst.txt
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Code Editor : posixfile.rst.txt
:mod:`posixfile` --- File-like objects with locking support =========================================================== .. module:: posixfile :platform: Unix :synopsis: A file-like object with support for locking. :deprecated: .. moduleauthor:: Jaap Vermeulen .. sectionauthor:: Jaap Vermeulen .. index:: pair: POSIX; file object .. deprecated:: 1.5 The locking operation that this module provides is done better and more portably by the :func:`fcntl.lockf` call. .. index:: single: fcntl() (in module fcntl) This module implements some additional functionality over the built-in file objects. In particular, it implements file locking, control over the file flags, and an easy interface to duplicate the file object. The module defines a new file object, the posixfile object. It has all the standard file object methods and adds the methods described below. This module only works for certain flavors of Unix, since it uses :func:`fcntl.fcntl` for file locking. To instantiate a posixfile object, use the :func:`posixfile.open` function. The resulting object looks and feels roughly the same as a standard file object. The :mod:`posixfile` module defines the following constants: .. data:: SEEK_SET Offset is calculated from the start of the file. .. data:: SEEK_CUR Offset is calculated from the current position in the file. .. data:: SEEK_END Offset is calculated from the end of the file. The :mod:`posixfile` module defines the following functions: .. function:: open(filename[, mode[, bufsize]]) Create a new posixfile object with the given filename and mode. The *filename*, *mode* and *bufsize* arguments are interpreted the same way as by the built-in :func:`open` function. .. function:: fileopen(fileobject) Create a new posixfile object with the given standard file object. The resulting object has the same filename and mode as the original file object. The posixfile object defines the following additional methods: .. method:: posixfile.lock(fmt, [len[, start[, whence]]]) Lock the specified section of the file that the file object is referring to. The format is explained below in a table. The *len* argument specifies the length of the section that should be locked. The default is ``0``. *start* specifies the starting offset of the section, where the default is ``0``. The *whence* argument specifies where the offset is relative to. It accepts one of the constants :const:`SEEK_SET`, :const:`SEEK_CUR` or :const:`SEEK_END`. The default is :const:`SEEK_SET`. For more information about the arguments refer to the :manpage:`fcntl(2)` manual page on your system. .. method:: posixfile.flags([flags]) Set the specified flags for the file that the file object is referring to. The new flags are ORed with the old flags, unless specified otherwise. The format is explained below in a table. Without the *flags* argument a string indicating the current flags is returned (this is the same as the ``?`` modifier). For more information about the flags refer to the :manpage:`fcntl(2)` manual page on your system. .. method:: posixfile.dup() Duplicate the file object and the underlying file pointer and file descriptor. The resulting object behaves as if it were newly opened. .. method:: posixfile.dup2(fd) Duplicate the file object and the underlying file pointer and file descriptor. The new object will have the given file descriptor. Otherwise the resulting object behaves as if it were newly opened. .. method:: posixfile.file() Return the standard file object that the posixfile object is based on. This is sometimes necessary for functions that insist on a standard file object. All methods raise :exc:`IOError` when the request fails. Format characters for the :meth:`lock` method have the following meaning: +--------+-----------------------------------------------+ | Format | Meaning | +========+===============================================+ | ``u`` | unlock the specified region | +--------+-----------------------------------------------+ | ``r`` | request a read lock for the specified section | +--------+-----------------------------------------------+ | ``w`` | request a write lock for the specified | | | section | +--------+-----------------------------------------------+ In addition the following modifiers can be added to the format: +----------+--------------------------------+-------+ | Modifier | Meaning | Notes | +==========+================================+=======+ | ``|`` | wait until the lock has been | | | | granted | | +----------+--------------------------------+-------+ | ``?`` | return the first lock | \(1) | | | conflicting with the requested | | | | lock, or ``None`` if there is | | | | no conflict. | | +----------+--------------------------------+-------+ Note: (1) The lock returned is in the format ``(mode, len, start, whence, pid)`` where *mode* is a character representing the type of lock ('r' or 'w'). This modifier prevents a request from being granted; it is for query purposes only. Format characters for the :meth:`flags` method have the following meanings: +--------+-----------------------------------------------+ | Format | Meaning | +========+===============================================+ | ``a`` | append only flag | +--------+-----------------------------------------------+ | ``c`` | close on exec flag | +--------+-----------------------------------------------+ | ``n`` | no delay flag (also called non-blocking flag) | +--------+-----------------------------------------------+ | ``s`` | synchronization flag | +--------+-----------------------------------------------+ In addition the following modifiers can be added to the format: +----------+---------------------------------+-------+ | Modifier | Meaning | Notes | +==========+=================================+=======+ | ``!`` | turn the specified flags 'off', | \(1) | | | instead of the default 'on' | | +----------+---------------------------------+-------+ | ``=`` | replace the flags, instead of | \(1) | | | the default 'OR' operation | | +----------+---------------------------------+-------+ | ``?`` | return a string in which the | \(2) | | | characters represent the flags | | | | that are set. | | +----------+---------------------------------+-------+ Notes: (1) The ``!`` and ``=`` modifiers are mutually exclusive. (2) This string represents the flags after they may have been altered by the same call. Examples:: import posixfile file = posixfile.open('testfile', 'w') file.lock('w|') ... file.lock('u') file.close()
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