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2to3.html
58.11
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2019-03-27 12:19
__builtin__.html
10.81
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__future__.html
14.34
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__main__.html
7.34
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_winreg.html
63.12
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abc.html
25.22
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aepack.html
13.83
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aetools.html
16
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aetypes.html
20.53
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aifc.html
24.48
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al.html
18.23
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allos.html
34.47
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anydbm.html
17.7
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archiving.html
9.84
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argparse.html
257.44
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array.html
31.11
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ast.html
37.27
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asynchat.html
33.13
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asyncore.html
39.68
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atexit.html
18.02
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audioop.html
33.45
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autogil.html
8.53
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base64.html
21.35
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basehttpserver.html
36.56
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bastion.html
11.52
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bdb.html
40.42
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binascii.html
22.46
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binhex.html
11.04
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bisect.html
24.09
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bsddb.html
27.92
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bz2.html
28.37
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calendar.html
40.78
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carbon.html
50.78
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cd.html
29.33
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cgi.html
54.61
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cgihttpserver.html
13.7
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cgitb.html
11.98
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chunk.html
15.53
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cmath.html
27.7
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cmd.html
28.36
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code.html
26.33
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codecs.html
115.49
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codeop.html
15.53
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collections.html
144.19
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colorpicker.html
7.85
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colorsys.html
11.64
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commands.html
15.15
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compileall.html
18.18
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compiler.html
74.12
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configparser.html
66.16
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constants.html
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contextlib.html
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cookie.html
40.87
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cookielib.html
88.9
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copy.html
12.7
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copy_reg.html
14.35
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crypt.html
10.4
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crypto.html
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csv.html
74.66
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ctypes.html
258.37
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curses.ascii.html
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curses.html
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curses.panel.html
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custominterp.html
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datatypes.html
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datetime.html
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dbhash.html
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dbm.html
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debug.html
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decimal.html
217.1
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development.html
14.48
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difflib.html
89.82
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2019-03-27 12:19
dircache.html
12.01
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2019-03-27 12:19
dis.html
82.18
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distribution.html
7.5
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distutils.html
9.91
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dl.html
17.25
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doctest.html
181.53
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docxmlrpcserver.html
17.16
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2019-03-27 12:19
dumbdbm.html
15.18
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dummy_thread.html
9.83
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dummy_threading.html
8.72
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2019-03-27 12:19
easydialogs.html
32.35
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2019-03-27 12:19
email-examples.html
46.31
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2019-03-27 12:19
email.charset.html
28.73
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2019-03-27 12:19
email.encoders.html
12.55
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email.errors.html
17.53
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email.generator.html
22.6
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email.header.html
28.43
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email.html
54.42
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email.iterators.html
12.33
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email.message.html
68.54
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email.mime.html
30.91
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2019-03-27 12:19
email.parser.html
34.32
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2019-03-27 12:19
email.utils.html
26.44
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2019-03-27 12:19
ensurepip.html
17.9
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2019-03-27 12:19
errno.html
39.3
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2019-03-27 12:19
exceptions.html
62.2
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2019-03-27 12:19
fcntl.html
25.63
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filecmp.html
23.43
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2019-03-27 12:19
fileformats.html
9.43
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fileinput.html
26.44
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filesys.html
10.61
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fl.html
55.2
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2019-03-27 12:19
fm.html
12.7
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fnmatch.html
15.88
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2019-03-27 12:19
formatter.html
36.5
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fpectl.html
16.48
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fpformat.html
11.19
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2019-03-27 12:19
fractions.html
24.3
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framework.html
36.07
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frameworks.html
7.37
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ftplib.html
48.42
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functions.html
200.82
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functools.html
28.95
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future_builtins.html
14.14
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gc.html
27.76
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gdbm.html
17.39
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gensuitemodule.html
12.28
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getopt.html
24.69
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getpass.html
11.16
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gettext.html
82.98
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gl.html
23.77
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glob.html
14.09
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grp.html
11.05
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gzip.html
20.09
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hashlib.html
24.87
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2019-03-27 12:19
heapq.html
34.07
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hmac.html
14.04
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hotshot.html
19.67
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htmllib.html
27.03
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htmlparser.html
41.44
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httplib.html
69.27
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i18n.html
9.81
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ic.html
18.22
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idle.html
41.16
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imageop.html
15.72
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imaplib.html
57.14
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imgfile.html
12.43
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imghdr.html
11.95
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imp.html
36.72
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importlib.html
8.72
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imputil.html
32.78
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index.html
77.23
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inspect.html
55.49
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internet.html
25.53
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intro.html
9.13
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io.html
111.04
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ipc.html
16.21
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itertools.html
122.46
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jpeg.html
13.43
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json.html
71.95
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keyword.html
8.02
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language.html
11.41
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linecache.html
11.15
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locale.html
60.13
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logging.config.html
78.17
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logging.handlers.html
78.31
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logging.html
107.67
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mac.html
22.83
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macos.html
15.75
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macosa.html
13.75
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macostools.html
16.5
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macpath.html
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mailbox.html
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mailcap.html
13.8
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markup.html
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marshal.html
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math.html
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md5.html
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mhlib.html
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mimetools.html
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mimetypes.html
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mimewriter.html
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mimify.html
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miniaeframe.html
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misc.html
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mm.html
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mmap.html
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modulefinder.html
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modules.html
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msilib.html
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msvcrt.html
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multifile.html
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multiprocessing.html
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mutex.html
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netdata.html
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netrc.html
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new.html
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nis.html
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nntplib.html
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numbers.html
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numeric.html
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operator.html
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optparse.html
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os.html
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os.path.html
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ossaudiodev.html
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othergui.html
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parser.html
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pdb.html
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persistence.html
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pickle.html
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pickletools.html
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pipes.html
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pkgutil.html
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platform.html
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plistlib.html
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popen2.html
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poplib.html
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posix.html
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posixfile.html
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pprint.html
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profile.html
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pty.html
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pwd.html
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py_compile.html
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pyclbr.html
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pydoc.html
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pyexpat.html
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python.html
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queue.html
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quopri.html
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random.html
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re.html
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readline.html
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repr.html
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resource.html
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restricted.html
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rexec.html
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rfc822.html
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rlcompleter.html
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robotparser.html
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runpy.html
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sched.html
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scrolledtext.html
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select.html
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sets.html
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sgi.html
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sgmllib.html
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sha.html
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shelve.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="X-UA-Compatible" content="IE=Edge" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>9.3. cmath — Mathematical functions for complex numbers — Python 2.7.16 documentation</title> <link rel="stylesheet" href="../_static/classic.css" type="text/css" /> <link rel="stylesheet" href="../_static/pygments.css" type="text/css" /> <script type="text/javascript" id="documentation_options" data-url_root="../" src="../_static/documentation_options.js"></script> <script type="text/javascript" src="../_static/jquery.js"></script> <script type="text/javascript" src="../_static/underscore.js"></script> <script type="text/javascript" src="../_static/doctools.js"></script> <script type="text/javascript" src="../_static/sidebar.js"></script> <link rel="search" type="application/opensearchdescription+xml" title="Search within Python 2.7.16 documentation" href="../_static/opensearch.xml"/> <link rel="author" title="About these documents" href="../about.html" /> <link rel="index" title="Index" href="../genindex.html" /> <link rel="search" title="Search" href="../search.html" /> <link rel="copyright" title="Copyright" href="../copyright.html" /> <link rel="next" title="9.4. decimal — Decimal fixed point and floating point arithmetic" href="decimal.html" /> <link rel="prev" title="9.2. math — Mathematical functions" href="math.html" /> <link rel="shortcut icon" type="image/png" href="../_static/py.png" /> <link rel="canonical" href="https://docs.python.org/2/library/cmath.html" /> <script type="text/javascript" src="../_static/copybutton.js"></script> </head><body> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" accesskey="I">index</a></li> <li class="right" > <a href="../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="decimal.html" title="9.4. decimal — Decimal fixed point and floating point arithmetic" accesskey="N">next</a> |</li> <li class="right" > <a href="math.html" title="9.2. math — Mathematical functions" accesskey="P">previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="https://www.python.org/">Python</a> »</li> <li> <a href="../index.html">Python 2.7.16 documentation</a> » </li> <li class="nav-item nav-item-1"><a href="index.html" >The Python Standard Library</a> »</li> <li class="nav-item nav-item-2"><a href="numeric.html" accesskey="U">9. Numeric and Mathematical Modules</a> »</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body" role="main"> <div class="section" id="module-cmath"> <span id="cmath-mathematical-functions-for-complex-numbers"></span><h1>9.3. <a class="reference internal" href="#module-cmath" title="cmath: Mathematical functions for complex numbers."><code class="xref py py-mod docutils literal notranslate"><span class="pre">cmath</span></code></a> — Mathematical functions for complex numbers<a class="headerlink" href="#module-cmath" title="Permalink to this headline">¶</a></h1> <p>This module is always available. It provides access to mathematical functions for complex numbers. The functions in this module accept integers, floating-point numbers or complex numbers as arguments. They will also accept any Python object that has either a <a class="reference internal" href="../reference/datamodel.html#object.__complex__" title="object.__complex__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__complex__()</span></code></a> or a <a class="reference internal" href="../reference/datamodel.html#object.__float__" title="object.__float__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__float__()</span></code></a> method: these methods are used to convert the object to a complex or floating-point number, respectively, and the function is then applied to the result of the conversion.</p> <div class="admonition note"> <p class="first admonition-title">Note</p> <p class="last">On platforms with hardware and system-level support for signed zeros, functions involving branch cuts are continuous on <em>both</em> sides of the branch cut: the sign of the zero distinguishes one side of the branch cut from the other. On platforms that do not support signed zeros the continuity is as specified below.</p> </div> <div class="section" id="conversions-to-and-from-polar-coordinates"> <h2>9.3.1. Conversions to and from polar coordinates<a class="headerlink" href="#conversions-to-and-from-polar-coordinates" title="Permalink to this headline">¶</a></h2> <p>A Python complex number <code class="docutils literal notranslate"><span class="pre">z</span></code> is stored internally using <em>rectangular</em> or <em>Cartesian</em> coordinates. It is completely determined by its <em>real part</em> <code class="docutils literal notranslate"><span class="pre">z.real</span></code> and its <em>imaginary part</em> <code class="docutils literal notranslate"><span class="pre">z.imag</span></code>. In other words:</p> <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">z</span> <span class="o">==</span> <span class="n">z</span><span class="o">.</span><span class="n">real</span> <span class="o">+</span> <span class="n">z</span><span class="o">.</span><span class="n">imag</span><span class="o">*</span><span class="mi">1</span><span class="n">j</span> </pre></div> </div> <p><em>Polar coordinates</em> give an alternative way to represent a complex number. In polar coordinates, a complex number <em>z</em> is defined by the modulus <em>r</em> and the phase angle <em>phi</em>. The modulus <em>r</em> is the distance from <em>z</em> to the origin, while the phase <em>phi</em> is the counterclockwise angle, measured in radians, from the positive x-axis to the line segment that joins the origin to <em>z</em>.</p> <p>The following functions can be used to convert from the native rectangular coordinates to polar coordinates and back.</p> <dl class="function"> <dt id="cmath.phase"> <code class="descclassname">cmath.</code><code class="descname">phase</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#cmath.phase" title="Permalink to this definition">¶</a></dt> <dd><p>Return the phase of <em>x</em> (also known as the <em>argument</em> of <em>x</em>), as a float. <code class="docutils literal notranslate"><span class="pre">phase(x)</span></code> is equivalent to <code class="docutils literal notranslate"><span class="pre">math.atan2(x.imag,</span> <span class="pre">x.real)</span></code>. The result lies in the range [-π, π], and the branch cut for this operation lies along the negative real axis, continuous from above. On systems with support for signed zeros (which includes most systems in current use), this means that the sign of the result is the same as the sign of <code class="docutils literal notranslate"><span class="pre">x.imag</span></code>, even when <code class="docutils literal notranslate"><span class="pre">x.imag</span></code> is zero:</p> <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="n">phase</span><span class="p">(</span><span class="nb">complex</span><span class="p">(</span><span class="o">-</span><span class="mf">1.0</span><span class="p">,</span> <span class="mf">0.0</span><span class="p">))</span> <span class="go">3.1415926535897931</span> <span class="gp">>>> </span><span class="n">phase</span><span class="p">(</span><span class="nb">complex</span><span class="p">(</span><span class="o">-</span><span class="mf">1.0</span><span class="p">,</span> <span class="o">-</span><span class="mf">0.0</span><span class="p">))</span> <span class="go">-3.1415926535897931</span> </pre></div> </div> <div class="versionadded"> <p><span class="versionmodified">New in version 2.6.</span></p> </div> </dd></dl> <div class="admonition note"> <p class="first admonition-title">Note</p> <p class="last">The modulus (absolute value) of a complex number <em>x</em> can be computed using the built-in <a class="reference internal" href="functions.html#abs" title="abs"><code class="xref py py-func docutils literal notranslate"><span class="pre">abs()</span></code></a> function. There is no separate <a class="reference internal" href="#module-cmath" title="cmath: Mathematical functions for complex numbers."><code class="xref py py-mod docutils literal notranslate"><span class="pre">cmath</span></code></a> module function for this operation.</p> </div> <dl class="function"> <dt id="cmath.polar"> <code class="descclassname">cmath.</code><code class="descname">polar</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#cmath.polar" title="Permalink to this definition">¶</a></dt> <dd><p>Return the representation of <em>x</em> in polar coordinates. Returns a pair <code class="docutils literal notranslate"><span class="pre">(r,</span> <span class="pre">phi)</span></code> where <em>r</em> is the modulus of <em>x</em> and phi is the phase of <em>x</em>. <code class="docutils literal notranslate"><span class="pre">polar(x)</span></code> is equivalent to <code class="docutils literal notranslate"><span class="pre">(abs(x),</span> <span class="pre">phase(x))</span></code>.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 2.6.</span></p> </div> </dd></dl> <dl class="function"> <dt id="cmath.rect"> <code class="descclassname">cmath.</code><code class="descname">rect</code><span class="sig-paren">(</span><em>r</em>, <em>phi</em><span class="sig-paren">)</span><a class="headerlink" href="#cmath.rect" title="Permalink to this definition">¶</a></dt> <dd><p>Return the complex number <em>x</em> with polar coordinates <em>r</em> and <em>phi</em>. Equivalent to <code class="docutils literal notranslate"><span class="pre">r</span> <span class="pre">*</span> <span class="pre">(math.cos(phi)</span> <span class="pre">+</span> <span class="pre">math.sin(phi)*1j)</span></code>.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 2.6.</span></p> </div> </dd></dl> </div> <div class="section" id="power-and-logarithmic-functions"> <h2>9.3.2. Power and logarithmic functions<a class="headerlink" href="#power-and-logarithmic-functions" title="Permalink to this headline">¶</a></h2> <dl class="function"> <dt id="cmath.exp"> <code class="descclassname">cmath.</code><code class="descname">exp</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#cmath.exp" title="Permalink to this definition">¶</a></dt> <dd><p>Return the exponential value <code class="docutils literal notranslate"><span class="pre">e**x</span></code>.</p> </dd></dl> <dl class="function"> <dt id="cmath.log"> <code class="descclassname">cmath.</code><code class="descname">log</code><span class="sig-paren">(</span><em>x</em><span class="optional">[</span>, <em>base</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#cmath.log" title="Permalink to this definition">¶</a></dt> <dd><p>Returns the logarithm of <em>x</em> to the given <em>base</em>. If the <em>base</em> is not specified, returns the natural logarithm of <em>x</em>. There is one branch cut, from 0 along the negative real axis to -∞, continuous from above.</p> <div class="versionchanged"> <p><span class="versionmodified">Changed in version 2.4: </span><em>base</em> argument added.</p> </div> </dd></dl> <dl class="function"> <dt id="cmath.log10"> <code class="descclassname">cmath.</code><code class="descname">log10</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#cmath.log10" title="Permalink to this definition">¶</a></dt> <dd><p>Return the base-10 logarithm of <em>x</em>. This has the same branch cut as <a class="reference internal" href="#cmath.log" title="cmath.log"><code class="xref py py-func docutils literal notranslate"><span class="pre">log()</span></code></a>.</p> </dd></dl> <dl class="function"> <dt id="cmath.sqrt"> <code class="descclassname">cmath.</code><code class="descname">sqrt</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#cmath.sqrt" title="Permalink to this definition">¶</a></dt> <dd><p>Return the square root of <em>x</em>. This has the same branch cut as <a class="reference internal" href="#cmath.log" title="cmath.log"><code class="xref py py-func docutils literal notranslate"><span class="pre">log()</span></code></a>.</p> </dd></dl> </div> <div class="section" id="trigonometric-functions"> <h2>9.3.3. Trigonometric functions<a class="headerlink" href="#trigonometric-functions" title="Permalink to this headline">¶</a></h2> <dl class="function"> <dt id="cmath.acos"> <code class="descclassname">cmath.</code><code class="descname">acos</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#cmath.acos" title="Permalink to this definition">¶</a></dt> <dd><p>Return the arc cosine of <em>x</em>. There are two branch cuts: One extends right from 1 along the real axis to ∞, continuous from below. The other extends left from -1 along the real axis to -∞, continuous from above.</p> </dd></dl> <dl class="function"> <dt id="cmath.asin"> <code class="descclassname">cmath.</code><code class="descname">asin</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#cmath.asin" title="Permalink to this definition">¶</a></dt> <dd><p>Return the arc sine of <em>x</em>. This has the same branch cuts as <a class="reference internal" href="#cmath.acos" title="cmath.acos"><code class="xref py py-func docutils literal notranslate"><span class="pre">acos()</span></code></a>.</p> </dd></dl> <dl class="function"> <dt id="cmath.atan"> <code class="descclassname">cmath.</code><code class="descname">atan</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#cmath.atan" title="Permalink to this definition">¶</a></dt> <dd><p>Return the arc tangent of <em>x</em>. There are two branch cuts: One extends from <code class="docutils literal notranslate"><span class="pre">1j</span></code> along the imaginary axis to <code class="docutils literal notranslate"><span class="pre">∞j</span></code>, continuous from the right. The other extends from <code class="docutils literal notranslate"><span class="pre">-1j</span></code> along the imaginary axis to <code class="docutils literal notranslate"><span class="pre">-∞j</span></code>, continuous from the left.</p> <div class="versionchanged"> <p><span class="versionmodified">Changed in version 2.6: </span>direction of continuity of upper cut reversed</p> </div> </dd></dl> <dl class="function"> <dt id="cmath.cos"> <code class="descclassname">cmath.</code><code class="descname">cos</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#cmath.cos" title="Permalink to this definition">¶</a></dt> <dd><p>Return the cosine of <em>x</em>.</p> </dd></dl> <dl class="function"> <dt id="cmath.sin"> <code class="descclassname">cmath.</code><code class="descname">sin</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#cmath.sin" title="Permalink to this definition">¶</a></dt> <dd><p>Return the sine of <em>x</em>.</p> </dd></dl> <dl class="function"> <dt id="cmath.tan"> <code class="descclassname">cmath.</code><code class="descname">tan</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#cmath.tan" title="Permalink to this definition">¶</a></dt> <dd><p>Return the tangent of <em>x</em>.</p> </dd></dl> </div> <div class="section" id="hyperbolic-functions"> <h2>9.3.4. Hyperbolic functions<a class="headerlink" href="#hyperbolic-functions" title="Permalink to this headline">¶</a></h2> <dl class="function"> <dt id="cmath.acosh"> <code class="descclassname">cmath.</code><code class="descname">acosh</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#cmath.acosh" title="Permalink to this definition">¶</a></dt> <dd><p>Return the inverse hyperbolic cosine of <em>x</em>. There is one branch cut, extending left from 1 along the real axis to -∞, continuous from above.</p> </dd></dl> <dl class="function"> <dt id="cmath.asinh"> <code class="descclassname">cmath.</code><code class="descname">asinh</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#cmath.asinh" title="Permalink to this definition">¶</a></dt> <dd><p>Return the inverse hyperbolic sine of <em>x</em>. There are two branch cuts: One extends from <code class="docutils literal notranslate"><span class="pre">1j</span></code> along the imaginary axis to <code class="docutils literal notranslate"><span class="pre">∞j</span></code>, continuous from the right. The other extends from <code class="docutils literal notranslate"><span class="pre">-1j</span></code> along the imaginary axis to <code class="docutils literal notranslate"><span class="pre">-∞j</span></code>, continuous from the left.</p> <div class="versionchanged"> <p><span class="versionmodified">Changed in version 2.6: </span>branch cuts moved to match those recommended by the C99 standard</p> </div> </dd></dl> <dl class="function"> <dt id="cmath.atanh"> <code class="descclassname">cmath.</code><code class="descname">atanh</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#cmath.atanh" title="Permalink to this definition">¶</a></dt> <dd><p>Return the inverse hyperbolic tangent of <em>x</em>. There are two branch cuts: One extends from <code class="docutils literal notranslate"><span class="pre">1</span></code> along the real axis to <code class="docutils literal notranslate"><span class="pre">∞</span></code>, continuous from below. The other extends from <code class="docutils literal notranslate"><span class="pre">-1</span></code> along the real axis to <code class="docutils literal notranslate"><span class="pre">-∞</span></code>, continuous from above.</p> <div class="versionchanged"> <p><span class="versionmodified">Changed in version 2.6: </span>direction of continuity of right cut reversed</p> </div> </dd></dl> <dl class="function"> <dt id="cmath.cosh"> <code class="descclassname">cmath.</code><code class="descname">cosh</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#cmath.cosh" title="Permalink to this definition">¶</a></dt> <dd><p>Return the hyperbolic cosine of <em>x</em>.</p> </dd></dl> <dl class="function"> <dt id="cmath.sinh"> <code class="descclassname">cmath.</code><code class="descname">sinh</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#cmath.sinh" title="Permalink to this definition">¶</a></dt> <dd><p>Return the hyperbolic sine of <em>x</em>.</p> </dd></dl> <dl class="function"> <dt id="cmath.tanh"> <code class="descclassname">cmath.</code><code class="descname">tanh</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#cmath.tanh" title="Permalink to this definition">¶</a></dt> <dd><p>Return the hyperbolic tangent of <em>x</em>.</p> </dd></dl> </div> <div class="section" id="classification-functions"> <h2>9.3.5. Classification functions<a class="headerlink" href="#classification-functions" title="Permalink to this headline">¶</a></h2> <dl class="function"> <dt id="cmath.isinf"> <code class="descclassname">cmath.</code><code class="descname">isinf</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#cmath.isinf" title="Permalink to this definition">¶</a></dt> <dd><p>Return <code class="docutils literal notranslate"><span class="pre">True</span></code> if the real or the imaginary part of x is positive or negative infinity.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 2.6.</span></p> </div> </dd></dl> <dl class="function"> <dt id="cmath.isnan"> <code class="descclassname">cmath.</code><code class="descname">isnan</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#cmath.isnan" title="Permalink to this definition">¶</a></dt> <dd><p>Return <code class="docutils literal notranslate"><span class="pre">True</span></code> if the real or imaginary part of x is not a number (NaN).</p> <div class="versionadded"> <p><span class="versionmodified">New in version 2.6.</span></p> </div> </dd></dl> </div> <div class="section" id="constants"> <h2>9.3.6. Constants<a class="headerlink" href="#constants" title="Permalink to this headline">¶</a></h2> <dl class="data"> <dt id="cmath.pi"> <code class="descclassname">cmath.</code><code class="descname">pi</code><a class="headerlink" href="#cmath.pi" title="Permalink to this definition">¶</a></dt> <dd><p>The mathematical constant <em>π</em>, as a float.</p> </dd></dl> <dl class="data"> <dt id="cmath.e"> <code class="descclassname">cmath.</code><code class="descname">e</code><a class="headerlink" href="#cmath.e" title="Permalink to this definition">¶</a></dt> <dd><p>The mathematical constant <em>e</em>, as a float.</p> </dd></dl> <p id="index-0">Note that the selection of functions is similar, but not identical, to that in module <a class="reference internal" href="math.html#module-math" title="math: Mathematical functions (sin() etc.)."><code class="xref py py-mod docutils literal notranslate"><span class="pre">math</span></code></a>. The reason for having two modules is that some users aren’t interested in complex numbers, and perhaps don’t even know what they are. They would rather have <code class="docutils literal notranslate"><span class="pre">math.sqrt(-1)</span></code> raise an exception than return a complex number. Also note that the functions defined in <a class="reference internal" href="#module-cmath" title="cmath: Mathematical functions for complex numbers."><code class="xref py py-mod docutils literal notranslate"><span class="pre">cmath</span></code></a> always return a complex number, even if the answer can be expressed as a real number (in which case the complex number has an imaginary part of zero).</p> <p>A note on branch cuts: They are curves along which the given function fails to be continuous. They are a necessary feature of many complex functions. It is assumed that if you need to compute with complex functions, you will understand about branch cuts. Consult almost any (not too elementary) book on complex variables for enlightenment. For information of the proper choice of branch cuts for numerical purposes, a good reference should be the following:</p> <div class="admonition seealso"> <p class="first admonition-title">See also</p> <p class="last">Kahan, W: Branch cuts for complex elementary functions; or, Much ado about nothing’s sign bit. In Iserles, A., and Powell, M. (eds.), The state of the art in numerical analysis. Clarendon Press (1987) pp165–211.</p> </div> </div> </div> </div> </div> </div> <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> <div class="sphinxsidebarwrapper"> <h3><a href="../contents.html">Table Of Contents</a></h3> <ul> <li><a class="reference internal" href="#">9.3. <code class="docutils literal notranslate"><span class="pre">cmath</span></code> — Mathematical functions for complex numbers</a><ul> <li><a class="reference internal" href="#conversions-to-and-from-polar-coordinates">9.3.1. Conversions to and from polar coordinates</a></li> <li><a class="reference internal" href="#power-and-logarithmic-functions">9.3.2. Power and logarithmic functions</a></li> <li><a class="reference internal" href="#trigonometric-functions">9.3.3. Trigonometric functions</a></li> <li><a class="reference internal" href="#hyperbolic-functions">9.3.4. Hyperbolic functions</a></li> <li><a class="reference internal" href="#classification-functions">9.3.5. Classification functions</a></li> <li><a class="reference internal" href="#constants">9.3.6. Constants</a></li> </ul> </li> </ul> <h4>Previous topic</h4> <p class="topless"><a href="math.html" title="previous chapter">9.2. <code class="docutils literal notranslate"><span class="pre">math</span></code> — Mathematical functions</a></p> <h4>Next topic</h4> <p class="topless"><a href="decimal.html" title="next chapter">9.4. <code class="docutils literal notranslate"><span class="pre">decimal</span></code> — Decimal fixed point and floating point arithmetic</a></p> <div role="note" aria-label="source link"> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../_sources/library/cmath.rst.txt" rel="nofollow">Show Source</a></li> </ul> </div> <div id="searchbox" style="display: none" role="search"> <h3>Quick search</h3> <div class="searchformwrapper"> <form class="search" action="../search.html" method="get"> <input type="text" name="q" /> <input type="submit" value="Go" /> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form> </div> </div> <script type="text/javascript">$('#searchbox').show(0);</script> </div> </div> <div class="clearer"></div> </div> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" >index</a></li> <li class="right" > <a href="../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="decimal.html" title="9.4. decimal — Decimal fixed point and floating point arithmetic" >next</a> |</li> <li class="right" > <a href="math.html" title="9.2. math — Mathematical functions" >previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="https://www.python.org/">Python</a> »</li> <li> <a href="../index.html">Python 2.7.16 documentation</a> » </li> <li class="nav-item nav-item-1"><a href="index.html" >The Python Standard Library</a> »</li> <li class="nav-item nav-item-2"><a href="numeric.html" >9. 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