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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>6. Built-in Exceptions — 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="7. String Services" href="strings.html" /> <link rel="prev" title="5. Built-in Types" href="stdtypes.html" /> <link rel="shortcut icon" type="image/png" href="../_static/py.png" /> <link rel="canonical" href="https://docs.python.org/2/library/exceptions.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="strings.html" title="7. String Services" accesskey="N">next</a> |</li> <li class="right" > <a href="stdtypes.html" title="5. Built-in Types" 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" accesskey="U">The Python Standard Library</a> »</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body" role="main"> <div class="section" id="module-exceptions"> <span id="built-in-exceptions"></span><span id="bltin-exceptions"></span><h1>6. Built-in Exceptions<a class="headerlink" href="#module-exceptions" title="Permalink to this headline">¶</a></h1> <p>Exceptions should be class objects. The exceptions are defined in the module <a class="reference internal" href="#module-exceptions" title="exceptions: Standard exception classes."><code class="xref py py-mod docutils literal notranslate"><span class="pre">exceptions</span></code></a>. This module never needs to be imported explicitly: the exceptions are provided in the built-in namespace as well as the <a class="reference internal" href="#module-exceptions" title="exceptions: Standard exception classes."><code class="xref py py-mod docutils literal notranslate"><span class="pre">exceptions</span></code></a> module.</p> <p id="index-0">For class exceptions, in a <a class="reference internal" href="../reference/compound_stmts.html#try"><code class="xref std std-keyword docutils literal notranslate"><span class="pre">try</span></code></a> statement with an <a class="reference internal" href="../reference/compound_stmts.html#except"><code class="xref std std-keyword docutils literal notranslate"><span class="pre">except</span></code></a> clause that mentions a particular class, that clause also handles any exception classes derived from that class (but not exception classes from which <em>it</em> is derived). Two exception classes that are not related via subclassing are never equivalent, even if they have the same name.</p> <p id="index-1">The built-in exceptions listed below can be generated by the interpreter or built-in functions. Except where mentioned, they have an “associated value” indicating the detailed cause of the error. This may be a string or a tuple containing several items of information (e.g., an error code and a string explaining the code). The associated value is the second argument to the <a class="reference internal" href="../reference/simple_stmts.html#raise"><code class="xref std std-keyword docutils literal notranslate"><span class="pre">raise</span></code></a> statement. If the exception class is derived from the standard root class <a class="reference internal" href="#exceptions.BaseException" title="exceptions.BaseException"><code class="xref py py-exc docutils literal notranslate"><span class="pre">BaseException</span></code></a>, the associated value is present as the exception instance’s <code class="xref py py-attr docutils literal notranslate"><span class="pre">args</span></code> attribute.</p> <p>User code can raise built-in exceptions. This can be used to test an exception handler or to report an error condition “just like” the situation in which the interpreter raises the same exception; but beware that there is nothing to prevent user code from raising an inappropriate error.</p> <p>The built-in exception classes can be subclassed to define new exceptions; programmers are encouraged to derive new exceptions from the <a class="reference internal" href="#exceptions.Exception" title="exceptions.Exception"><code class="xref py py-exc docutils literal notranslate"><span class="pre">Exception</span></code></a> class or one of its subclasses, and not from <a class="reference internal" href="#exceptions.BaseException" title="exceptions.BaseException"><code class="xref py py-exc docutils literal notranslate"><span class="pre">BaseException</span></code></a>. More information on defining exceptions is available in the Python Tutorial under <a class="reference internal" href="../tutorial/errors.html#tut-userexceptions"><span class="std std-ref">User-defined Exceptions</span></a>.</p> <p>The following exceptions are only used as base classes for other exceptions.</p> <dl class="exception"> <dt id="exceptions.BaseException"> <em class="property">exception </em><code class="descname">BaseException</code><a class="headerlink" href="#exceptions.BaseException" title="Permalink to this definition">¶</a></dt> <dd><p>The base class for all built-in exceptions. It is not meant to be directly inherited by user-defined classes (for that, use <a class="reference internal" href="#exceptions.Exception" title="exceptions.Exception"><code class="xref py py-exc docutils literal notranslate"><span class="pre">Exception</span></code></a>). If <a class="reference internal" href="functions.html#str" title="str"><code class="xref py py-func docutils literal notranslate"><span class="pre">str()</span></code></a> or <a class="reference internal" href="functions.html#unicode" title="unicode"><code class="xref py py-func docutils literal notranslate"><span class="pre">unicode()</span></code></a> is called on an instance of this class, the representation of the argument(s) to the instance are returned, or the empty string when there were no arguments.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 2.5.</span></p> </div> <dl class="attribute"> <dt id="exceptions.BaseException.args"> <code class="descname">args</code><a class="headerlink" href="#exceptions.BaseException.args" title="Permalink to this definition">¶</a></dt> <dd><p>The tuple of arguments given to the exception constructor. Some built-in exceptions (like <a class="reference internal" href="#exceptions.IOError" title="exceptions.IOError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">IOError</span></code></a>) expect a certain number of arguments and assign a special meaning to the elements of this tuple, while others are usually called only with a single string giving an error message.</p> </dd></dl> </dd></dl> <dl class="exception"> <dt id="exceptions.Exception"> <em class="property">exception </em><code class="descname">Exception</code><a class="headerlink" href="#exceptions.Exception" title="Permalink to this definition">¶</a></dt> <dd><p>All built-in, non-system-exiting exceptions are derived from this class. All user-defined exceptions should also be derived from this class.</p> <div class="versionchanged"> <p><span class="versionmodified">Changed in version 2.5: </span>Changed to inherit from <a class="reference internal" href="#exceptions.BaseException" title="exceptions.BaseException"><code class="xref py py-exc docutils literal notranslate"><span class="pre">BaseException</span></code></a>.</p> </div> </dd></dl> <dl class="exception"> <dt id="exceptions.StandardError"> <em class="property">exception </em><code class="descname">StandardError</code><a class="headerlink" href="#exceptions.StandardError" title="Permalink to this definition">¶</a></dt> <dd><p>The base class for all built-in exceptions except <a class="reference internal" href="#exceptions.StopIteration" title="exceptions.StopIteration"><code class="xref py py-exc docutils literal notranslate"><span class="pre">StopIteration</span></code></a>, <a class="reference internal" href="#exceptions.GeneratorExit" title="exceptions.GeneratorExit"><code class="xref py py-exc docutils literal notranslate"><span class="pre">GeneratorExit</span></code></a>, <a class="reference internal" href="#exceptions.KeyboardInterrupt" title="exceptions.KeyboardInterrupt"><code class="xref py py-exc docutils literal notranslate"><span class="pre">KeyboardInterrupt</span></code></a> and <a class="reference internal" href="#exceptions.SystemExit" title="exceptions.SystemExit"><code class="xref py py-exc docutils literal notranslate"><span class="pre">SystemExit</span></code></a>. <a class="reference internal" href="#exceptions.StandardError" title="exceptions.StandardError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">StandardError</span></code></a> itself is derived from <a class="reference internal" href="#exceptions.Exception" title="exceptions.Exception"><code class="xref py py-exc docutils literal notranslate"><span class="pre">Exception</span></code></a>.</p> </dd></dl> <dl class="exception"> <dt id="exceptions.ArithmeticError"> <em class="property">exception </em><code class="descname">ArithmeticError</code><a class="headerlink" href="#exceptions.ArithmeticError" title="Permalink to this definition">¶</a></dt> <dd><p>The base class for those built-in exceptions that are raised for various arithmetic errors: <a class="reference internal" href="#exceptions.OverflowError" title="exceptions.OverflowError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">OverflowError</span></code></a>, <a class="reference internal" href="#exceptions.ZeroDivisionError" title="exceptions.ZeroDivisionError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">ZeroDivisionError</span></code></a>, <a class="reference internal" href="#exceptions.FloatingPointError" title="exceptions.FloatingPointError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">FloatingPointError</span></code></a>.</p> </dd></dl> <dl class="exception"> <dt id="exceptions.BufferError"> <em class="property">exception </em><code class="descname">BufferError</code><a class="headerlink" href="#exceptions.BufferError" title="Permalink to this definition">¶</a></dt> <dd><p>Raised when a <a class="reference internal" href="../c-api/buffer.html#bufferobjects"><span class="std std-ref">buffer</span></a> related operation cannot be performed.</p> </dd></dl> <dl class="exception"> <dt id="exceptions.LookupError"> <em class="property">exception </em><code class="descname">LookupError</code><a class="headerlink" href="#exceptions.LookupError" title="Permalink to this definition">¶</a></dt> <dd><p>The base class for the exceptions that are raised when a key or index used on a mapping or sequence is invalid: <a class="reference internal" href="#exceptions.IndexError" title="exceptions.IndexError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">IndexError</span></code></a>, <a class="reference internal" href="#exceptions.KeyError" title="exceptions.KeyError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">KeyError</span></code></a>. This can be raised directly by <a class="reference internal" href="codecs.html#codecs.lookup" title="codecs.lookup"><code class="xref py py-func docutils literal notranslate"><span class="pre">codecs.lookup()</span></code></a>.</p> </dd></dl> <dl class="exception"> <dt id="exceptions.EnvironmentError"> <em class="property">exception </em><code class="descname">EnvironmentError</code><a class="headerlink" href="#exceptions.EnvironmentError" title="Permalink to this definition">¶</a></dt> <dd><p>The base class for exceptions that can occur outside the Python system: <a class="reference internal" href="#exceptions.IOError" title="exceptions.IOError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">IOError</span></code></a>, <a class="reference internal" href="#exceptions.OSError" title="exceptions.OSError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">OSError</span></code></a>. When exceptions of this type are created with a 2-tuple, the first item is available on the instance’s <a class="reference internal" href="errno.html#module-errno" title="errno: Standard errno system symbols."><code class="xref py py-attr docutils literal notranslate"><span class="pre">errno</span></code></a> attribute (it is assumed to be an error number), and the second item is available on the <code class="xref py py-attr docutils literal notranslate"><span class="pre">strerror</span></code> attribute (it is usually the associated error message). The tuple itself is also available on the <code class="xref py py-attr docutils literal notranslate"><span class="pre">args</span></code> attribute.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 1.5.2.</span></p> </div> <p>When an <a class="reference internal" href="#exceptions.EnvironmentError" title="exceptions.EnvironmentError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">EnvironmentError</span></code></a> exception is instantiated with a 3-tuple, the first two items are available as above, while the third item is available on the <code class="xref py py-attr docutils literal notranslate"><span class="pre">filename</span></code> attribute. However, for backwards compatibility, the <code class="xref py py-attr docutils literal notranslate"><span class="pre">args</span></code> attribute contains only a 2-tuple of the first two constructor arguments.</p> <p>The <code class="xref py py-attr docutils literal notranslate"><span class="pre">filename</span></code> attribute is <code class="docutils literal notranslate"><span class="pre">None</span></code> when this exception is created with other than 3 arguments. The <a class="reference internal" href="errno.html#module-errno" title="errno: Standard errno system symbols."><code class="xref py py-attr docutils literal notranslate"><span class="pre">errno</span></code></a> and <code class="xref py py-attr docutils literal notranslate"><span class="pre">strerror</span></code> attributes are also <code class="docutils literal notranslate"><span class="pre">None</span></code> when the instance was created with other than 2 or 3 arguments. In this last case, <code class="xref py py-attr docutils literal notranslate"><span class="pre">args</span></code> contains the verbatim constructor arguments as a tuple.</p> </dd></dl> <p>The following exceptions are the exceptions that are actually raised.</p> <dl class="exception"> <dt id="exceptions.AssertionError"> <em class="property">exception </em><code class="descname">AssertionError</code><a class="headerlink" href="#exceptions.AssertionError" title="Permalink to this definition">¶</a></dt> <dd><p id="index-2">Raised when an <a class="reference internal" href="../reference/simple_stmts.html#assert"><code class="xref std std-keyword docutils literal notranslate"><span class="pre">assert</span></code></a> statement fails.</p> </dd></dl> <dl class="exception"> <dt id="exceptions.AttributeError"> <em class="property">exception </em><code class="descname">AttributeError</code><a class="headerlink" href="#exceptions.AttributeError" title="Permalink to this definition">¶</a></dt> <dd><p>Raised when an attribute reference (see <a class="reference internal" href="../reference/expressions.html#attribute-references"><span class="std std-ref">Attribute references</span></a>) or assignment fails. (When an object does not support attribute references or attribute assignments at all, <a class="reference internal" href="#exceptions.TypeError" title="exceptions.TypeError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">TypeError</span></code></a> is raised.)</p> </dd></dl> <dl class="exception"> <dt id="exceptions.EOFError"> <em class="property">exception </em><code class="descname">EOFError</code><a class="headerlink" href="#exceptions.EOFError" title="Permalink to this definition">¶</a></dt> <dd><p>Raised when one of the built-in functions (<a class="reference internal" href="functions.html#input" title="input"><code class="xref py py-func docutils literal notranslate"><span class="pre">input()</span></code></a> or <a class="reference internal" href="functions.html#raw_input" title="raw_input"><code class="xref py py-func docutils literal notranslate"><span class="pre">raw_input()</span></code></a>) hits an end-of-file condition (EOF) without reading any data. (N.B.: the <a class="reference internal" href="stdtypes.html#file.read" title="file.read"><code class="xref py py-meth docutils literal notranslate"><span class="pre">file.read()</span></code></a> and <a class="reference internal" href="stdtypes.html#file.readline" title="file.readline"><code class="xref py py-meth docutils literal notranslate"><span class="pre">file.readline()</span></code></a> methods return an empty string when they hit EOF.)</p> </dd></dl> <dl class="exception"> <dt id="exceptions.FloatingPointError"> <em class="property">exception </em><code class="descname">FloatingPointError</code><a class="headerlink" href="#exceptions.FloatingPointError" title="Permalink to this definition">¶</a></dt> <dd><p>Raised when a floating point operation fails. This exception is always defined, but can only be raised when Python is configured with the <code class="docutils literal notranslate"><span class="pre">--with-fpectl</span></code> option, or the <code class="xref py py-const docutils literal notranslate"><span class="pre">WANT_SIGFPE_HANDLER</span></code> symbol is defined in the <code class="file docutils literal notranslate"><span class="pre">pyconfig.h</span></code> file.</p> </dd></dl> <dl class="exception"> <dt id="exceptions.GeneratorExit"> <em class="property">exception </em><code class="descname">GeneratorExit</code><a class="headerlink" href="#exceptions.GeneratorExit" title="Permalink to this definition">¶</a></dt> <dd><p>Raised when a <a class="reference internal" href="../glossary.html#term-generator"><span class="xref std std-term">generator</span></a>’s <code class="xref py py-meth docutils literal notranslate"><span class="pre">close()</span></code> method is called. It directly inherits from <a class="reference internal" href="#exceptions.BaseException" title="exceptions.BaseException"><code class="xref py py-exc docutils literal notranslate"><span class="pre">BaseException</span></code></a> instead of <a class="reference internal" href="#exceptions.StandardError" title="exceptions.StandardError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">StandardError</span></code></a> since it is technically not an error.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 2.5.</span></p> </div> <div class="versionchanged"> <p><span class="versionmodified">Changed in version 2.6: </span>Changed to inherit from <a class="reference internal" href="#exceptions.BaseException" title="exceptions.BaseException"><code class="xref py py-exc docutils literal notranslate"><span class="pre">BaseException</span></code></a>.</p> </div> </dd></dl> <dl class="exception"> <dt id="exceptions.IOError"> <em class="property">exception </em><code class="descname">IOError</code><a class="headerlink" href="#exceptions.IOError" title="Permalink to this definition">¶</a></dt> <dd><p>Raised when an I/O operation (such as a <a class="reference internal" href="../reference/simple_stmts.html#print"><code class="xref std std-keyword docutils literal notranslate"><span class="pre">print</span></code></a> statement, the built-in <a class="reference internal" href="functions.html#open" title="open"><code class="xref py py-func docutils literal notranslate"><span class="pre">open()</span></code></a> function or a method of a file object) fails for an I/O-related reason, e.g., “file not found” or “disk full”.</p> <p>This class is derived from <a class="reference internal" href="#exceptions.EnvironmentError" title="exceptions.EnvironmentError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">EnvironmentError</span></code></a>. See the discussion above for more information on exception instance attributes.</p> <div class="versionchanged"> <p><span class="versionmodified">Changed in version 2.6: </span>Changed <a class="reference internal" href="socket.html#socket.error" title="socket.error"><code class="xref py py-exc docutils literal notranslate"><span class="pre">socket.error</span></code></a> to use this as a base class.</p> </div> </dd></dl> <dl class="exception"> <dt id="exceptions.ImportError"> <em class="property">exception </em><code class="descname">ImportError</code><a class="headerlink" href="#exceptions.ImportError" title="Permalink to this definition">¶</a></dt> <dd><p>Raised when an <a class="reference internal" href="../reference/simple_stmts.html#import"><code class="xref std std-keyword docutils literal notranslate"><span class="pre">import</span></code></a> statement fails to find the module definition or when a <code class="docutils literal notranslate"><span class="pre">from</span> <span class="pre">...</span> <span class="pre">import</span></code> fails to find a name that is to be imported.</p> </dd></dl> <dl class="exception"> <dt id="exceptions.IndexError"> <em class="property">exception </em><code class="descname">IndexError</code><a class="headerlink" href="#exceptions.IndexError" title="Permalink to this definition">¶</a></dt> <dd><p>Raised when a sequence subscript is out of range. (Slice indices are silently truncated to fall in the allowed range; if an index is not a plain integer, <a class="reference internal" href="#exceptions.TypeError" title="exceptions.TypeError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">TypeError</span></code></a> is raised.)</p> </dd></dl> <dl class="exception"> <dt id="exceptions.KeyError"> <em class="property">exception </em><code class="descname">KeyError</code><a class="headerlink" href="#exceptions.KeyError" title="Permalink to this definition">¶</a></dt> <dd><p>Raised when a mapping (dictionary) key is not found in the set of existing keys.</p> </dd></dl> <dl class="exception"> <dt id="exceptions.KeyboardInterrupt"> <em class="property">exception </em><code class="descname">KeyboardInterrupt</code><a class="headerlink" href="#exceptions.KeyboardInterrupt" title="Permalink to this definition">¶</a></dt> <dd><p>Raised when the user hits the interrupt key (normally <kbd class="kbd docutils literal notranslate">Control-C</kbd> or <kbd class="kbd docutils literal notranslate">Delete</kbd>). During execution, a check for interrupts is made regularly. Interrupts typed when a built-in function <a class="reference internal" href="functions.html#input" title="input"><code class="xref py py-func docutils literal notranslate"><span class="pre">input()</span></code></a> or <a class="reference internal" href="functions.html#raw_input" title="raw_input"><code class="xref py py-func docutils literal notranslate"><span class="pre">raw_input()</span></code></a> is waiting for input also raise this exception. The exception inherits from <a class="reference internal" href="#exceptions.BaseException" title="exceptions.BaseException"><code class="xref py py-exc docutils literal notranslate"><span class="pre">BaseException</span></code></a> so as to not be accidentally caught by code that catches <a class="reference internal" href="#exceptions.Exception" title="exceptions.Exception"><code class="xref py py-exc docutils literal notranslate"><span class="pre">Exception</span></code></a> and thus prevent the interpreter from exiting.</p> <div class="versionchanged"> <p><span class="versionmodified">Changed in version 2.5: </span>Changed to inherit from <a class="reference internal" href="#exceptions.BaseException" title="exceptions.BaseException"><code class="xref py py-exc docutils literal notranslate"><span class="pre">BaseException</span></code></a>.</p> </div> </dd></dl> <dl class="exception"> <dt id="exceptions.MemoryError"> <em class="property">exception </em><code class="descname">MemoryError</code><a class="headerlink" href="#exceptions.MemoryError" title="Permalink to this definition">¶</a></dt> <dd><p>Raised when an operation runs out of memory but the situation may still be rescued (by deleting some objects). The associated value is a string indicating what kind of (internal) operation ran out of memory. Note that because of the underlying memory management architecture (C’s <code class="xref c c-func docutils literal notranslate"><span class="pre">malloc()</span></code> function), the interpreter may not always be able to completely recover from this situation; it nevertheless raises an exception so that a stack traceback can be printed, in case a run-away program was the cause.</p> </dd></dl> <dl class="exception"> <dt id="exceptions.NameError"> <em class="property">exception </em><code class="descname">NameError</code><a class="headerlink" href="#exceptions.NameError" title="Permalink to this definition">¶</a></dt> <dd><p>Raised when a local or global name is not found. This applies only to unqualified names. The associated value is an error message that includes the name that could not be found.</p> </dd></dl> <dl class="exception"> <dt id="exceptions.NotImplementedError"> <em class="property">exception </em><code class="descname">NotImplementedError</code><a class="headerlink" href="#exceptions.NotImplementedError" title="Permalink to this definition">¶</a></dt> <dd><p>This exception is derived from <a class="reference internal" href="#exceptions.RuntimeError" title="exceptions.RuntimeError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">RuntimeError</span></code></a>. In user defined base classes, abstract methods should raise this exception when they require derived classes to override the method.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 1.5.2.</span></p> </div> </dd></dl> <dl class="exception"> <dt id="exceptions.OSError"> <em class="property">exception </em><code class="descname">OSError</code><a class="headerlink" href="#exceptions.OSError" title="Permalink to this definition">¶</a></dt> <dd><p id="index-3">This exception is derived from <a class="reference internal" href="#exceptions.EnvironmentError" title="exceptions.EnvironmentError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">EnvironmentError</span></code></a>. It is raised when a function returns a system-related error (not for illegal argument types or other incidental errors). The <a class="reference internal" href="errno.html#module-errno" title="errno: Standard errno system symbols."><code class="xref py py-attr docutils literal notranslate"><span class="pre">errno</span></code></a> attribute is a numeric error code from <code class="xref c c-data docutils literal notranslate"><span class="pre">errno</span></code>, and the <code class="xref py py-attr docutils literal notranslate"><span class="pre">strerror</span></code> attribute is the corresponding string, as would be printed by the C function <code class="xref c c-func docutils literal notranslate"><span class="pre">perror()</span></code>. See the module <a class="reference internal" href="errno.html#module-errno" title="errno: Standard errno system symbols."><code class="xref py py-mod docutils literal notranslate"><span class="pre">errno</span></code></a>, which contains names for the error codes defined by the underlying operating system.</p> <p>For exceptions that involve a file system path (such as <code class="xref py py-func docutils literal notranslate"><span class="pre">chdir()</span></code> or <code class="xref py py-func docutils literal notranslate"><span class="pre">unlink()</span></code>), the exception instance will contain a third attribute, <code class="xref py py-attr docutils literal notranslate"><span class="pre">filename</span></code>, which is the file name passed to the function.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 1.5.2.</span></p> </div> </dd></dl> <dl class="exception"> <dt id="exceptions.OverflowError"> <em class="property">exception </em><code class="descname">OverflowError</code><a class="headerlink" href="#exceptions.OverflowError" title="Permalink to this definition">¶</a></dt> <dd><p>Raised when the result of an arithmetic operation is too large to be represented. This cannot occur for long integers (which would rather raise <a class="reference internal" href="#exceptions.MemoryError" title="exceptions.MemoryError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">MemoryError</span></code></a> than give up) and for most operations with plain integers, which return a long integer instead. Because of the lack of standardization of floating point exception handling in C, most floating point operations also aren’t checked.</p> </dd></dl> <dl class="exception"> <dt id="exceptions.ReferenceError"> <em class="property">exception </em><code class="descname">ReferenceError</code><a class="headerlink" href="#exceptions.ReferenceError" title="Permalink to this definition">¶</a></dt> <dd><p>This exception is raised when a weak reference proxy, created by the <a class="reference internal" href="weakref.html#weakref.proxy" title="weakref.proxy"><code class="xref py py-func docutils literal notranslate"><span class="pre">weakref.proxy()</span></code></a> function, is used to access an attribute of the referent after it has been garbage collected. For more information on weak references, see the <a class="reference internal" href="weakref.html#module-weakref" title="weakref: Support for weak references and weak dictionaries."><code class="xref py py-mod docutils literal notranslate"><span class="pre">weakref</span></code></a> module.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 2.2: </span>Previously known as the <a class="reference internal" href="weakref.html#weakref.ReferenceError" title="weakref.ReferenceError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">weakref.ReferenceError</span></code></a> exception.</p> </div> </dd></dl> <dl class="exception"> <dt id="exceptions.RuntimeError"> <em class="property">exception </em><code class="descname">RuntimeError</code><a class="headerlink" href="#exceptions.RuntimeError" title="Permalink to this definition">¶</a></dt> <dd><p>Raised when an error is detected that doesn’t fall in any of the other categories. The associated value is a string indicating what precisely went wrong.</p> </dd></dl> <dl class="exception"> <dt id="exceptions.StopIteration"> <em class="property">exception </em><code class="descname">StopIteration</code><a class="headerlink" href="#exceptions.StopIteration" title="Permalink to this definition">¶</a></dt> <dd><p>Raised by an <a class="reference internal" href="../glossary.html#term-iterator"><span class="xref std std-term">iterator</span></a>’s <a class="reference internal" href="stdtypes.html#iterator.next" title="iterator.next"><code class="xref py py-meth docutils literal notranslate"><span class="pre">next()</span></code></a> method to signal that there are no further values. This is derived from <a class="reference internal" href="#exceptions.Exception" title="exceptions.Exception"><code class="xref py py-exc docutils literal notranslate"><span class="pre">Exception</span></code></a> rather than <a class="reference internal" href="#exceptions.StandardError" title="exceptions.StandardError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">StandardError</span></code></a>, since this is not considered an error in its normal application.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 2.2.</span></p> </div> </dd></dl> <dl class="exception"> <dt id="exceptions.SyntaxError"> <em class="property">exception </em><code class="descname">SyntaxError</code><a class="headerlink" href="#exceptions.SyntaxError" title="Permalink to this definition">¶</a></dt> <dd><p>Raised when the parser encounters a syntax error. This may occur in an <a class="reference internal" href="../reference/simple_stmts.html#import"><code class="xref std std-keyword docutils literal notranslate"><span class="pre">import</span></code></a> statement, in an <a class="reference internal" href="../reference/simple_stmts.html#exec"><code class="xref std std-keyword docutils literal notranslate"><span class="pre">exec</span></code></a> statement, in a call to the built-in function <a class="reference internal" href="functions.html#eval" title="eval"><code class="xref py py-func docutils literal notranslate"><span class="pre">eval()</span></code></a> or <a class="reference internal" href="functions.html#input" title="input"><code class="xref py py-func docutils literal notranslate"><span class="pre">input()</span></code></a>, or when reading the initial script or standard input (also interactively).</p> <p>Instances of this class have attributes <code class="xref py py-attr docutils literal notranslate"><span class="pre">filename</span></code>, <code class="xref py py-attr docutils literal notranslate"><span class="pre">lineno</span></code>, <code class="xref py py-attr docutils literal notranslate"><span class="pre">offset</span></code> and <code class="xref py py-attr docutils literal notranslate"><span class="pre">text</span></code> for easier access to the details. <a class="reference internal" href="functions.html#str" title="str"><code class="xref py py-func docutils literal notranslate"><span class="pre">str()</span></code></a> of the exception instance returns only the message.</p> </dd></dl> <dl class="exception"> <dt id="exceptions.IndentationError"> <em class="property">exception </em><code class="descname">IndentationError</code><a class="headerlink" href="#exceptions.IndentationError" title="Permalink to this definition">¶</a></dt> <dd><p>Base class for syntax errors related to incorrect indentation. This is a subclass of <a class="reference internal" href="#exceptions.SyntaxError" title="exceptions.SyntaxError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">SyntaxError</span></code></a>.</p> </dd></dl> <dl class="exception"> <dt id="exceptions.TabError"> <em class="property">exception </em><code class="descname">TabError</code><a class="headerlink" href="#exceptions.TabError" title="Permalink to this definition">¶</a></dt> <dd><p>Raised when indentation contains an inconsistent use of tabs and spaces. This is a subclass of <a class="reference internal" href="#exceptions.IndentationError" title="exceptions.IndentationError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">IndentationError</span></code></a>.</p> </dd></dl> <dl class="exception"> <dt id="exceptions.SystemError"> <em class="property">exception </em><code class="descname">SystemError</code><a class="headerlink" href="#exceptions.SystemError" title="Permalink to this definition">¶</a></dt> <dd><p>Raised when the interpreter finds an internal error, but the situation does not look so serious to cause it to abandon all hope. The associated value is a string indicating what went wrong (in low-level terms).</p> <p>You should report this to the author or maintainer of your Python interpreter. Be sure to report the version of the Python interpreter (<code class="docutils literal notranslate"><span class="pre">sys.version</span></code>; it is also printed at the start of an interactive Python session), the exact error message (the exception’s associated value) and if possible the source of the program that triggered the error.</p> </dd></dl> <dl class="exception"> <dt id="exceptions.SystemExit"> <em class="property">exception </em><code class="descname">SystemExit</code><a class="headerlink" href="#exceptions.SystemExit" title="Permalink to this definition">¶</a></dt> <dd><p>This exception is raised by the <a class="reference internal" href="sys.html#sys.exit" title="sys.exit"><code class="xref py py-func docutils literal notranslate"><span class="pre">sys.exit()</span></code></a> function. When it is not handled, the Python interpreter exits; no stack traceback is printed. If the associated value is a plain integer, it specifies the system exit status (passed to C’s <code class="xref c c-func docutils literal notranslate"><span class="pre">exit()</span></code> function); if it is <code class="docutils literal notranslate"><span class="pre">None</span></code>, the exit status is zero; if it has another type (such as a string), the object’s value is printed and the exit status is one.</p> <p>Instances have an attribute <code class="xref py py-attr docutils literal notranslate"><span class="pre">code</span></code> which is set to the proposed exit status or error message (defaulting to <code class="docutils literal notranslate"><span class="pre">None</span></code>). Also, this exception derives directly from <a class="reference internal" href="#exceptions.BaseException" title="exceptions.BaseException"><code class="xref py py-exc docutils literal notranslate"><span class="pre">BaseException</span></code></a> and not <a class="reference internal" href="#exceptions.StandardError" title="exceptions.StandardError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">StandardError</span></code></a>, since it is not technically an error.</p> <p>A call to <a class="reference internal" href="sys.html#sys.exit" title="sys.exit"><code class="xref py py-func docutils literal notranslate"><span class="pre">sys.exit()</span></code></a> is translated into an exception so that clean-up handlers (<a class="reference internal" href="../reference/compound_stmts.html#finally"><code class="xref std std-keyword docutils literal notranslate"><span class="pre">finally</span></code></a> clauses of <a class="reference internal" href="../reference/compound_stmts.html#try"><code class="xref std std-keyword docutils literal notranslate"><span class="pre">try</span></code></a> statements) can be executed, and so that a debugger can execute a script without running the risk of losing control. The <a class="reference internal" href="os.html#os._exit" title="os._exit"><code class="xref py py-func docutils literal notranslate"><span class="pre">os._exit()</span></code></a> function can be used if it is absolutely positively necessary to exit immediately (for example, in the child process after a call to <a class="reference internal" href="os.html#os.fork" title="os.fork"><code class="xref py py-func docutils literal notranslate"><span class="pre">os.fork()</span></code></a>).</p> <p>The exception inherits from <a class="reference internal" href="#exceptions.BaseException" title="exceptions.BaseException"><code class="xref py py-exc docutils literal notranslate"><span class="pre">BaseException</span></code></a> instead of <a class="reference internal" href="#exceptions.StandardError" title="exceptions.StandardError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">StandardError</span></code></a> or <a class="reference internal" href="#exceptions.Exception" title="exceptions.Exception"><code class="xref py py-exc docutils literal notranslate"><span class="pre">Exception</span></code></a> so that it is not accidentally caught by code that catches <a class="reference internal" href="#exceptions.Exception" title="exceptions.Exception"><code class="xref py py-exc docutils literal notranslate"><span class="pre">Exception</span></code></a>. This allows the exception to properly propagate up and cause the interpreter to exit.</p> <div class="versionchanged"> <p><span class="versionmodified">Changed in version 2.5: </span>Changed to inherit from <a class="reference internal" href="#exceptions.BaseException" title="exceptions.BaseException"><code class="xref py py-exc docutils literal notranslate"><span class="pre">BaseException</span></code></a>.</p> </div> </dd></dl> <dl class="exception"> <dt id="exceptions.TypeError"> <em class="property">exception </em><code class="descname">TypeError</code><a class="headerlink" href="#exceptions.TypeError" title="Permalink to this definition">¶</a></dt> <dd><p>Raised when an operation or function is applied to an object of inappropriate type. The associated value is a string giving details about the type mismatch.</p> </dd></dl> <dl class="exception"> <dt id="exceptions.UnboundLocalError"> <em class="property">exception </em><code class="descname">UnboundLocalError</code><a class="headerlink" href="#exceptions.UnboundLocalError" title="Permalink to this definition">¶</a></dt> <dd><p>Raised when a reference is made to a local variable in a function or method, but no value has been bound to that variable. This is a subclass of <a class="reference internal" href="#exceptions.NameError" title="exceptions.NameError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">NameError</span></code></a>.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 2.0.</span></p> </div> </dd></dl> <dl class="exception"> <dt id="exceptions.UnicodeError"> <em class="property">exception </em><code class="descname">UnicodeError</code><a class="headerlink" href="#exceptions.UnicodeError" title="Permalink to this definition">¶</a></dt> <dd><p>Raised when a Unicode-related encoding or decoding error occurs. It is a subclass of <a class="reference internal" href="#exceptions.ValueError" title="exceptions.ValueError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">ValueError</span></code></a>.</p> <p><a class="reference internal" href="#exceptions.UnicodeError" title="exceptions.UnicodeError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">UnicodeError</span></code></a> has attributes that describe the encoding or decoding error. For example, <code class="docutils literal notranslate"><span class="pre">err.object[err.start:err.end]</span></code> gives the particular invalid input that the codec failed on.</p> <dl class="attribute"> <dt id="exceptions.UnicodeError.encoding"> <code class="descname">encoding</code><a class="headerlink" href="#exceptions.UnicodeError.encoding" title="Permalink to this definition">¶</a></dt> <dd><p>The name of the encoding that raised the error.</p> </dd></dl> <dl class="attribute"> <dt id="exceptions.UnicodeError.reason"> <code class="descname">reason</code><a class="headerlink" href="#exceptions.UnicodeError.reason" title="Permalink to this definition">¶</a></dt> <dd><p>A string describing the specific codec error.</p> </dd></dl> <dl class="attribute"> <dt id="exceptions.UnicodeError.object"> <code class="descname">object</code><a class="headerlink" href="#exceptions.UnicodeError.object" title="Permalink to this definition">¶</a></dt> <dd><p>The object the codec was attempting to encode or decode.</p> </dd></dl> <dl class="attribute"> <dt id="exceptions.UnicodeError.start"> <code class="descname">start</code><a class="headerlink" href="#exceptions.UnicodeError.start" title="Permalink to this definition">¶</a></dt> <dd><p>The first index of invalid data in <a class="reference internal" href="functions.html#object" title="object"><code class="xref py py-attr docutils literal notranslate"><span class="pre">object</span></code></a>.</p> </dd></dl> <dl class="attribute"> <dt id="exceptions.UnicodeError.end"> <code class="descname">end</code><a class="headerlink" href="#exceptions.UnicodeError.end" title="Permalink to this definition">¶</a></dt> <dd><p>The index after the last invalid data in <a class="reference internal" href="functions.html#object" title="object"><code class="xref py py-attr docutils literal notranslate"><span class="pre">object</span></code></a>.</p> </dd></dl> <div class="versionadded"> <p><span class="versionmodified">New in version 2.0.</span></p> </div> </dd></dl> <dl class="exception"> <dt id="exceptions.UnicodeEncodeError"> <em class="property">exception </em><code class="descname">UnicodeEncodeError</code><a class="headerlink" href="#exceptions.UnicodeEncodeError" title="Permalink to this definition">¶</a></dt> <dd><p>Raised when a Unicode-related error occurs during encoding. It is a subclass of <a class="reference internal" href="#exceptions.UnicodeError" title="exceptions.UnicodeError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">UnicodeError</span></code></a>.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 2.3.</span></p> </div> </dd></dl> <dl class="exception"> <dt id="exceptions.UnicodeDecodeError"> <em class="property">exception </em><code class="descname">UnicodeDecodeError</code><a class="headerlink" href="#exceptions.UnicodeDecodeError" title="Permalink to this definition">¶</a></dt> <dd><p>Raised when a Unicode-related error occurs during decoding. It is a subclass of <a class="reference internal" href="#exceptions.UnicodeError" title="exceptions.UnicodeError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">UnicodeError</span></code></a>.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 2.3.</span></p> </div> </dd></dl> <dl class="exception"> <dt id="exceptions.UnicodeTranslateError"> <em class="property">exception </em><code class="descname">UnicodeTranslateError</code><a class="headerlink" href="#exceptions.UnicodeTranslateError" title="Permalink to this definition">¶</a></dt> <dd><p>Raised when a Unicode-related error occurs during translating. It is a subclass of <a class="reference internal" href="#exceptions.UnicodeError" title="exceptions.UnicodeError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">UnicodeError</span></code></a>.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 2.3.</span></p> </div> </dd></dl> <dl class="exception"> <dt id="exceptions.ValueError"> <em class="property">exception </em><code class="descname">ValueError</code><a class="headerlink" href="#exceptions.ValueError" title="Permalink to this definition">¶</a></dt> <dd><p>Raised when an operation or function receives an argument that has the right type but an inappropriate value, and the situation is not described by a more precise exception such as <a class="reference internal" href="#exceptions.IndexError" title="exceptions.IndexError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">IndexError</span></code></a>.</p> </dd></dl> <dl class="exception"> <dt id="exceptions.VMSError"> <em class="property">exception </em><code class="descname">VMSError</code><a class="headerlink" href="#exceptions.VMSError" title="Permalink to this definition">¶</a></dt> <dd><p>Only available on VMS. Raised when a VMS-specific error occurs.</p> </dd></dl> <dl class="exception"> <dt id="exceptions.WindowsError"> <em class="property">exception </em><code class="descname">WindowsError</code><a class="headerlink" href="#exceptions.WindowsError" title="Permalink to this definition">¶</a></dt> <dd><p>Raised when a Windows-specific error occurs or when the error number does not correspond to an <code class="xref c c-data docutils literal notranslate"><span class="pre">errno</span></code> value. The <code class="xref py py-attr docutils literal notranslate"><span class="pre">winerror</span></code> and <code class="xref py py-attr docutils literal notranslate"><span class="pre">strerror</span></code> values are created from the return values of the <code class="xref c c-func docutils literal notranslate"><span class="pre">GetLastError()</span></code> and <code class="xref c c-func docutils literal notranslate"><span class="pre">FormatMessage()</span></code> functions from the Windows Platform API. The <a class="reference internal" href="errno.html#module-errno" title="errno: Standard errno system symbols."><code class="xref py py-attr docutils literal notranslate"><span class="pre">errno</span></code></a> value maps the <code class="xref py py-attr docutils literal notranslate"><span class="pre">winerror</span></code> value to corresponding <code class="docutils literal notranslate"><span class="pre">errno.h</span></code> values. This is a subclass of <a class="reference internal" href="#exceptions.OSError" title="exceptions.OSError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">OSError</span></code></a>.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 2.0.</span></p> </div> <div class="versionchanged"> <p><span class="versionmodified">Changed in version 2.5: </span>Previous versions put the <code class="xref c c-func docutils literal notranslate"><span class="pre">GetLastError()</span></code> codes into <a class="reference internal" href="errno.html#module-errno" title="errno: Standard errno system symbols."><code class="xref py py-attr docutils literal notranslate"><span class="pre">errno</span></code></a>.</p> </div> </dd></dl> <dl class="exception"> <dt id="exceptions.ZeroDivisionError"> <em class="property">exception </em><code class="descname">ZeroDivisionError</code><a class="headerlink" href="#exceptions.ZeroDivisionError" title="Permalink to this definition">¶</a></dt> <dd><p>Raised when the second argument of a division or modulo operation is zero. The associated value is a string indicating the type of the operands and the operation.</p> </dd></dl> <p>The following exceptions are used as warning categories; see the <a class="reference internal" href="warnings.html#module-warnings" title="warnings: Issue warning messages and control their disposition."><code class="xref py py-mod docutils literal notranslate"><span class="pre">warnings</span></code></a> module for more information.</p> <dl class="exception"> <dt id="exceptions.Warning"> <em class="property">exception </em><code class="descname">Warning</code><a class="headerlink" href="#exceptions.Warning" title="Permalink to this definition">¶</a></dt> <dd><p>Base class for warning categories.</p> </dd></dl> <dl class="exception"> <dt id="exceptions.UserWarning"> <em class="property">exception </em><code class="descname">UserWarning</code><a class="headerlink" href="#exceptions.UserWarning" title="Permalink to this definition">¶</a></dt> <dd><p>Base class for warnings generated by user code.</p> </dd></dl> <dl class="exception"> <dt id="exceptions.DeprecationWarning"> <em class="property">exception </em><code class="descname">DeprecationWarning</code><a class="headerlink" href="#exceptions.DeprecationWarning" title="Permalink to this definition">¶</a></dt> <dd><p>Base class for warnings about deprecated features.</p> </dd></dl> <dl class="exception"> <dt id="exceptions.PendingDeprecationWarning"> <em class="property">exception </em><code class="descname">PendingDeprecationWarning</code><a class="headerlink" href="#exceptions.PendingDeprecationWarning" title="Permalink to this definition">¶</a></dt> <dd><p>Base class for warnings about features which will be deprecated in the future.</p> </dd></dl> <dl class="exception"> <dt id="exceptions.SyntaxWarning"> <em class="property">exception </em><code class="descname">SyntaxWarning</code><a class="headerlink" href="#exceptions.SyntaxWarning" title="Permalink to this definition">¶</a></dt> <dd><p>Base class for warnings about dubious syntax.</p> </dd></dl> <dl class="exception"> <dt id="exceptions.RuntimeWarning"> <em class="property">exception </em><code class="descname">RuntimeWarning</code><a class="headerlink" href="#exceptions.RuntimeWarning" title="Permalink to this definition">¶</a></dt> <dd><p>Base class for warnings about dubious runtime behavior.</p> </dd></dl> <dl class="exception"> <dt id="exceptions.FutureWarning"> <em class="property">exception </em><code class="descname">FutureWarning</code><a class="headerlink" href="#exceptions.FutureWarning" title="Permalink to this definition">¶</a></dt> <dd><p>Base class for warnings about constructs that will change semantically in the future.</p> </dd></dl> <dl class="exception"> <dt id="exceptions.ImportWarning"> <em class="property">exception </em><code class="descname">ImportWarning</code><a class="headerlink" href="#exceptions.ImportWarning" title="Permalink to this definition">¶</a></dt> <dd><p>Base class for warnings about probable mistakes in module imports.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 2.5.</span></p> </div> </dd></dl> <dl class="exception"> <dt id="exceptions.UnicodeWarning"> <em class="property">exception </em><code class="descname">UnicodeWarning</code><a class="headerlink" href="#exceptions.UnicodeWarning" title="Permalink to this definition">¶</a></dt> <dd><p>Base class for warnings related to Unicode.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 2.5.</span></p> </div> </dd></dl> <div class="section" id="exception-hierarchy"> <h2>6.1. Exception hierarchy<a class="headerlink" href="#exception-hierarchy" title="Permalink to this headline">¶</a></h2> <p>The class hierarchy for built-in exceptions is:</p> <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="ne">BaseException</span> <span class="o">+--</span> <span class="ne">SystemExit</span> <span class="o">+--</span> <span class="ne">KeyboardInterrupt</span> <span class="o">+--</span> <span class="ne">GeneratorExit</span> <span class="o">+--</span> <span class="ne">Exception</span> <span class="o">+--</span> <span class="ne">StopIteration</span> <span class="o">+--</span> <span class="n">StandardError</span> <span class="o">|</span> <span class="o">+--</span> <span class="ne">BufferError</span> <span class="o">|</span> <span class="o">+--</span> <span class="ne">ArithmeticError</span> <span class="o">|</span> <span class="o">|</span> <span class="o">+--</span> <span class="ne">FloatingPointError</span> <span class="o">|</span> <span class="o">|</span> <span class="o">+--</span> <span class="ne">OverflowError</span> <span class="o">|</span> <span class="o">|</span> <span class="o">+--</span> <span class="ne">ZeroDivisionError</span> <span class="o">|</span> <span class="o">+--</span> <span class="ne">AssertionError</span> <span class="o">|</span> <span class="o">+--</span> <span class="ne">AttributeError</span> <span class="o">|</span> <span class="o">+--</span> <span class="ne">EnvironmentError</span> <span class="o">|</span> <span class="o">|</span> <span class="o">+--</span> <span class="ne">IOError</span> <span class="o">|</span> <span class="o">|</span> <span class="o">+--</span> <span class="ne">OSError</span> <span class="o">|</span> <span class="o">|</span> <span class="o">+--</span> <span class="ne">WindowsError</span> <span class="p">(</span><span class="n">Windows</span><span class="p">)</span> <span class="o">|</span> <span class="o">|</span> <span class="o">+--</span> <span class="ne">VMSError</span> <span class="p">(</span><span class="n">VMS</span><span class="p">)</span> <span class="o">|</span> <span class="o">+--</span> <span class="ne">EOFError</span> <span class="o">|</span> <span class="o">+--</span> <span class="ne">ImportError</span> <span class="o">|</span> <span class="o">+--</span> <span class="ne">LookupError</span> <span class="o">|</span> <span class="o">|</span> <span class="o">+--</span> <span class="ne">IndexError</span> <span class="o">|</span> <span class="o">|</span> <span class="o">+--</span> <span class="ne">KeyError</span> <span class="o">|</span> <span class="o">+--</span> <span class="ne">MemoryError</span> <span class="o">|</span> <span class="o">+--</span> <span class="ne">NameError</span> <span class="o">|</span> <span class="o">|</span> <span class="o">+--</span> <span class="ne">UnboundLocalError</span> <span class="o">|</span> <span class="o">+--</span> <span class="ne">ReferenceError</span> <span class="o">|</span> <span class="o">+--</span> <span class="ne">RuntimeError</span> <span class="o">|</span> <span class="o">|</span> <span class="o">+--</span> <span class="ne">NotImplementedError</span> <span class="o">|</span> <span class="o">+--</span> <span class="ne">SyntaxError</span> <span class="o">|</span> <span class="o">|</span> <span class="o">+--</span> <span class="ne">IndentationError</span> <span class="o">|</span> <span class="o">|</span> <span class="o">+--</span> <span class="ne">TabError</span> <span class="o">|</span> <span class="o">+--</span> <span class="ne">SystemError</span> <span class="o">|</span> <span class="o">+--</span> <span class="ne">TypeError</span> <span class="o">|</span> <span class="o">+--</span> <span class="ne">ValueError</span> <span class="o">|</span> <span class="o">+--</span> <span class="ne">UnicodeError</span> <span class="o">|</span> <span class="o">+--</span> <span class="ne">UnicodeDecodeError</span> <span class="o">|</span> <span class="o">+--</span> <span class="ne">UnicodeEncodeError</span> <span class="o">|</span> <span class="o">+--</span> <span class="ne">UnicodeTranslateError</span> <span class="o">+--</span> <span class="ne">Warning</span> <span class="o">+--</span> <span class="ne">DeprecationWarning</span> <span class="o">+--</span> <span class="ne">PendingDeprecationWarning</span> <span class="o">+--</span> <span class="ne">RuntimeWarning</span> <span class="o">+--</span> <span class="ne">SyntaxWarning</span> <span class="o">+--</span> <span class="ne">UserWarning</span> <span class="o">+--</span> <span class="ne">FutureWarning</span> <span class="o">+--</span> <span class="ne">ImportWarning</span> <span class="o">+--</span> <span class="ne">UnicodeWarning</span> <span class="o">+--</span> <span class="ne">BytesWarning</span> </pre></div> </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="#">6. Built-in Exceptions</a><ul> <li><a class="reference internal" href="#exception-hierarchy">6.1. Exception hierarchy</a></li> </ul> </li> </ul> <h4>Previous topic</h4> <p class="topless"><a href="stdtypes.html" title="previous chapter">5. Built-in Types</a></p> <h4>Next topic</h4> <p class="topless"><a href="strings.html" title="next chapter">7. 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