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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>9.2. math — Mathematical functions — 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="9.3. cmath — Mathematical functions for complex numbers" href="cmath.html" /> <link rel="prev" title="9.1. numbers — Numeric abstract base classes" href="numbers.html" /> <link rel="shortcut icon" type="image/png" href="../_static/py.png" /> <link rel="canonical" href="https://docs.python.org/2/library/math.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="cmath.html" title="9.3. cmath — Mathematical functions for complex numbers" accesskey="N">next</a> |</li> <li class="right" > <a href="numbers.html" title="9.1. numbers — Numeric abstract base classes" 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-math"> <span id="math-mathematical-functions"></span><h1>9.2. <a class="reference internal" href="#module-math" title="math: Mathematical functions (sin() etc.)."><code class="xref py py-mod docutils literal notranslate"><span class="pre">math</span></code></a> — Mathematical functions<a class="headerlink" href="#module-math" title="Permalink to this headline">¶</a></h1> <p>This module is always available. It provides access to the mathematical functions defined by the C standard.</p> <p>These functions cannot be used with complex numbers; use the functions of the same name from the <a class="reference internal" href="cmath.html#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 if you require support for complex numbers. The distinction between functions which support complex numbers and those which don’t is made since most users do not want to learn quite as much mathematics as required to understand complex numbers. Receiving an exception instead of a complex result allows earlier detection of the unexpected complex number used as a parameter, so that the programmer can determine how and why it was generated in the first place.</p> <p>The following functions are provided by this module. Except when explicitly noted otherwise, all return values are floats.</p> <div class="section" id="number-theoretic-and-representation-functions"> <h2>9.2.1. Number-theoretic and representation functions<a class="headerlink" href="#number-theoretic-and-representation-functions" title="Permalink to this headline">¶</a></h2> <dl class="function"> <dt id="math.ceil"> <code class="descclassname">math.</code><code class="descname">ceil</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#math.ceil" title="Permalink to this definition">¶</a></dt> <dd><p>Return the ceiling of <em>x</em> as a float, the smallest integer value greater than or equal to <em>x</em>.</p> </dd></dl> <dl class="function"> <dt id="math.copysign"> <code class="descclassname">math.</code><code class="descname">copysign</code><span class="sig-paren">(</span><em>x</em>, <em>y</em><span class="sig-paren">)</span><a class="headerlink" href="#math.copysign" title="Permalink to this definition">¶</a></dt> <dd><p>Return <em>x</em> with the sign of <em>y</em>. On a platform that supports signed zeros, <code class="docutils literal notranslate"><span class="pre">copysign(1.0,</span> <span class="pre">-0.0)</span></code> returns <em>-1.0</em>.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 2.6.</span></p> </div> </dd></dl> <dl class="function"> <dt id="math.fabs"> <code class="descclassname">math.</code><code class="descname">fabs</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#math.fabs" title="Permalink to this definition">¶</a></dt> <dd><p>Return the absolute value of <em>x</em>.</p> </dd></dl> <dl class="function"> <dt id="math.factorial"> <code class="descclassname">math.</code><code class="descname">factorial</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#math.factorial" title="Permalink to this definition">¶</a></dt> <dd><p>Return <em>x</em> factorial. Raises <a class="reference internal" href="exceptions.html#exceptions.ValueError" title="exceptions.ValueError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">ValueError</span></code></a> if <em>x</em> is not integral or is negative.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 2.6.</span></p> </div> </dd></dl> <dl class="function"> <dt id="math.floor"> <code class="descclassname">math.</code><code class="descname">floor</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#math.floor" title="Permalink to this definition">¶</a></dt> <dd><p>Return the floor of <em>x</em> as a float, the largest integer value less than or equal to <em>x</em>.</p> </dd></dl> <dl class="function"> <dt id="math.fmod"> <code class="descclassname">math.</code><code class="descname">fmod</code><span class="sig-paren">(</span><em>x</em>, <em>y</em><span class="sig-paren">)</span><a class="headerlink" href="#math.fmod" title="Permalink to this definition">¶</a></dt> <dd><p>Return <code class="docutils literal notranslate"><span class="pre">fmod(x,</span> <span class="pre">y)</span></code>, as defined by the platform C library. Note that the Python expression <code class="docutils literal notranslate"><span class="pre">x</span> <span class="pre">%</span> <span class="pre">y</span></code> may not return the same result. The intent of the C standard is that <code class="docutils literal notranslate"><span class="pre">fmod(x,</span> <span class="pre">y)</span></code> be exactly (mathematically; to infinite precision) equal to <code class="docutils literal notranslate"><span class="pre">x</span> <span class="pre">-</span> <span class="pre">n*y</span></code> for some integer <em>n</em> such that the result has the same sign as <em>x</em> and magnitude less than <code class="docutils literal notranslate"><span class="pre">abs(y)</span></code>. Python’s <code class="docutils literal notranslate"><span class="pre">x</span> <span class="pre">%</span> <span class="pre">y</span></code> returns a result with the sign of <em>y</em> instead, and may not be exactly computable for float arguments. For example, <code class="docutils literal notranslate"><span class="pre">fmod(-1e-100,</span> <span class="pre">1e100)</span></code> is <code class="docutils literal notranslate"><span class="pre">-1e-100</span></code>, but the result of Python’s <code class="docutils literal notranslate"><span class="pre">-1e-100</span> <span class="pre">%</span> <span class="pre">1e100</span></code> is <code class="docutils literal notranslate"><span class="pre">1e100-1e-100</span></code>, which cannot be represented exactly as a float, and rounds to the surprising <code class="docutils literal notranslate"><span class="pre">1e100</span></code>. For this reason, function <a class="reference internal" href="#math.fmod" title="math.fmod"><code class="xref py py-func docutils literal notranslate"><span class="pre">fmod()</span></code></a> is generally preferred when working with floats, while Python’s <code class="docutils literal notranslate"><span class="pre">x</span> <span class="pre">%</span> <span class="pre">y</span></code> is preferred when working with integers.</p> </dd></dl> <dl class="function"> <dt id="math.frexp"> <code class="descclassname">math.</code><code class="descname">frexp</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#math.frexp" title="Permalink to this definition">¶</a></dt> <dd><p>Return the mantissa and exponent of <em>x</em> as the pair <code class="docutils literal notranslate"><span class="pre">(m,</span> <span class="pre">e)</span></code>. <em>m</em> is a float and <em>e</em> is an integer such that <code class="docutils literal notranslate"><span class="pre">x</span> <span class="pre">==</span> <span class="pre">m</span> <span class="pre">*</span> <span class="pre">2**e</span></code> exactly. If <em>x</em> is zero, returns <code class="docutils literal notranslate"><span class="pre">(0.0,</span> <span class="pre">0)</span></code>, otherwise <code class="docutils literal notranslate"><span class="pre">0.5</span> <span class="pre"><=</span> <span class="pre">abs(m)</span> <span class="pre"><</span> <span class="pre">1</span></code>. This is used to “pick apart” the internal representation of a float in a portable way.</p> </dd></dl> <dl class="function"> <dt id="math.fsum"> <code class="descclassname">math.</code><code class="descname">fsum</code><span class="sig-paren">(</span><em>iterable</em><span class="sig-paren">)</span><a class="headerlink" href="#math.fsum" title="Permalink to this definition">¶</a></dt> <dd><p>Return an accurate floating point sum of values in the iterable. Avoids loss of precision by tracking multiple intermediate partial sums:</p> <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="nb">sum</span><span class="p">([</span><span class="o">.</span><span class="mi">1</span><span class="p">,</span> <span class="o">.</span><span class="mi">1</span><span class="p">,</span> <span class="o">.</span><span class="mi">1</span><span class="p">,</span> <span class="o">.</span><span class="mi">1</span><span class="p">,</span> <span class="o">.</span><span class="mi">1</span><span class="p">,</span> <span class="o">.</span><span class="mi">1</span><span class="p">,</span> <span class="o">.</span><span class="mi">1</span><span class="p">,</span> <span class="o">.</span><span class="mi">1</span><span class="p">,</span> <span class="o">.</span><span class="mi">1</span><span class="p">,</span> <span class="o">.</span><span class="mi">1</span><span class="p">])</span> <span class="go">0.9999999999999999</span> <span class="gp">>>> </span><span class="n">fsum</span><span class="p">([</span><span class="o">.</span><span class="mi">1</span><span class="p">,</span> <span class="o">.</span><span class="mi">1</span><span class="p">,</span> <span class="o">.</span><span class="mi">1</span><span class="p">,</span> <span class="o">.</span><span class="mi">1</span><span class="p">,</span> <span class="o">.</span><span class="mi">1</span><span class="p">,</span> <span class="o">.</span><span class="mi">1</span><span class="p">,</span> <span class="o">.</span><span class="mi">1</span><span class="p">,</span> <span class="o">.</span><span class="mi">1</span><span class="p">,</span> <span class="o">.</span><span class="mi">1</span><span class="p">,</span> <span class="o">.</span><span class="mi">1</span><span class="p">])</span> <span class="go">1.0</span> </pre></div> </div> <p>The algorithm’s accuracy depends on IEEE-754 arithmetic guarantees and the typical case where the rounding mode is half-even. On some non-Windows builds, the underlying C library uses extended precision addition and may occasionally double-round an intermediate sum causing it to be off in its least significant bit.</p> <p>For further discussion and two alternative approaches, see the <a class="reference external" href="https://code.activestate.com/recipes/393090/">ASPN cookbook recipes for accurate floating point summation</a>.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 2.6.</span></p> </div> </dd></dl> <dl class="function"> <dt id="math.isinf"> <code class="descclassname">math.</code><code class="descname">isinf</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#math.isinf" title="Permalink to this definition">¶</a></dt> <dd><p>Check if the float <em>x</em> 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="math.isnan"> <code class="descclassname">math.</code><code class="descname">isnan</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#math.isnan" title="Permalink to this definition">¶</a></dt> <dd><p>Check if the float <em>x</em> is a NaN (not a number). For more information on NaNs, see the IEEE 754 standards.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 2.6.</span></p> </div> </dd></dl> <dl class="function"> <dt id="math.ldexp"> <code class="descclassname">math.</code><code class="descname">ldexp</code><span class="sig-paren">(</span><em>x</em>, <em>i</em><span class="sig-paren">)</span><a class="headerlink" href="#math.ldexp" title="Permalink to this definition">¶</a></dt> <dd><p>Return <code class="docutils literal notranslate"><span class="pre">x</span> <span class="pre">*</span> <span class="pre">(2**i)</span></code>. This is essentially the inverse of function <a class="reference internal" href="#math.frexp" title="math.frexp"><code class="xref py py-func docutils literal notranslate"><span class="pre">frexp()</span></code></a>.</p> </dd></dl> <dl class="function"> <dt id="math.modf"> <code class="descclassname">math.</code><code class="descname">modf</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#math.modf" title="Permalink to this definition">¶</a></dt> <dd><p>Return the fractional and integer parts of <em>x</em>. Both results carry the sign of <em>x</em> and are floats.</p> </dd></dl> <dl class="function"> <dt id="math.trunc"> <code class="descclassname">math.</code><code class="descname">trunc</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#math.trunc" title="Permalink to this definition">¶</a></dt> <dd><p>Return the <a class="reference internal" href="numbers.html#numbers.Real" title="numbers.Real"><code class="xref py py-class docutils literal notranslate"><span class="pre">Real</span></code></a> value <em>x</em> truncated to an <a class="reference internal" href="numbers.html#numbers.Integral" title="numbers.Integral"><code class="xref py py-class docutils literal notranslate"><span class="pre">Integral</span></code></a> (usually a long integer). Uses the <code class="docutils literal notranslate"><span class="pre">__trunc__</span></code> method.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 2.6.</span></p> </div> </dd></dl> <p>Note that <a class="reference internal" href="#math.frexp" title="math.frexp"><code class="xref py py-func docutils literal notranslate"><span class="pre">frexp()</span></code></a> and <a class="reference internal" href="#math.modf" title="math.modf"><code class="xref py py-func docutils literal notranslate"><span class="pre">modf()</span></code></a> have a different call/return pattern than their C equivalents: they take a single argument and return a pair of values, rather than returning their second return value through an ‘output parameter’ (there is no such thing in Python).</p> <p>For the <a class="reference internal" href="#math.ceil" title="math.ceil"><code class="xref py py-func docutils literal notranslate"><span class="pre">ceil()</span></code></a>, <a class="reference internal" href="#math.floor" title="math.floor"><code class="xref py py-func docutils literal notranslate"><span class="pre">floor()</span></code></a>, and <a class="reference internal" href="#math.modf" title="math.modf"><code class="xref py py-func docutils literal notranslate"><span class="pre">modf()</span></code></a> functions, note that <em>all</em> floating-point numbers of sufficiently large magnitude are exact integers. Python floats typically carry no more than 53 bits of precision (the same as the platform C double type), in which case any float <em>x</em> with <code class="docutils literal notranslate"><span class="pre">abs(x)</span> <span class="pre">>=</span> <span class="pre">2**52</span></code> necessarily has no fractional bits.</p> </div> <div class="section" id="power-and-logarithmic-functions"> <h2>9.2.2. Power and logarithmic functions<a class="headerlink" href="#power-and-logarithmic-functions" title="Permalink to this headline">¶</a></h2> <dl class="function"> <dt id="math.exp"> <code class="descclassname">math.</code><code class="descname">exp</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#math.exp" title="Permalink to this definition">¶</a></dt> <dd><p>Return <code class="docutils literal notranslate"><span class="pre">e**x</span></code>.</p> </dd></dl> <dl class="function"> <dt id="math.expm1"> <code class="descclassname">math.</code><code class="descname">expm1</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#math.expm1" title="Permalink to this definition">¶</a></dt> <dd><p>Return <code class="docutils literal notranslate"><span class="pre">e**x</span> <span class="pre">-</span> <span class="pre">1</span></code>. For small floats <em>x</em>, the subtraction in <code class="docutils literal notranslate"><span class="pre">exp(x)</span> <span class="pre">-</span> <span class="pre">1</span></code> can result in a significant loss of precision; the <a class="reference internal" href="#math.expm1" title="math.expm1"><code class="xref py py-func docutils literal notranslate"><span class="pre">expm1()</span></code></a> function provides a way to compute this quantity to full precision:</p> <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">from</span> <span class="nn">math</span> <span class="k">import</span> <span class="n">exp</span><span class="p">,</span> <span class="n">expm1</span> <span class="gp">>>> </span><span class="n">exp</span><span class="p">(</span><span class="mf">1e-5</span><span class="p">)</span> <span class="o">-</span> <span class="mi">1</span> <span class="c1"># gives result accurate to 11 places</span> <span class="go">1.0000050000069649e-05</span> <span class="gp">>>> </span><span class="n">expm1</span><span class="p">(</span><span class="mf">1e-5</span><span class="p">)</span> <span class="c1"># result accurate to full precision</span> <span class="go">1.0000050000166668e-05</span> </pre></div> </div> <div class="versionadded"> <p><span class="versionmodified">New in version 2.7.</span></p> </div> </dd></dl> <dl class="function"> <dt id="math.log"> <code class="descclassname">math.</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="#math.log" title="Permalink to this definition">¶</a></dt> <dd><p>With one argument, return the natural logarithm of <em>x</em> (to base <em>e</em>).</p> <p>With two arguments, return the logarithm of <em>x</em> to the given <em>base</em>, calculated as <code class="docutils literal notranslate"><span class="pre">log(x)/log(base)</span></code>.</p> <div class="versionchanged"> <p><span class="versionmodified">Changed in version 2.3: </span><em>base</em> argument added.</p> </div> </dd></dl> <dl class="function"> <dt id="math.log1p"> <code class="descclassname">math.</code><code class="descname">log1p</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#math.log1p" title="Permalink to this definition">¶</a></dt> <dd><p>Return the natural logarithm of <em>1+x</em> (base <em>e</em>). The result is calculated in a way which is accurate for <em>x</em> near zero.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 2.6.</span></p> </div> </dd></dl> <dl class="function"> <dt id="math.log10"> <code class="descclassname">math.</code><code class="descname">log10</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#math.log10" title="Permalink to this definition">¶</a></dt> <dd><p>Return the base-10 logarithm of <em>x</em>. This is usually more accurate than <code class="docutils literal notranslate"><span class="pre">log(x,</span> <span class="pre">10)</span></code>.</p> </dd></dl> <dl class="function"> <dt id="math.pow"> <code class="descclassname">math.</code><code class="descname">pow</code><span class="sig-paren">(</span><em>x</em>, <em>y</em><span class="sig-paren">)</span><a class="headerlink" href="#math.pow" title="Permalink to this definition">¶</a></dt> <dd><p>Return <code class="docutils literal notranslate"><span class="pre">x</span></code> raised to the power <code class="docutils literal notranslate"><span class="pre">y</span></code>. Exceptional cases follow Annex ‘F’ of the C99 standard as far as possible. In particular, <code class="docutils literal notranslate"><span class="pre">pow(1.0,</span> <span class="pre">x)</span></code> and <code class="docutils literal notranslate"><span class="pre">pow(x,</span> <span class="pre">0.0)</span></code> always return <code class="docutils literal notranslate"><span class="pre">1.0</span></code>, even when <code class="docutils literal notranslate"><span class="pre">x</span></code> is a zero or a NaN. If both <code class="docutils literal notranslate"><span class="pre">x</span></code> and <code class="docutils literal notranslate"><span class="pre">y</span></code> are finite, <code class="docutils literal notranslate"><span class="pre">x</span></code> is negative, and <code class="docutils literal notranslate"><span class="pre">y</span></code> is not an integer then <code class="docutils literal notranslate"><span class="pre">pow(x,</span> <span class="pre">y)</span></code> is undefined, and raises <a class="reference internal" href="exceptions.html#exceptions.ValueError" title="exceptions.ValueError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">ValueError</span></code></a>.</p> <p>Unlike the built-in <code class="docutils literal notranslate"><span class="pre">**</span></code> operator, <a class="reference internal" href="#math.pow" title="math.pow"><code class="xref py py-func docutils literal notranslate"><span class="pre">math.pow()</span></code></a> converts both its arguments to type <a class="reference internal" href="functions.html#float" title="float"><code class="xref py py-class docutils literal notranslate"><span class="pre">float</span></code></a>. Use <code class="docutils literal notranslate"><span class="pre">**</span></code> or the built-in <a class="reference internal" href="functions.html#pow" title="pow"><code class="xref py py-func docutils literal notranslate"><span class="pre">pow()</span></code></a> function for computing exact integer powers.</p> <div class="versionchanged"> <p><span class="versionmodified">Changed in version 2.6: </span>The outcome of <code class="docutils literal notranslate"><span class="pre">1**nan</span></code> and <code class="docutils literal notranslate"><span class="pre">nan**0</span></code> was undefined.</p> </div> </dd></dl> <dl class="function"> <dt id="math.sqrt"> <code class="descclassname">math.</code><code class="descname">sqrt</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#math.sqrt" title="Permalink to this definition">¶</a></dt> <dd><p>Return the square root of <em>x</em>.</p> </dd></dl> </div> <div class="section" id="trigonometric-functions"> <h2>9.2.3. Trigonometric functions<a class="headerlink" href="#trigonometric-functions" title="Permalink to this headline">¶</a></h2> <dl class="function"> <dt id="math.acos"> <code class="descclassname">math.</code><code class="descname">acos</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#math.acos" title="Permalink to this definition">¶</a></dt> <dd><p>Return the arc cosine of <em>x</em>, in radians.</p> </dd></dl> <dl class="function"> <dt id="math.asin"> <code class="descclassname">math.</code><code class="descname">asin</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#math.asin" title="Permalink to this definition">¶</a></dt> <dd><p>Return the arc sine of <em>x</em>, in radians.</p> </dd></dl> <dl class="function"> <dt id="math.atan"> <code class="descclassname">math.</code><code class="descname">atan</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#math.atan" title="Permalink to this definition">¶</a></dt> <dd><p>Return the arc tangent of <em>x</em>, in radians.</p> </dd></dl> <dl class="function"> <dt id="math.atan2"> <code class="descclassname">math.</code><code class="descname">atan2</code><span class="sig-paren">(</span><em>y</em>, <em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#math.atan2" title="Permalink to this definition">¶</a></dt> <dd><p>Return <code class="docutils literal notranslate"><span class="pre">atan(y</span> <span class="pre">/</span> <span class="pre">x)</span></code>, in radians. The result is between <code class="docutils literal notranslate"><span class="pre">-pi</span></code> and <code class="docutils literal notranslate"><span class="pre">pi</span></code>. The vector in the plane from the origin to point <code class="docutils literal notranslate"><span class="pre">(x,</span> <span class="pre">y)</span></code> makes this angle with the positive X axis. The point of <a class="reference internal" href="#math.atan2" title="math.atan2"><code class="xref py py-func docutils literal notranslate"><span class="pre">atan2()</span></code></a> is that the signs of both inputs are known to it, so it can compute the correct quadrant for the angle. For example, <code class="docutils literal notranslate"><span class="pre">atan(1)</span></code> and <code class="docutils literal notranslate"><span class="pre">atan2(1,</span> <span class="pre">1)</span></code> are both <code class="docutils literal notranslate"><span class="pre">pi/4</span></code>, but <code class="docutils literal notranslate"><span class="pre">atan2(-1,</span> <span class="pre">-1)</span></code> is <code class="docutils literal notranslate"><span class="pre">-3*pi/4</span></code>.</p> </dd></dl> <dl class="function"> <dt id="math.cos"> <code class="descclassname">math.</code><code class="descname">cos</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#math.cos" title="Permalink to this definition">¶</a></dt> <dd><p>Return the cosine of <em>x</em> radians.</p> </dd></dl> <dl class="function"> <dt id="math.hypot"> <code class="descclassname">math.</code><code class="descname">hypot</code><span class="sig-paren">(</span><em>x</em>, <em>y</em><span class="sig-paren">)</span><a class="headerlink" href="#math.hypot" title="Permalink to this definition">¶</a></dt> <dd><p>Return the Euclidean norm, <code class="docutils literal notranslate"><span class="pre">sqrt(x*x</span> <span class="pre">+</span> <span class="pre">y*y)</span></code>. This is the length of the vector from the origin to point <code class="docutils literal notranslate"><span class="pre">(x,</span> <span class="pre">y)</span></code>.</p> </dd></dl> <dl class="function"> <dt id="math.sin"> <code class="descclassname">math.</code><code class="descname">sin</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#math.sin" title="Permalink to this definition">¶</a></dt> <dd><p>Return the sine of <em>x</em> radians.</p> </dd></dl> <dl class="function"> <dt id="math.tan"> <code class="descclassname">math.</code><code class="descname">tan</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#math.tan" title="Permalink to this definition">¶</a></dt> <dd><p>Return the tangent of <em>x</em> radians.</p> </dd></dl> </div> <div class="section" id="angular-conversion"> <h2>9.2.4. Angular conversion<a class="headerlink" href="#angular-conversion" title="Permalink to this headline">¶</a></h2> <dl class="function"> <dt id="math.degrees"> <code class="descclassname">math.</code><code class="descname">degrees</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#math.degrees" title="Permalink to this definition">¶</a></dt> <dd><p>Convert angle <em>x</em> from radians to degrees.</p> </dd></dl> <dl class="function"> <dt id="math.radians"> <code class="descclassname">math.</code><code class="descname">radians</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#math.radians" title="Permalink to this definition">¶</a></dt> <dd><p>Convert angle <em>x</em> from degrees to radians.</p> </dd></dl> </div> <div class="section" id="hyperbolic-functions"> <h2>9.2.5. Hyperbolic functions<a class="headerlink" href="#hyperbolic-functions" title="Permalink to this headline">¶</a></h2> <dl class="function"> <dt id="math.acosh"> <code class="descclassname">math.</code><code class="descname">acosh</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#math.acosh" title="Permalink to this definition">¶</a></dt> <dd><p>Return the inverse hyperbolic cosine of <em>x</em>.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 2.6.</span></p> </div> </dd></dl> <dl class="function"> <dt id="math.asinh"> <code class="descclassname">math.</code><code class="descname">asinh</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#math.asinh" title="Permalink to this definition">¶</a></dt> <dd><p>Return the inverse hyperbolic sine of <em>x</em>.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 2.6.</span></p> </div> </dd></dl> <dl class="function"> <dt id="math.atanh"> <code class="descclassname">math.</code><code class="descname">atanh</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#math.atanh" title="Permalink to this definition">¶</a></dt> <dd><p>Return the inverse hyperbolic tangent of <em>x</em>.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 2.6.</span></p> </div> </dd></dl> <dl class="function"> <dt id="math.cosh"> <code class="descclassname">math.</code><code class="descname">cosh</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#math.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="math.sinh"> <code class="descclassname">math.</code><code class="descname">sinh</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#math.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="math.tanh"> <code class="descclassname">math.</code><code class="descname">tanh</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#math.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="special-functions"> <h2>9.2.6. Special functions<a class="headerlink" href="#special-functions" title="Permalink to this headline">¶</a></h2> <dl class="function"> <dt id="math.erf"> <code class="descclassname">math.</code><code class="descname">erf</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#math.erf" title="Permalink to this definition">¶</a></dt> <dd><p>Return the error function at <em>x</em>.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 2.7.</span></p> </div> </dd></dl> <dl class="function"> <dt id="math.erfc"> <code class="descclassname">math.</code><code class="descname">erfc</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#math.erfc" title="Permalink to this definition">¶</a></dt> <dd><p>Return the complementary error function at <em>x</em>.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 2.7.</span></p> </div> </dd></dl> <dl class="function"> <dt id="math.gamma"> <code class="descclassname">math.</code><code class="descname">gamma</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#math.gamma" title="Permalink to this definition">¶</a></dt> <dd><p>Return the Gamma function at <em>x</em>.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 2.7.</span></p> </div> </dd></dl> <dl class="function"> <dt id="math.lgamma"> <code class="descclassname">math.</code><code class="descname">lgamma</code><span class="sig-paren">(</span><em>x</em><span class="sig-paren">)</span><a class="headerlink" href="#math.lgamma" title="Permalink to this definition">¶</a></dt> <dd><p>Return the natural logarithm of the absolute value of the Gamma function at <em>x</em>.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 2.7.</span></p> </div> </dd></dl> </div> <div class="section" id="constants"> <h2>9.2.7. Constants<a class="headerlink" href="#constants" title="Permalink to this headline">¶</a></h2> <dl class="data"> <dt id="math.pi"> <code class="descclassname">math.</code><code class="descname">pi</code><a class="headerlink" href="#math.pi" title="Permalink to this definition">¶</a></dt> <dd><p>The mathematical constant π = 3.141592…, to available precision.</p> </dd></dl> <dl class="data"> <dt id="math.e"> <code class="descclassname">math.</code><code class="descname">e</code><a class="headerlink" href="#math.e" title="Permalink to this definition">¶</a></dt> <dd><p>The mathematical constant e = 2.718281…, to available precision.</p> </dd></dl> <div class="impl-detail compound"> <p class="compound-first"><strong>CPython implementation detail:</strong> The <a class="reference internal" href="#module-math" title="math: Mathematical functions (sin() etc.)."><code class="xref py py-mod docutils literal notranslate"><span class="pre">math</span></code></a> module consists mostly of thin wrappers around the platform C math library functions. Behavior in exceptional cases follows Annex F of the C99 standard where appropriate. The current implementation will raise <a class="reference internal" href="exceptions.html#exceptions.ValueError" title="exceptions.ValueError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">ValueError</span></code></a> for invalid operations like <code class="docutils literal notranslate"><span class="pre">sqrt(-1.0)</span></code> or <code class="docutils literal notranslate"><span class="pre">log(0.0)</span></code> (where C99 Annex F recommends signaling invalid operation or divide-by-zero), and <a class="reference internal" href="exceptions.html#exceptions.OverflowError" title="exceptions.OverflowError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">OverflowError</span></code></a> for results that overflow (for example, <code class="docutils literal notranslate"><span class="pre">exp(1000.0)</span></code>). A NaN will not be returned from any of the functions above unless one or more of the input arguments was a NaN; in that case, most functions will return a NaN, but (again following C99 Annex F) there are some exceptions to this rule, for example <code class="docutils literal notranslate"><span class="pre">pow(float('nan'),</span> <span class="pre">0.0)</span></code> or <code class="docutils literal notranslate"><span class="pre">hypot(float('nan'),</span> <span class="pre">float('inf'))</span></code>.</p> <p class="compound-middle">Note that Python makes no effort to distinguish signaling NaNs from quiet NaNs, and behavior for signaling NaNs remains unspecified. Typical behavior is to treat all NaNs as though they were quiet.</p> <div class="compound-last versionchanged"> <p><span class="versionmodified">Changed in version 2.6: </span>Behavior in special cases now aims to follow C99 Annex F. In earlier versions of Python the behavior in special cases was loosely specified.</p> </div> </div> <div class="admonition seealso"> <p class="first admonition-title">See also</p> <dl class="last docutils"> <dt>Module <a class="reference internal" href="cmath.html#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></dt> <dd>Complex number versions of many of these functions.</dd> </dl> </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="#">9.2. <code class="docutils literal notranslate"><span class="pre">math</span></code> — Mathematical functions</a><ul> <li><a class="reference internal" href="#number-theoretic-and-representation-functions">9.2.1. Number-theoretic and representation functions</a></li> <li><a class="reference internal" href="#power-and-logarithmic-functions">9.2.2. Power and logarithmic functions</a></li> <li><a class="reference internal" href="#trigonometric-functions">9.2.3. Trigonometric functions</a></li> <li><a class="reference internal" href="#angular-conversion">9.2.4. Angular conversion</a></li> <li><a class="reference internal" href="#hyperbolic-functions">9.2.5. Hyperbolic functions</a></li> <li><a class="reference internal" href="#special-functions">9.2.6. Special functions</a></li> <li><a class="reference internal" href="#constants">9.2.7. Constants</a></li> </ul> </li> </ul> <h4>Previous topic</h4> <p class="topless"><a href="numbers.html" title="previous chapter">9.1. <code class="docutils literal notranslate"><span class="pre">numbers</span></code> — Numeric abstract base classes</a></p> <h4>Next topic</h4> <p class="topless"><a href="cmath.html" title="next chapter">9.3. <code class="docutils literal notranslate"><span class="pre">cmath</span></code> — Mathematical functions for complex numbers</a></p> <div role="note" aria-label="source link"> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../_sources/library/math.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="cmath.html" title="9.3. cmath — Mathematical functions for complex numbers" >next</a> |</li> <li class="right" > <a href="numbers.html" title="9.1. numbers — Numeric abstract base classes" >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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