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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 : time.rst.txt
:mod:`time` --- Time access and conversions =========================================== .. module:: time :synopsis: Time access and conversions. This module provides various time-related functions. For related functionality, see also the :mod:`datetime` and :mod:`calendar` modules. Although this module is always available, not all functions are available on all platforms. Most of the functions defined in this module call platform C library functions with the same name. It may sometimes be helpful to consult the platform documentation, because the semantics of these functions varies among platforms. An explanation of some terminology and conventions is in order. .. index:: single: epoch * The :dfn:`epoch` is the point where the time starts. On January 1st of that year, at 0 hours, the "time since the epoch" is zero. For Unix, the epoch is 1970. To find out what the epoch is, look at ``gmtime(0)``. .. index:: single: Year 2038 * The functions in this module do not handle dates and times before the epoch or far in the future. The cut-off point in the future is determined by the C library; for Unix, it is typically in 2038. .. index:: single: Year 2000 single: Y2K .. _time-y2kissues: * **Year 2000 (Y2K) issues**: Python depends on the platform's C library, which generally doesn't have year 2000 issues, since all dates and times are represented internally as seconds since the epoch. Functions accepting a :class:`struct_time` (see below) generally require a 4-digit year. For backward compatibility, 2-digit years are supported if the module variable ``accept2dyear`` is a non-zero integer; this variable is initialized to ``1`` unless the environment variable :envvar:`PYTHONY2K` is set to a non-empty string, in which case it is initialized to ``0``. Thus, you can set :envvar:`PYTHONY2K` to a non-empty string in the environment to require 4-digit years for all year input. When 2-digit years are accepted, they are converted according to the POSIX or X/Open standard: values 69-99 are mapped to 1969-1999, and values 0--68 are mapped to 2000--2068. Values 100--1899 are always illegal. .. index:: single: UTC single: Coordinated Universal Time single: Greenwich Mean Time * UTC is Coordinated Universal Time (formerly known as Greenwich Mean Time, or GMT). The acronym UTC is not a mistake but a compromise between English and French. .. index:: single: Daylight Saving Time * DST is Daylight Saving Time, an adjustment of the timezone by (usually) one hour during part of the year. DST rules are magic (determined by local law) and can change from year to year. The C library has a table containing the local rules (often it is read from a system file for flexibility) and is the only source of True Wisdom in this respect. * The precision of the various real-time functions may be less than suggested by the units in which their value or argument is expressed. E.g. on most Unix systems, the clock "ticks" only 50 or 100 times a second. * On the other hand, the precision of :func:`.time` and :func:`sleep` is better than their Unix equivalents: times are expressed as floating point numbers, :func:`.time` returns the most accurate time available (using Unix :c:func:`gettimeofday` where available), and :func:`sleep` will accept a time with a nonzero fraction (Unix :c:func:`select` is used to implement this, where available). * The time value as returned by :func:`gmtime`, :func:`localtime`, and :func:`strptime`, and accepted by :func:`asctime`, :func:`mktime` and :func:`strftime`, may be considered as a sequence of 9 integers. The return values of :func:`gmtime`, :func:`localtime`, and :func:`strptime` also offer attribute names for individual fields. See :class:`struct_time` for a description of these objects. .. versionchanged:: 2.2 The time value sequence was changed from a tuple to a :class:`struct_time`, with the addition of attribute names for the fields. * Use the following functions to convert between time representations: +-------------------------+-------------------------+-------------------------+ | From | To | Use | +=========================+=========================+=========================+ | seconds since the epoch | :class:`struct_time` in | :func:`gmtime` | | | UTC | | +-------------------------+-------------------------+-------------------------+ | seconds since the epoch | :class:`struct_time` in | :func:`localtime` | | | local time | | +-------------------------+-------------------------+-------------------------+ | :class:`struct_time` in | seconds since the epoch | :func:`calendar.timegm` | | UTC | | | +-------------------------+-------------------------+-------------------------+ | :class:`struct_time` in | seconds since the epoch | :func:`mktime` | | local time | | | +-------------------------+-------------------------+-------------------------+ The module defines the following functions and data items: .. data:: accept2dyear Boolean value indicating whether two-digit year values will be accepted. This is true by default, but will be set to false if the environment variable :envvar:`PYTHONY2K` has been set to a non-empty string. It may also be modified at run time. .. data:: altzone The offset of the local DST timezone, in seconds west of UTC, if one is defined. This is negative if the local DST timezone is east of UTC (as in Western Europe, including the UK). Only use this if ``daylight`` is nonzero. .. function:: asctime([t]) Convert a tuple or :class:`struct_time` representing a time as returned by :func:`gmtime` or :func:`localtime` to a 24-character string of the following form: ``'Sun Jun 20 23:21:05 1993'``. If *t* is not provided, the current time as returned by :func:`localtime` is used. Locale information is not used by :func:`asctime`. .. note:: Unlike the C function of the same name, there is no trailing newline. .. versionchanged:: 2.1 Allowed *t* to be omitted. .. function:: clock() .. index:: single: CPU time single: processor time single: benchmarking On Unix, return the current processor time as a floating point number expressed in seconds. The precision, and in fact the very definition of the meaning of "processor time", depends on that of the C function of the same name, but in any case, this is the function to use for benchmarking Python or timing algorithms. On Windows, this function returns wall-clock seconds elapsed since the first call to this function, as a floating point number, based on the Win32 function :c:func:`QueryPerformanceCounter`. The resolution is typically better than one microsecond. .. function:: ctime([secs]) Convert a time expressed in seconds since the epoch to a string representing local time. If *secs* is not provided or :const:`None`, the current time as returned by :func:`.time` is used. ``ctime(secs)`` is equivalent to ``asctime(localtime(secs))``. Locale information is not used by :func:`ctime`. .. versionchanged:: 2.1 Allowed *secs* to be omitted. .. versionchanged:: 2.4 If *secs* is :const:`None`, the current time is used. .. data:: daylight Nonzero if a DST timezone is defined. .. function:: gmtime([secs]) Convert a time expressed in seconds since the epoch to a :class:`struct_time` in UTC in which the dst flag is always zero. If *secs* is not provided or :const:`None`, the current time as returned by :func:`.time` is used. Fractions of a second are ignored. See above for a description of the :class:`struct_time` object. See :func:`calendar.timegm` for the inverse of this function. .. versionchanged:: 2.1 Allowed *secs* to be omitted. .. versionchanged:: 2.4 If *secs* is :const:`None`, the current time is used. .. function:: localtime([secs]) Like :func:`gmtime` but converts to local time. If *secs* is not provided or :const:`None`, the current time as returned by :func:`.time` is used. The dst flag is set to ``1`` when DST applies to the given time. .. versionchanged:: 2.1 Allowed *secs* to be omitted. .. versionchanged:: 2.4 If *secs* is :const:`None`, the current time is used. .. function:: mktime(t) This is the inverse function of :func:`localtime`. Its argument is the :class:`struct_time` or full 9-tuple (since the dst flag is needed; use ``-1`` as the dst flag if it is unknown) which expresses the time in *local* time, not UTC. It returns a floating point number, for compatibility with :func:`.time`. If the input value cannot be represented as a valid time, either :exc:`OverflowError` or :exc:`ValueError` will be raised (which depends on whether the invalid value is caught by Python or the underlying C libraries). The earliest date for which it can generate a time is platform-dependent. .. function:: sleep(secs) Suspend execution of the current thread for the given number of seconds. The argument may be a floating point number to indicate a more precise sleep time. The actual suspension time may be less than that requested because any caught signal will terminate the :func:`sleep` following execution of that signal's catching routine. Also, the suspension time may be longer than requested by an arbitrary amount because of the scheduling of other activity in the system. .. function:: strftime(format[, t]) Convert a tuple or :class:`struct_time` representing a time as returned by :func:`gmtime` or :func:`localtime` to a string as specified by the *format* argument. If *t* is not provided, the current time as returned by :func:`localtime` is used. *format* must be a string. :exc:`ValueError` is raised if any field in *t* is outside of the allowed range. :func:`strftime` returns a locale dependent byte string; the result may be converted to unicode by doing ``strftime(<myformat>).decode(locale.getlocale()[1])``. .. versionchanged:: 2.1 Allowed *t* to be omitted. .. versionchanged:: 2.4 :exc:`ValueError` raised if a field in *t* is out of range. .. versionchanged:: 2.5 0 is now a legal argument for any position in the time tuple; if it is normally illegal the value is forced to a correct one. The following directives can be embedded in the *format* string. They are shown without the optional field width and precision specification, and are replaced by the indicated characters in the :func:`strftime` result: +-----------+--------------------------------+-------+ | Directive | Meaning | Notes | +===========+================================+=======+ | ``%a`` | Locale's abbreviated weekday | | | | name. | | +-----------+--------------------------------+-------+ | ``%A`` | Locale's full weekday name. | | +-----------+--------------------------------+-------+ | ``%b`` | Locale's abbreviated month | | | | name. | | +-----------+--------------------------------+-------+ | ``%B`` | Locale's full month name. | | +-----------+--------------------------------+-------+ | ``%c`` | Locale's appropriate date and | | | | time representation. | | +-----------+--------------------------------+-------+ | ``%d`` | Day of the month as a decimal | | | | number [01,31]. | | +-----------+--------------------------------+-------+ | ``%H`` | Hour (24-hour clock) as a | | | | decimal number [00,23]. | | +-----------+--------------------------------+-------+ | ``%I`` | Hour (12-hour clock) as a | | | | decimal number [01,12]. | | +-----------+--------------------------------+-------+ | ``%j`` | Day of the year as a decimal | | | | number [001,366]. | | +-----------+--------------------------------+-------+ | ``%m`` | Month as a decimal number | | | | [01,12]. | | +-----------+--------------------------------+-------+ | ``%M`` | Minute as a decimal number | | | | [00,59]. | | +-----------+--------------------------------+-------+ | ``%p`` | Locale's equivalent of either | \(1) | | | AM or PM. | | +-----------+--------------------------------+-------+ | ``%S`` | Second as a decimal number | \(2) | | | [00,61]. | | +-----------+--------------------------------+-------+ | ``%U`` | Week number of the year | \(3) | | | (Sunday as the first day of | | | | the week) as a decimal number | | | | [00,53]. All days in a new | | | | year preceding the first | | | | Sunday are considered to be in | | | | week 0. | | +-----------+--------------------------------+-------+ | ``%w`` | Weekday as a decimal number | | | | [0(Sunday),6]. | | +-----------+--------------------------------+-------+ | ``%W`` | Week number of the year | \(3) | | | (Monday as the first day of | | | | the week) as a decimal number | | | | [00,53]. All days in a new | | | | year preceding the first | | | | Monday are considered to be in | | | | week 0. | | +-----------+--------------------------------+-------+ | ``%x`` | Locale's appropriate date | | | | representation. | | +-----------+--------------------------------+-------+ | ``%X`` | Locale's appropriate time | | | | representation. | | +-----------+--------------------------------+-------+ | ``%y`` | Year without century as a | | | | decimal number [00,99]. | | +-----------+--------------------------------+-------+ | ``%Y`` | Year with century as a decimal | | | | number. | | +-----------+--------------------------------+-------+ | ``%Z`` | Time zone name (no characters | | | | if no time zone exists). | | +-----------+--------------------------------+-------+ | ``%%`` | A literal ``'%'`` character. | | +-----------+--------------------------------+-------+ Notes: (1) When used with the :func:`strptime` function, the ``%p`` directive only affects the output hour field if the ``%I`` directive is used to parse the hour. (2) The range really is ``0`` to ``61``; this accounts for leap seconds and the (very rare) double leap seconds. (3) When used with the :func:`strptime` function, ``%U`` and ``%W`` are only used in calculations when the day of the week and the year are specified. Here is an example, a format for dates compatible with that specified in the :rfc:`2822` Internet email standard. [#]_ :: >>> from time import gmtime, strftime >>> strftime("%a, %d %b %Y %H:%M:%S +0000", gmtime()) 'Thu, 28 Jun 2001 14:17:15 +0000' Additional directives may be supported on certain platforms, but only the ones listed here have a meaning standardized by ANSI C. To see the full set of format codes supported on your platform, consult the :manpage:`strftime(3)` documentation. On some platforms, an optional field width and precision specification can immediately follow the initial ``'%'`` of a directive in the following order; this is also not portable. The field width is normally 2 except for ``%j`` where it is 3. .. function:: strptime(string[, format]) Parse a string representing a time according to a format. The return value is a :class:`struct_time` as returned by :func:`gmtime` or :func:`localtime`. The *format* parameter uses the same directives as those used by :func:`strftime`; it defaults to ``"%a %b %d %H:%M:%S %Y"`` which matches the formatting returned by :func:`ctime`. If *string* cannot be parsed according to *format*, or if it has excess data after parsing, :exc:`ValueError` is raised. The default values used to fill in any missing data when more accurate values cannot be inferred are ``(1900, 1, 1, 0, 0, 0, 0, 1, -1)``. For example: >>> import time >>> time.strptime("30 Nov 00", "%d %b %y") # doctest: +NORMALIZE_WHITESPACE time.struct_time(tm_year=2000, tm_mon=11, tm_mday=30, tm_hour=0, tm_min=0, tm_sec=0, tm_wday=3, tm_yday=335, tm_isdst=-1) Support for the ``%Z`` directive is based on the values contained in ``tzname`` and whether ``daylight`` is true. Because of this, it is platform-specific except for recognizing UTC and GMT which are always known (and are considered to be non-daylight savings timezones). Only the directives specified in the documentation are supported. Because ``strftime()`` is implemented per platform it can sometimes offer more directives than those listed. But ``strptime()`` is independent of any platform and thus does not necessarily support all directives available that are not documented as supported. .. class:: struct_time The type of the time value sequence returned by :func:`gmtime`, :func:`localtime`, and :func:`strptime`. It is an object with a :term:`named tuple` interface: values can be accessed by index and by attribute name. The following values are present: +-------+-------------------+---------------------------------+ | Index | Attribute | Values | +=======+===================+=================================+ | 0 | :attr:`tm_year` | (for example, 1993) | +-------+-------------------+---------------------------------+ | 1 | :attr:`tm_mon` | range [1, 12] | +-------+-------------------+---------------------------------+ | 2 | :attr:`tm_mday` | range [1, 31] | +-------+-------------------+---------------------------------+ | 3 | :attr:`tm_hour` | range [0, 23] | +-------+-------------------+---------------------------------+ | 4 | :attr:`tm_min` | range [0, 59] | +-------+-------------------+---------------------------------+ | 5 | :attr:`tm_sec` | range [0, 61]; see **(2)** in | | | | :func:`strftime` description | +-------+-------------------+---------------------------------+ | 6 | :attr:`tm_wday` | range [0, 6], Monday is 0 | +-------+-------------------+---------------------------------+ | 7 | :attr:`tm_yday` | range [1, 366] | +-------+-------------------+---------------------------------+ | 8 | :attr:`tm_isdst` | 0, 1 or -1; see below | +-------+-------------------+---------------------------------+ .. versionadded:: 2.2 Note that unlike the C structure, the month value is a range of [1, 12], not [0, 11]. A year value will be handled as described under :ref:`Year 2000 (Y2K) issues <time-y2kissues>` above. In calls to :func:`mktime`, :attr:`tm_isdst` may be set to 1 when daylight savings time is in effect, and 0 when it is not. A value of -1 indicates that this is not known, and will usually result in the correct state being filled in. When a tuple with an incorrect length is passed to a function expecting a :class:`struct_time`, or having elements of the wrong type, a :exc:`TypeError` is raised. .. function:: time() Return the time in seconds since the epoch as a floating point number. Note that even though the time is always returned as a floating point number, not all systems provide time with a better precision than 1 second. While this function normally returns non-decreasing values, it can return a lower value than a previous call if the system clock has been set back between the two calls. .. data:: timezone The offset of the local (non-DST) timezone, in seconds west of UTC (negative in most of Western Europe, positive in the US, zero in the UK). .. data:: tzname A tuple of two strings: the first is the name of the local non-DST timezone, the second is the name of the local DST timezone. If no DST timezone is defined, the second string should not be used. .. function:: tzset() Reset the time conversion rules used by the library routines. The environment variable :envvar:`TZ` specifies how this is done. It will also set the variables ``tzname`` (from the :envvar:`TZ` environment variable), ``timezone`` (non-DST seconds West of UTC), ``altzone`` (DST seconds west of UTC) and ``daylight`` (to 0 if this timezone does not have any daylight saving time rules, or to nonzero if there is a time, past, present or future when daylight saving time applies). .. versionadded:: 2.3 Availability: Unix. .. note:: Although in many cases, changing the :envvar:`TZ` environment variable may affect the output of functions like :func:`localtime` without calling :func:`tzset`, this behavior should not be relied on. The :envvar:`TZ` environment variable should contain no whitespace. The standard format of the :envvar:`TZ` environment variable is (whitespace added for clarity):: std offset [dst [offset [,start[/time], end[/time]]]] Where the components are: ``std`` and ``dst`` Three or more alphanumerics giving the timezone abbreviations. These will be propagated into time.tzname ``offset`` The offset has the form: ``± hh[:mm[:ss]]``. This indicates the value added the local time to arrive at UTC. If preceded by a '-', the timezone is east of the Prime Meridian; otherwise, it is west. If no offset follows dst, summer time is assumed to be one hour ahead of standard time. ``start[/time], end[/time]`` Indicates when to change to and back from DST. The format of the start and end dates are one of the following: :samp:`J{n}` The Julian day *n* (1 <= *n* <= 365). Leap days are not counted, so in all years February 28 is day 59 and March 1 is day 60. :samp:`{n}` The zero-based Julian day (0 <= *n* <= 365). Leap days are counted, and it is possible to refer to February 29. :samp:`M{m}.{n}.{d}` The *d*'th day (0 <= *d* <= 6) or week *n* of month *m* of the year (1 <= *n* <= 5, 1 <= *m* <= 12, where week 5 means "the last *d* day in month *m*" which may occur in either the fourth or the fifth week). Week 1 is the first week in which the *d*'th day occurs. Day zero is Sunday. ``time`` has the same format as ``offset`` except that no leading sign ('-' or '+') is allowed. The default, if time is not given, is 02:00:00. :: >>> os.environ['TZ'] = 'EST+05EDT,M4.1.0,M10.5.0' >>> time.tzset() >>> time.strftime('%X %x %Z') '02:07:36 05/08/03 EDT' >>> os.environ['TZ'] = 'AEST-10AEDT-11,M10.5.0,M3.5.0' >>> time.tzset() >>> time.strftime('%X %x %Z') '16:08:12 05/08/03 AEST' On many Unix systems (including \*BSD, Linux, Solaris, and Darwin), it is more convenient to use the system's zoneinfo (:manpage:`tzfile(5)`) database to specify the timezone rules. To do this, set the :envvar:`TZ` environment variable to the path of the required timezone datafile, relative to the root of the systems 'zoneinfo' timezone database, usually located at :file:`/usr/share/zoneinfo`. For example, ``'US/Eastern'``, ``'Australia/Melbourne'``, ``'Egypt'`` or ``'Europe/Amsterdam'``. :: >>> os.environ['TZ'] = 'US/Eastern' >>> time.tzset() >>> time.tzname ('EST', 'EDT') >>> os.environ['TZ'] = 'Egypt' >>> time.tzset() >>> time.tzname ('EET', 'EEST') .. seealso:: Module :mod:`datetime` More object-oriented interface to dates and times. Module :mod:`locale` Internationalization services. The locale setting affects the interpretation of many format specifiers in :func:`strftime` and :func:`strptime`. Module :mod:`calendar` General calendar-related functions. :func:`~calendar.timegm` is the inverse of :func:`gmtime` from this module. .. rubric:: Footnotes .. [#] The use of ``%Z`` is now deprecated, but the ``%z`` escape that expands to the preferred hour/minute offset is not supported by all ANSI C libraries. Also, a strict reading of the original 1982 :rfc:`822` standard calls for a two-digit year (%y rather than %Y), but practice moved to 4-digit years long before the year 2000. After that, :rfc:`822` became obsolete and the 4-digit year has been first recommended by :rfc:`1123` and then mandated by :rfc:`2822`.
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