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2to3.rst.txt
14.3
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__builtin__.rst.txt
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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
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anydbm.rst.txt
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archiving.rst.txt
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argparse.rst.txt
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array.rst.txt
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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
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basehttpserver.rst.txt
10.16
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bastion.rst.txt
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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
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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
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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
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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
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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
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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
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fnmatch.rst.txt
3.03
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formatter.rst.txt
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fpectl.rst.txt
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fpformat.rst.txt
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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
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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
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language.rst.txt
523
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linecache.rst.txt
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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
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sched.rst.txt
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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
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socket.rst.txt
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socketserver.rst.txt
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someos.rst.txt
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spwd.rst.txt
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sqlite3.rst.txt
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ssl.rst.txt
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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
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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
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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
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urllib.rst.txt
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urllib2.rst.txt
34.39
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urlparse.rst.txt
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user.rst.txt
2.68
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userdict.rst.txt
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uu.rst.txt
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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
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xml.etree.elementtree.rst.txt
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Code Editor : resource.rst.txt
:mod:`resource` --- Resource usage information ============================================== .. module:: resource :platform: Unix :synopsis: An interface to provide resource usage information on the current process. .. moduleauthor:: Jeremy Hylton <jeremy@alum.mit.edu> .. sectionauthor:: Jeremy Hylton <jeremy@alum.mit.edu> This module provides basic mechanisms for measuring and controlling system resources utilized by a program. Symbolic constants are used to specify particular system resources and to request usage information about either the current process or its children. A single exception is defined for errors: .. exception:: error The functions described below may raise this error if the underlying system call failures unexpectedly. Resource Limits --------------- Resources usage can be limited using the :func:`setrlimit` function described below. Each resource is controlled by a pair of limits: a soft limit and a hard limit. The soft limit is the current limit, and may be lowered or raised by a process over time. The soft limit can never exceed the hard limit. The hard limit can be lowered to any value greater than the soft limit, but not raised. (Only processes with the effective UID of the super-user can raise a hard limit.) The specific resources that can be limited are system dependent. They are described in the :manpage:`getrlimit(2)` man page. The resources listed below are supported when the underlying operating system supports them; resources which cannot be checked or controlled by the operating system are not defined in this module for those platforms. .. data:: RLIM_INFINITY Constant used to represent the limit for an unlimited resource. .. function:: getrlimit(resource) Returns a tuple ``(soft, hard)`` with the current soft and hard limits of *resource*. Raises :exc:`ValueError` if an invalid resource is specified, or :exc:`error` if the underlying system call fails unexpectedly. .. function:: setrlimit(resource, limits) Sets new limits of consumption of *resource*. The *limits* argument must be a tuple ``(soft, hard)`` of two integers describing the new limits. A value of :data:`~resource.RLIM_INFINITY` can be used to request a limit that is unlimited. Raises :exc:`ValueError` if an invalid resource is specified, if the new soft limit exceeds the hard limit, or if a process tries to raise its hard limit. Specifying a limit of :data:`~resource.RLIM_INFINITY` when the hard or system limit for that resource is not unlimited will result in a :exc:`ValueError`. A process with the effective UID of super-user can request any valid limit value, including unlimited, but :exc:`ValueError` will still be raised if the requested limit exceeds the system imposed limit. ``setrlimit`` may also raise :exc:`error` if the underlying system call fails. These symbols define resources whose consumption can be controlled using the :func:`setrlimit` and :func:`getrlimit` functions described below. The values of these symbols are exactly the constants used by C programs. The Unix man page for :manpage:`getrlimit(2)` lists the available resources. Note that not all systems use the same symbol or same value to denote the same resource. This module does not attempt to mask platform differences --- symbols not defined for a platform will not be available from this module on that platform. .. data:: RLIMIT_CORE The maximum size (in bytes) of a core file that the current process can create. This may result in the creation of a partial core file if a larger core would be required to contain the entire process image. .. data:: RLIMIT_CPU The maximum amount of processor time (in seconds) that a process can use. If this limit is exceeded, a :const:`SIGXCPU` signal is sent to the process. (See the :mod:`signal` module documentation for information about how to catch this signal and do something useful, e.g. flush open files to disk.) .. data:: RLIMIT_FSIZE The maximum size of a file which the process may create. .. data:: RLIMIT_DATA The maximum size (in bytes) of the process's heap. .. data:: RLIMIT_STACK The maximum size (in bytes) of the call stack for the current process. This only affects the stack of the main thread in a multi-threaded process. .. data:: RLIMIT_RSS The maximum resident set size that should be made available to the process. .. data:: RLIMIT_NPROC The maximum number of processes the current process may create. .. data:: RLIMIT_NOFILE The maximum number of open file descriptors for the current process. .. data:: RLIMIT_OFILE The BSD name for :const:`RLIMIT_NOFILE`. .. data:: RLIMIT_MEMLOCK The maximum address space which may be locked in memory. .. data:: RLIMIT_VMEM The largest area of mapped memory which the process may occupy. .. data:: RLIMIT_AS The maximum area (in bytes) of address space which may be taken by the process. Resource Usage -------------- These functions are used to retrieve resource usage information: .. function:: getrusage(who) This function returns an object that describes the resources consumed by either the current process or its children, as specified by the *who* parameter. The *who* parameter should be specified using one of the :const:`RUSAGE_\*` constants described below. The fields of the return value each describe how a particular system resource has been used, e.g. amount of time spent running is user mode or number of times the process was swapped out of main memory. Some values are dependent on the clock tick internal, e.g. the amount of memory the process is using. For backward compatibility, the return value is also accessible as a tuple of 16 elements. The fields :attr:`ru_utime` and :attr:`ru_stime` of the return value are floating point values representing the amount of time spent executing in user mode and the amount of time spent executing in system mode, respectively. The remaining values are integers. Consult the :manpage:`getrusage(2)` man page for detailed information about these values. A brief summary is presented here: +--------+---------------------+-------------------------------+ | Index | Field | Resource | +========+=====================+===============================+ | ``0`` | :attr:`ru_utime` | time in user mode (float) | +--------+---------------------+-------------------------------+ | ``1`` | :attr:`ru_stime` | time in system mode (float) | +--------+---------------------+-------------------------------+ | ``2`` | :attr:`ru_maxrss` | maximum resident set size | +--------+---------------------+-------------------------------+ | ``3`` | :attr:`ru_ixrss` | shared memory size | +--------+---------------------+-------------------------------+ | ``4`` | :attr:`ru_idrss` | unshared memory size | +--------+---------------------+-------------------------------+ | ``5`` | :attr:`ru_isrss` | unshared stack size | +--------+---------------------+-------------------------------+ | ``6`` | :attr:`ru_minflt` | page faults not requiring I/O | +--------+---------------------+-------------------------------+ | ``7`` | :attr:`ru_majflt` | page faults requiring I/O | +--------+---------------------+-------------------------------+ | ``8`` | :attr:`ru_nswap` | number of swap outs | +--------+---------------------+-------------------------------+ | ``9`` | :attr:`ru_inblock` | block input operations | +--------+---------------------+-------------------------------+ | ``10`` | :attr:`ru_oublock` | block output operations | +--------+---------------------+-------------------------------+ | ``11`` | :attr:`ru_msgsnd` | messages sent | +--------+---------------------+-------------------------------+ | ``12`` | :attr:`ru_msgrcv` | messages received | +--------+---------------------+-------------------------------+ | ``13`` | :attr:`ru_nsignals` | signals received | +--------+---------------------+-------------------------------+ | ``14`` | :attr:`ru_nvcsw` | voluntary context switches | +--------+---------------------+-------------------------------+ | ``15`` | :attr:`ru_nivcsw` | involuntary context switches | +--------+---------------------+-------------------------------+ This function will raise a :exc:`ValueError` if an invalid *who* parameter is specified. It may also raise :exc:`error` exception in unusual circumstances. .. versionchanged:: 2.3 Added access to values as attributes of the returned object. .. function:: getpagesize() Returns the number of bytes in a system page. (This need not be the same as the hardware page size.) The following :const:`RUSAGE_\*` symbols are passed to the :func:`getrusage` function to specify which processes information should be provided for. .. data:: RUSAGE_SELF :const:`RUSAGE_SELF` should be used to request information pertaining only to the process itself. .. data:: RUSAGE_CHILDREN Pass to :func:`getrusage` to request resource information for child processes of the calling process. .. data:: RUSAGE_BOTH Pass to :func:`getrusage` to request resources consumed by both the current process and child processes. May not be available on all systems.
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