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2to3.html
63.71
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__builtin__.html
11.79
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__future__.html
15.58
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__main__.html
8.33
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_winreg.html
73.99
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abc.html
26.82
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aepack.html
15.47
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aetools.html
18.79
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aetypes.html
27.08
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aifc.html
29.59
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al.html
22.13
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allos.html
35.48
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anydbm.html
19.31
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archiving.html
10.64
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argparse.html
269.59
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array.html
35.35
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ast.html
42.42
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asynchat.html
35.84
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asyncore.html
43.22
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atexit.html
19.23
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audioop.html
41.32
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autogil.html
9.77
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base64.html
24.8
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basehttpserver.html
40.6
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bastion.html
13.02
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bdb.html
50.06
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binascii.html
26.64
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binhex.html
12.66
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bisect.html
28.52
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bsddb.html
32.02
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bz2.html
31.92
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calendar.html
50.16
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carbon.html
54.14
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cd.html
35.24
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cgi.html
58.4
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cgihttpserver.html
15.12
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cgitb.html
13.5
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chunk.html
17.41
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cmath.html
32.41
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cmd.html
32.69
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code.html
28.92
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codecs.html
125.92
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codeop.html
16.42
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collections.html
150.36
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colorpicker.html
9.02
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colorsys.html
14.38
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commands.html
16.63
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compileall.html
21.18
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compiler.html
78.14
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configparser.html
73.92
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constants.html
14.68
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contextlib.html
22.91
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cookie.html
45.38
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cookielib.html
102.78
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copy.html
14.21
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copy_reg.html
15.82
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crypt.html
11.62
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crypto.html
8.35
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csv.html
82.79
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ctypes.html
280.57
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curses.ascii.html
28.97
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curses.html
200.94
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curses.panel.html
18.43
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custominterp.html
8.59
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datatypes.html
18.84
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datetime.html
261.02
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dbhash.html
18.4
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dbm.html
14.75
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debug.html
11.28
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decimal.html
239.14
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development.html
15.27
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difflib.html
96.93
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dircache.html
13.66
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dis.html
96.52
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distribution.html
8.27
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distutils.html
10.97
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dl.html
19.27
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doctest.html
193.18
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docxmlrpcserver.html
20.02
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dumbdbm.html
16.74
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dummy_thread.html
11.04
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dummy_threading.html
9.96
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easydialogs.html
38.83
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email-examples.html
47.2
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email.charset.html
32.45
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email.encoders.html
14.09
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email.errors.html
19.2
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email.generator.html
24.78
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email.header.html
31.12
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email.html
55.3
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email.iterators.html
14.22
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email.message.html
74.91
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email.mime.html
34.51
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email.parser.html
37.09
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email.utils.html
30.04
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ensurepip.html
20.21
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errno.html
52.31
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exceptions.html
73.4
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fcntl.html
27.85
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filecmp.html
26.49
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fileformats.html
10.21
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fileinput.html
29.36
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filesys.html
11.55
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fl.html
71.58
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fm.html
15
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fnmatch.html
17.78
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formatter.html
43.91
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fpectl.html
17.84
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fpformat.html
12.65
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fractions.html
27.17
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framework.html
44.24
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frameworks.html
8.11
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ftplib.html
56.56
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functions.html
216.84
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functools.html
31.06
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future_builtins.html
15.9
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gc.html
30.74
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gdbm.html
19.35
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gensuitemodule.html
14.54
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getopt.html
26.56
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getpass.html
12.5
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gettext.html
91.32
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gl.html
26.71
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glob.html
15.42
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grp.html
12.33
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gzip.html
21.95
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hashlib.html
27.4
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heapq.html
36.72
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hmac.html
15.97
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hotshot.html
22.69
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htmllib.html
29.9
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htmlparser.html
45.11
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httplib.html
78.55
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i18n.html
10.61
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ic.html
22.03
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idle.html
45.74
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imageop.html
20.94
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imaplib.html
69.9
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imgfile.html
14.91
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imghdr.html
13.43
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imp.html
41.48
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importlib.html
10.27
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imputil.html
36.11
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index.html
82.54
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inspect.html
64.31
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internet.html
26.77
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intro.html
9.76
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io.html
122.3
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ipc.html
17.18
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itertools.html
129.91
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jpeg.html
15.36
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json.html
79.09
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keyword.html
9.27
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language.html
12.35
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linecache.html
12.7
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locale.html
68.54
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logging.config.html
82.23
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logging.handlers.html
91.96
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logging.html
123.15
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mac.html
24.49
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macos.html
18.51
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macosa.html
14.55
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macostools.html
19.67
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macpath.html
9.19
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mailbox.html
185.53
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mailcap.html
15.3
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markup.html
20.37
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marshal.html
19.88
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math.html
50.52
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md5.html
16.65
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mhlib.html
30.04
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mimetools.html
23.84
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mimetypes.html
35.82
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mimewriter.html
18.19
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mimify.html
16.96
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miniaeframe.html
14.5
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misc.html
7.77
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mm.html
10.19
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mmap.html
33.52
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modulefinder.html
19.85
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modules.html
9.68
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msilib.html
72.78
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msvcrt.html
24.1
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multifile.html
28.82
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multiprocessing.html
423.97
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mutex.html
13.56
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netdata.html
19.28
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netrc.html
15.51
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new.html
16.1
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nis.html
13.19
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nntplib.html
51.08
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numbers.html
40.91
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numeric.html
14.85
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operator.html
118.32
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optparse.html
251.08
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os.html
270.49
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os.path.html
48.87
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ossaudiodev.html
49.79
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othergui.html
9.98
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parser.html
44.52
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pdb.html
41.44
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persistence.html
16.25
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pickle.html
107.94
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pickletools.html
13.21
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pipes.html
21.85
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pkgutil.html
30.59
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platform.html
40.14
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plistlib.html
20.96
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popen2.html
30.13
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poplib.html
27.93
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posix.html
17.27
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posixfile.html
23.68
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pprint.html
36.42
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profile.html
76.65
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pty.html
11.42
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pwd.html
13.53
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py_compile.html
13.33
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pyclbr.html
18.14
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pydoc.html
14.33
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pyexpat.html
93.28
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python.html
13.53
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queue.html
29.64
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quopri.html
14.5
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random.html
47.78
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re.html
163.11
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readline.html
41.2
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repr.html
24.57
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resource.html
30.86
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restricted.html
12.69
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rexec.html
43.59
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rfc822.html
51.25
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rlcompleter.html
15.29
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robotparser.html
15.01
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runpy.html
23.55
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sched.html
21.76
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scrolledtext.html
10.67
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select.html
50.17
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sets.html
39.92
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sgi.html
11.09
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sgmllib.html
38.77
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sha.html
14.55
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shelve.html
32.93
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shlex.html
38.43
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shutil.html
49.49
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signal.html
36.52
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simplehttpserver.html
21.57
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simplexmlrpcserver.html
40.41
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site.html
29
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smtpd.html
15.64
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smtplib.html
51.86
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sndhdr.html
12.05
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socket.html
126.94
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socketserver.html
81.38
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someos.html
17.09
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spwd.html
12.25
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sqlite3.html
154.12
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ssl.html
214.5
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stat.html
41.11
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statvfs.html
13.24
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stdtypes.html
309.83
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string.html
129.58
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stringio.html
21.1
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stringprep.html
21.4
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strings.html
16.42
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struct.html
47.68
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subprocess.html
117
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sun.html
7.83
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sunau.html
35.43
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sunaudio.html
21.05
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symbol.html
9.06
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symtable.html
29.03
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sys.html
118.12
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sysconfig.html
28.8
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syslog.html
21.29
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tabnanny.html
12.78
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tarfile.html
99.54
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telnetlib.html
30.46
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tempfile.html
35.02
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termios.html
19.22
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test.html
61.42
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textwrap.html
32.28
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thread.html
22.67
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threading.html
92.04
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time.html
65.55
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timeit.html
44.38
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tix.html
56.73
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tk.html
26.76
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tkinter.html
86.67
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token.html
27.31
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tokenize.html
21.69
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trace.html
33.91
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traceback.html
44.22
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ttk.html
123.83
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tty.html
10.95
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turtle.html
246.17
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types.html
33.66
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undoc.html
25.54
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unicodedata.html
22.64
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unittest.html
246.75
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unix.html
11.9
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urllib.html
71.61
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urllib2.html
128.77
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urlparse.html
49.04
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user.html
13.41
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userdict.html
32.96
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uu.html
13.25
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uuid.html
33.55
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warnings.html
51.86
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wave.html
29.08
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weakref.html
41.14
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webbrowser.html
29.53
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whichdb.html
10.44
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windows.html
10.37
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winsound.html
22.56
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wsgiref.html
94.38
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xdrlib.html
38.05
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xml.dom.html
110.39
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xml.dom.minidom.html
45.23
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xml.dom.pulldom.html
16.32
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xml.etree.elementtree.html
124.2
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xml.html
18.76
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xml.sax.handler.html
47.5
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xml.sax.html
26.04
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xml.sax.reader.html
51.4
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xml.sax.utils.html
18.11
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xmlrpclib.html
71.79
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zipfile.html
67.26
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zipimport.html
24.32
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zlib.html
34.41
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${this.title}
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<!DOCTYPE html> <html> <head> <meta charset="utf-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" /> <title>19.12. xml.sax.handler — Base classes for SAX handlers — Python 2.7.18 documentation</title> <link rel="stylesheet" type="text/css" href="../_static/pygments.css" /> <link rel="stylesheet" type="text/css" href="../_static/classic.css" /> <script data-url_root="../" id="documentation_options" src="../_static/documentation_options.js"></script> <script src="../_static/jquery.js"></script> <script src="../_static/underscore.js"></script> <script src="../_static/doctools.js"></script> <script src="../_static/sidebar.js"></script> <link rel="search" type="application/opensearchdescription+xml" title="Search within Python 2.7.18 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="19.13. xml.sax.saxutils — SAX Utilities" href="xml.sax.utils.html" /> <link rel="prev" title="19.11. xml.sax — Support for SAX2 parsers" href="xml.sax.html" /> <link rel="shortcut icon" type="image/png" href="../_static/py.png" /> <link rel="canonical" href="file:///usr/share/doc/python2.7/html/library/xml.sax.handler.html" /> <script type="text/javascript" src="../_static/copybutton.js"></script> </head><body> <div id="outdated-warning" style="padding: .5em; text-align: center; background-color: #FFBABA; color: #6A0E0E;"> This document is for an old version of Python that is <a href="https://devguide.python.org/devcycle/#end-of-life-branches">no longer supported</a>. 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Applications normally only need to implement those interfaces whose events they are interested in; they can implement the interfaces in a single object or in multiple objects. Handler implementations should inherit from the base classes provided in the module <a class="reference internal" href="#module-xml.sax.handler" title="xml.sax.handler: Base classes for SAX event handlers."><code class="xref py py-mod docutils literal notranslate"><span class="pre">xml.sax.handler</span></code></a>, so that all methods get default implementations.</p> <dl class="py class"> <dt class="sig sig-object py" id="xml.sax.handler.ContentHandler"> <em class="property"><span class="pre">class</span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">xml.sax.handler.</span></span><span class="sig-name descname"><span class="pre">ContentHandler</span></span><a class="headerlink" href="#xml.sax.handler.ContentHandler" title="Permalink to this definition">¶</a></dt> <dd><p>This is the main callback interface in SAX, and the one most important to applications. The order of events in this interface mirrors the order of the information in the document.</p> </dd></dl> <dl class="py class"> <dt class="sig sig-object py" id="xml.sax.handler.DTDHandler"> <em class="property"><span class="pre">class</span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">xml.sax.handler.</span></span><span class="sig-name descname"><span class="pre">DTDHandler</span></span><a class="headerlink" href="#xml.sax.handler.DTDHandler" title="Permalink to this definition">¶</a></dt> <dd><p>Handle DTD events.</p> <p>This interface specifies only those DTD events required for basic parsing (unparsed entities and attributes).</p> </dd></dl> <dl class="py class"> <dt class="sig sig-object py" id="xml.sax.handler.EntityResolver"> <em class="property"><span class="pre">class</span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">xml.sax.handler.</span></span><span class="sig-name descname"><span class="pre">EntityResolver</span></span><a class="headerlink" href="#xml.sax.handler.EntityResolver" title="Permalink to this definition">¶</a></dt> <dd><p>Basic interface for resolving entities. If you create an object implementing this interface, then register the object with your Parser, the parser will call the method in your object to resolve all external entities.</p> </dd></dl> <dl class="py class"> <dt class="sig sig-object py" id="xml.sax.handler.ErrorHandler"> <em class="property"><span class="pre">class</span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">xml.sax.handler.</span></span><span class="sig-name descname"><span class="pre">ErrorHandler</span></span><a class="headerlink" href="#xml.sax.handler.ErrorHandler" title="Permalink to this definition">¶</a></dt> <dd><p>Interface used by the parser to present error and warning messages to the application. The methods of this object control whether errors are immediately converted to exceptions or are handled in some other way.</p> </dd></dl> <p>In addition to these classes, <a class="reference internal" href="#module-xml.sax.handler" title="xml.sax.handler: Base classes for SAX event handlers."><code class="xref py py-mod docutils literal notranslate"><span class="pre">xml.sax.handler</span></code></a> provides symbolic constants for the feature and property names.</p> <dl class="py data"> <dt class="sig sig-object py" id="xml.sax.handler.feature_namespaces"> <span class="sig-prename descclassname"><span class="pre">xml.sax.handler.</span></span><span class="sig-name descname"><span class="pre">feature_namespaces</span></span><a class="headerlink" href="#xml.sax.handler.feature_namespaces" title="Permalink to this definition">¶</a></dt> <dd><div class="line-block"> <div class="line">value: <code class="docutils literal notranslate"><span class="pre">"http://xml.org/sax/features/namespaces"</span></code></div> <div class="line">true: Perform Namespace processing.</div> <div class="line">false: Optionally do not perform Namespace processing (implies namespace-prefixes; default).</div> <div class="line">access: (parsing) read-only; (not parsing) read/write</div> </div> </dd></dl> <dl class="py data"> <dt class="sig sig-object py" id="xml.sax.handler.feature_namespace_prefixes"> <span class="sig-prename descclassname"><span class="pre">xml.sax.handler.</span></span><span class="sig-name descname"><span class="pre">feature_namespace_prefixes</span></span><a class="headerlink" href="#xml.sax.handler.feature_namespace_prefixes" title="Permalink to this definition">¶</a></dt> <dd><div class="line-block"> <div class="line">value: <code class="docutils literal notranslate"><span class="pre">"http://xml.org/sax/features/namespace-prefixes"</span></code></div> <div class="line">true: Report the original prefixed names and attributes used for Namespace declarations.</div> <div class="line">false: Do not report attributes used for Namespace declarations, and optionally do not report original prefixed names (default).</div> <div class="line">access: (parsing) read-only; (not parsing) read/write</div> </div> </dd></dl> <dl class="py data"> <dt class="sig sig-object py" id="xml.sax.handler.feature_string_interning"> <span class="sig-prename descclassname"><span class="pre">xml.sax.handler.</span></span><span class="sig-name descname"><span class="pre">feature_string_interning</span></span><a class="headerlink" href="#xml.sax.handler.feature_string_interning" title="Permalink to this definition">¶</a></dt> <dd><div class="line-block"> <div class="line">value: <code class="docutils literal notranslate"><span class="pre">"http://xml.org/sax/features/string-interning"</span></code></div> <div class="line">true: All element names, prefixes, attribute names, Namespace URIs, and local names are interned using the built-in intern function.</div> <div class="line">false: Names are not necessarily interned, although they may be (default).</div> <div class="line">access: (parsing) read-only; (not parsing) read/write</div> </div> </dd></dl> <dl class="py data"> <dt class="sig sig-object py" id="xml.sax.handler.feature_validation"> <span class="sig-prename descclassname"><span class="pre">xml.sax.handler.</span></span><span class="sig-name descname"><span class="pre">feature_validation</span></span><a class="headerlink" href="#xml.sax.handler.feature_validation" title="Permalink to this definition">¶</a></dt> <dd><div class="line-block"> <div class="line">value: <code class="docutils literal notranslate"><span class="pre">"http://xml.org/sax/features/validation"</span></code></div> <div class="line">true: Report all validation errors (implies external-general-entities and external-parameter-entities).</div> <div class="line">false: Do not report validation errors.</div> <div class="line">access: (parsing) read-only; (not parsing) read/write</div> </div> </dd></dl> <dl class="py data"> <dt class="sig sig-object py" id="xml.sax.handler.feature_external_ges"> <span class="sig-prename descclassname"><span class="pre">xml.sax.handler.</span></span><span class="sig-name descname"><span class="pre">feature_external_ges</span></span><a class="headerlink" href="#xml.sax.handler.feature_external_ges" title="Permalink to this definition">¶</a></dt> <dd><div class="line-block"> <div class="line">value: <code class="docutils literal notranslate"><span class="pre">"http://xml.org/sax/features/external-general-entities"</span></code></div> <div class="line">true: Include all external general (text) entities.</div> <div class="line">false: Do not include external general entities.</div> <div class="line">access: (parsing) read-only; (not parsing) read/write</div> </div> </dd></dl> <dl class="py data"> <dt class="sig sig-object py" id="xml.sax.handler.feature_external_pes"> <span class="sig-prename descclassname"><span class="pre">xml.sax.handler.</span></span><span class="sig-name descname"><span class="pre">feature_external_pes</span></span><a class="headerlink" href="#xml.sax.handler.feature_external_pes" title="Permalink to this definition">¶</a></dt> <dd><div class="line-block"> <div class="line">value: <code class="docutils literal notranslate"><span class="pre">"http://xml.org/sax/features/external-parameter-entities"</span></code></div> <div class="line">true: Include all external parameter entities, including the external DTD subset.</div> <div class="line">false: Do not include any external parameter entities, even the external DTD subset.</div> <div class="line">access: (parsing) read-only; (not parsing) read/write</div> </div> </dd></dl> <dl class="py data"> <dt class="sig sig-object py" id="xml.sax.handler.all_features"> <span class="sig-prename descclassname"><span class="pre">xml.sax.handler.</span></span><span class="sig-name descname"><span class="pre">all_features</span></span><a class="headerlink" href="#xml.sax.handler.all_features" title="Permalink to this definition">¶</a></dt> <dd><p>List of all features.</p> </dd></dl> <dl class="py data"> <dt class="sig sig-object py" id="xml.sax.handler.property_lexical_handler"> <span class="sig-prename descclassname"><span class="pre">xml.sax.handler.</span></span><span class="sig-name descname"><span class="pre">property_lexical_handler</span></span><a class="headerlink" href="#xml.sax.handler.property_lexical_handler" title="Permalink to this definition">¶</a></dt> <dd><div class="line-block"> <div class="line">value: <code class="docutils literal notranslate"><span class="pre">"http://xml.org/sax/properties/lexical-handler"</span></code></div> <div class="line">data type: xml.sax.sax2lib.LexicalHandler (not supported in Python 2)</div> <div class="line">description: An optional extension handler for lexical events like comments.</div> <div class="line">access: read/write</div> </div> </dd></dl> <dl class="py data"> <dt class="sig sig-object py" id="xml.sax.handler.property_declaration_handler"> <span class="sig-prename descclassname"><span class="pre">xml.sax.handler.</span></span><span class="sig-name descname"><span class="pre">property_declaration_handler</span></span><a class="headerlink" href="#xml.sax.handler.property_declaration_handler" title="Permalink to this definition">¶</a></dt> <dd><div class="line-block"> <div class="line">value: <code class="docutils literal notranslate"><span class="pre">"http://xml.org/sax/properties/declaration-handler"</span></code></div> <div class="line">data type: xml.sax.sax2lib.DeclHandler (not supported in Python 2)</div> <div class="line">description: An optional extension handler for DTD-related events other than notations and unparsed entities.</div> <div class="line">access: read/write</div> </div> </dd></dl> <dl class="py data"> <dt class="sig sig-object py" id="xml.sax.handler.property_dom_node"> <span class="sig-prename descclassname"><span class="pre">xml.sax.handler.</span></span><span class="sig-name descname"><span class="pre">property_dom_node</span></span><a class="headerlink" href="#xml.sax.handler.property_dom_node" title="Permalink to this definition">¶</a></dt> <dd><div class="line-block"> <div class="line">value: <code class="docutils literal notranslate"><span class="pre">"http://xml.org/sax/properties/dom-node"</span></code></div> <div class="line">data type: org.w3c.dom.Node (not supported in Python 2)</div> <div class="line">description: When parsing, the current DOM node being visited if this is a DOM iterator; when not parsing, the root DOM node for iteration.</div> <div class="line">access: (parsing) read-only; (not parsing) read/write</div> </div> </dd></dl> <dl class="py data"> <dt class="sig sig-object py" id="xml.sax.handler.property_xml_string"> <span class="sig-prename descclassname"><span class="pre">xml.sax.handler.</span></span><span class="sig-name descname"><span class="pre">property_xml_string</span></span><a class="headerlink" href="#xml.sax.handler.property_xml_string" title="Permalink to this definition">¶</a></dt> <dd><div class="line-block"> <div class="line">value: <code class="docutils literal notranslate"><span class="pre">"http://xml.org/sax/properties/xml-string"</span></code></div> <div class="line">data type: String</div> <div class="line">description: The literal string of characters that was the source for the current event.</div> <div class="line">access: read-only</div> </div> </dd></dl> <dl class="py data"> <dt class="sig sig-object py" id="xml.sax.handler.all_properties"> <span class="sig-prename descclassname"><span class="pre">xml.sax.handler.</span></span><span class="sig-name descname"><span class="pre">all_properties</span></span><a class="headerlink" href="#xml.sax.handler.all_properties" title="Permalink to this definition">¶</a></dt> <dd><p>List of all known property names.</p> </dd></dl> <section id="contenthandler-objects"> <span id="content-handler-objects"></span><h2><span class="section-number">19.12.1. </span>ContentHandler Objects<a class="headerlink" href="#contenthandler-objects" title="Permalink to this headline">¶</a></h2> <p>Users are expected to subclass <a class="reference internal" href="#xml.sax.handler.ContentHandler" title="xml.sax.handler.ContentHandler"><code class="xref py py-class docutils literal notranslate"><span class="pre">ContentHandler</span></code></a> to support their application. The following methods are called by the parser on the appropriate events in the input document:</p> <dl class="py method"> <dt class="sig sig-object py" id="xml.sax.handler.ContentHandler.setDocumentLocator"> <span class="sig-prename descclassname"><span class="pre">ContentHandler.</span></span><span class="sig-name descname"><span class="pre">setDocumentLocator</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">locator</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#xml.sax.handler.ContentHandler.setDocumentLocator" title="Permalink to this definition">¶</a></dt> <dd><p>Called by the parser to give the application a locator for locating the origin of document events.</p> <p>SAX parsers are strongly encouraged (though not absolutely required) to supply a locator: if it does so, it must supply the locator to the application by invoking this method before invoking any of the other methods in the DocumentHandler interface.</p> <p>The locator allows the application to determine the end position of any document-related event, even if the parser is not reporting an error. Typically, the application will use this information for reporting its own errors (such as character content that does not match an application’s business rules). The information returned by the locator is probably not sufficient for use with a search engine.</p> <p>Note that the locator will return correct information only during the invocation of the events in this interface. The application should not attempt to use it at any other time.</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="xml.sax.handler.ContentHandler.startDocument"> <span class="sig-prename descclassname"><span class="pre">ContentHandler.</span></span><span class="sig-name descname"><span class="pre">startDocument</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#xml.sax.handler.ContentHandler.startDocument" title="Permalink to this definition">¶</a></dt> <dd><p>Receive notification of the beginning of a document.</p> <p>The SAX parser will invoke this method only once, before any other methods in this interface or in DTDHandler (except for <a class="reference internal" href="#xml.sax.handler.ContentHandler.setDocumentLocator" title="xml.sax.handler.ContentHandler.setDocumentLocator"><code class="xref py py-meth docutils literal notranslate"><span class="pre">setDocumentLocator()</span></code></a>).</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="xml.sax.handler.ContentHandler.endDocument"> <span class="sig-prename descclassname"><span class="pre">ContentHandler.</span></span><span class="sig-name descname"><span class="pre">endDocument</span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#xml.sax.handler.ContentHandler.endDocument" title="Permalink to this definition">¶</a></dt> <dd><p>Receive notification of the end of a document.</p> <p>The SAX parser will invoke this method only once, and it will be the last method invoked during the parse. The parser shall not invoke this method until it has either abandoned parsing (because of an unrecoverable error) or reached the end of input.</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="xml.sax.handler.ContentHandler.startPrefixMapping"> <span class="sig-prename descclassname"><span class="pre">ContentHandler.</span></span><span class="sig-name descname"><span class="pre">startPrefixMapping</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">prefix</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">uri</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#xml.sax.handler.ContentHandler.startPrefixMapping" title="Permalink to this definition">¶</a></dt> <dd><p>Begin the scope of a prefix-URI Namespace mapping.</p> <p>The information from this event is not necessary for normal Namespace processing: the SAX XML reader will automatically replace prefixes for element and attribute names when the <code class="docutils literal notranslate"><span class="pre">feature_namespaces</span></code> feature is enabled (the default).</p> <p>There are cases, however, when applications need to use prefixes in character data or in attribute values, where they cannot safely be expanded automatically; the <a class="reference internal" href="#xml.sax.handler.ContentHandler.startPrefixMapping" title="xml.sax.handler.ContentHandler.startPrefixMapping"><code class="xref py py-meth docutils literal notranslate"><span class="pre">startPrefixMapping()</span></code></a> and <a class="reference internal" href="#xml.sax.handler.ContentHandler.endPrefixMapping" title="xml.sax.handler.ContentHandler.endPrefixMapping"><code class="xref py py-meth docutils literal notranslate"><span class="pre">endPrefixMapping()</span></code></a> events supply the information to the application to expand prefixes in those contexts itself, if necessary.</p> <p>Note that <a class="reference internal" href="#xml.sax.handler.ContentHandler.startPrefixMapping" title="xml.sax.handler.ContentHandler.startPrefixMapping"><code class="xref py py-meth docutils literal notranslate"><span class="pre">startPrefixMapping()</span></code></a> and <a class="reference internal" href="#xml.sax.handler.ContentHandler.endPrefixMapping" title="xml.sax.handler.ContentHandler.endPrefixMapping"><code class="xref py py-meth docutils literal notranslate"><span class="pre">endPrefixMapping()</span></code></a> events are not guaranteed to be properly nested relative to each-other: all <a class="reference internal" href="#xml.sax.handler.ContentHandler.startPrefixMapping" title="xml.sax.handler.ContentHandler.startPrefixMapping"><code class="xref py py-meth docutils literal notranslate"><span class="pre">startPrefixMapping()</span></code></a> events will occur before the corresponding <a class="reference internal" href="#xml.sax.handler.ContentHandler.startElement" title="xml.sax.handler.ContentHandler.startElement"><code class="xref py py-meth docutils literal notranslate"><span class="pre">startElement()</span></code></a> event, and all <a class="reference internal" href="#xml.sax.handler.ContentHandler.endPrefixMapping" title="xml.sax.handler.ContentHandler.endPrefixMapping"><code class="xref py py-meth docutils literal notranslate"><span class="pre">endPrefixMapping()</span></code></a> events will occur after the corresponding <a class="reference internal" href="#xml.sax.handler.ContentHandler.endElement" title="xml.sax.handler.ContentHandler.endElement"><code class="xref py py-meth docutils literal notranslate"><span class="pre">endElement()</span></code></a> event, but their order is not guaranteed.</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="xml.sax.handler.ContentHandler.endPrefixMapping"> <span class="sig-prename descclassname"><span class="pre">ContentHandler.</span></span><span class="sig-name descname"><span class="pre">endPrefixMapping</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">prefix</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#xml.sax.handler.ContentHandler.endPrefixMapping" title="Permalink to this definition">¶</a></dt> <dd><p>End the scope of a prefix-URI mapping.</p> <p>See <a class="reference internal" href="#xml.sax.handler.ContentHandler.startPrefixMapping" title="xml.sax.handler.ContentHandler.startPrefixMapping"><code class="xref py py-meth docutils literal notranslate"><span class="pre">startPrefixMapping()</span></code></a> for details. This event will always occur after the corresponding <a class="reference internal" href="#xml.sax.handler.ContentHandler.endElement" title="xml.sax.handler.ContentHandler.endElement"><code class="xref py py-meth docutils literal notranslate"><span class="pre">endElement()</span></code></a> event, but the order of <a class="reference internal" href="#xml.sax.handler.ContentHandler.endPrefixMapping" title="xml.sax.handler.ContentHandler.endPrefixMapping"><code class="xref py py-meth docutils literal notranslate"><span class="pre">endPrefixMapping()</span></code></a> events is not otherwise guaranteed.</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="xml.sax.handler.ContentHandler.startElement"> <span class="sig-prename descclassname"><span class="pre">ContentHandler.</span></span><span class="sig-name descname"><span class="pre">startElement</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">name</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">attrs</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#xml.sax.handler.ContentHandler.startElement" title="Permalink to this definition">¶</a></dt> <dd><p>Signals the start of an element in non-namespace mode.</p> <p>The <em>name</em> parameter contains the raw XML 1.0 name of the element type as a string and the <em>attrs</em> parameter holds an object of the <code class="xref py py-class docutils literal notranslate"><span class="pre">Attributes</span></code> interface (see <a class="reference internal" href="xml.sax.reader.html#attributes-objects"><span class="std std-ref">The Attributes Interface</span></a>) containing the attributes of the element. The object passed as <em>attrs</em> may be re-used by the parser; holding on to a reference to it is not a reliable way to keep a copy of the attributes. To keep a copy of the attributes, use the <a class="reference internal" href="copy.html#module-copy" title="copy: Shallow and deep copy operations."><code class="xref py py-meth docutils literal notranslate"><span class="pre">copy()</span></code></a> method of the <em>attrs</em> object.</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="xml.sax.handler.ContentHandler.endElement"> <span class="sig-prename descclassname"><span class="pre">ContentHandler.</span></span><span class="sig-name descname"><span class="pre">endElement</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">name</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#xml.sax.handler.ContentHandler.endElement" title="Permalink to this definition">¶</a></dt> <dd><p>Signals the end of an element in non-namespace mode.</p> <p>The <em>name</em> parameter contains the name of the element type, just as with the <a class="reference internal" href="#xml.sax.handler.ContentHandler.startElement" title="xml.sax.handler.ContentHandler.startElement"><code class="xref py py-meth docutils literal notranslate"><span class="pre">startElement()</span></code></a> event.</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="xml.sax.handler.ContentHandler.startElementNS"> <span class="sig-prename descclassname"><span class="pre">ContentHandler.</span></span><span class="sig-name descname"><span class="pre">startElementNS</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">name</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">qname</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">attrs</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#xml.sax.handler.ContentHandler.startElementNS" title="Permalink to this definition">¶</a></dt> <dd><p>Signals the start of an element in namespace mode.</p> <p>The <em>name</em> parameter contains the name of the element type as a <code class="docutils literal notranslate"><span class="pre">(uri,</span> <span class="pre">localname)</span></code> tuple, the <em>qname</em> parameter contains the raw XML 1.0 name used in the source document, and the <em>attrs</em> parameter holds an instance of the <code class="xref py py-class docutils literal notranslate"><span class="pre">AttributesNS</span></code> interface (see <a class="reference internal" href="xml.sax.reader.html#attributes-ns-objects"><span class="std std-ref">The AttributesNS Interface</span></a>) containing the attributes of the element. If no namespace is associated with the element, the <em>uri</em> component of <em>name</em> will be <code class="docutils literal notranslate"><span class="pre">None</span></code>. The object passed as <em>attrs</em> may be re-used by the parser; holding on to a reference to it is not a reliable way to keep a copy of the attributes. To keep a copy of the attributes, use the <a class="reference internal" href="copy.html#module-copy" title="copy: Shallow and deep copy operations."><code class="xref py py-meth docutils literal notranslate"><span class="pre">copy()</span></code></a> method of the <em>attrs</em> object.</p> <p>Parsers may set the <em>qname</em> parameter to <code class="docutils literal notranslate"><span class="pre">None</span></code>, unless the <code class="docutils literal notranslate"><span class="pre">feature_namespace_prefixes</span></code> feature is activated.</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="xml.sax.handler.ContentHandler.endElementNS"> <span class="sig-prename descclassname"><span class="pre">ContentHandler.</span></span><span class="sig-name descname"><span class="pre">endElementNS</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">name</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">qname</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#xml.sax.handler.ContentHandler.endElementNS" title="Permalink to this definition">¶</a></dt> <dd><p>Signals the end of an element in namespace mode.</p> <p>The <em>name</em> parameter contains the name of the element type, just as with the <a class="reference internal" href="#xml.sax.handler.ContentHandler.startElementNS" title="xml.sax.handler.ContentHandler.startElementNS"><code class="xref py py-meth docutils literal notranslate"><span class="pre">startElementNS()</span></code></a> method, likewise the <em>qname</em> parameter.</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="xml.sax.handler.ContentHandler.characters"> <span class="sig-prename descclassname"><span class="pre">ContentHandler.</span></span><span class="sig-name descname"><span class="pre">characters</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">content</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#xml.sax.handler.ContentHandler.characters" title="Permalink to this definition">¶</a></dt> <dd><p>Receive notification of character data.</p> <p>The Parser will call this method to report each chunk of character data. SAX parsers may return all contiguous character data in a single chunk, or they may split it into several chunks; however, all of the characters in any single event must come from the same external entity so that the Locator provides useful information.</p> <p><em>content</em> may be a Unicode string or a byte string; the <code class="docutils literal notranslate"><span class="pre">expat</span></code> reader module produces always Unicode strings.</p> <div class="admonition note"> <p class="admonition-title">Note</p> <p>The earlier SAX 1 interface provided by the Python XML Special Interest Group used a more Java-like interface for this method. Since most parsers used from Python did not take advantage of the older interface, the simpler signature was chosen to replace it. To convert old code to the new interface, use <em>content</em> instead of slicing content with the old <em>offset</em> and <em>length</em> parameters.</p> </div> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="xml.sax.handler.ContentHandler.ignorableWhitespace"> <span class="sig-prename descclassname"><span class="pre">ContentHandler.</span></span><span class="sig-name descname"><span class="pre">ignorableWhitespace</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">whitespace</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#xml.sax.handler.ContentHandler.ignorableWhitespace" title="Permalink to this definition">¶</a></dt> <dd><p>Receive notification of ignorable whitespace in element content.</p> <p>Validating Parsers must use this method to report each chunk of ignorable whitespace (see the W3C XML 1.0 recommendation, section 2.10): non-validating parsers may also use this method if they are capable of parsing and using content models.</p> <p>SAX parsers may return all contiguous whitespace in a single chunk, or they may split it into several chunks; however, all of the characters in any single event must come from the same external entity, so that the Locator provides useful information.</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="xml.sax.handler.ContentHandler.processingInstruction"> <span class="sig-prename descclassname"><span class="pre">ContentHandler.</span></span><span class="sig-name descname"><span class="pre">processingInstruction</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">target</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">data</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#xml.sax.handler.ContentHandler.processingInstruction" title="Permalink to this definition">¶</a></dt> <dd><p>Receive notification of a processing instruction.</p> <p>The Parser will invoke this method once for each processing instruction found: note that processing instructions may occur before or after the main document element.</p> <p>A SAX parser should never report an XML declaration (XML 1.0, section 2.8) or a text declaration (XML 1.0, section 4.3.1) using this method.</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="xml.sax.handler.ContentHandler.skippedEntity"> <span class="sig-prename descclassname"><span class="pre">ContentHandler.</span></span><span class="sig-name descname"><span class="pre">skippedEntity</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">name</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#xml.sax.handler.ContentHandler.skippedEntity" title="Permalink to this definition">¶</a></dt> <dd><p>Receive notification of a skipped entity.</p> <p>The Parser will invoke this method once for each entity skipped. Non-validating processors may skip entities if they have not seen the declarations (because, for example, the entity was declared in an external DTD subset). All processors may skip external entities, depending on the values of the <code class="docutils literal notranslate"><span class="pre">feature_external_ges</span></code> and the <code class="docutils literal notranslate"><span class="pre">feature_external_pes</span></code> properties.</p> </dd></dl> </section> <section id="dtdhandler-objects"> <span id="dtd-handler-objects"></span><h2><span class="section-number">19.12.2. </span>DTDHandler Objects<a class="headerlink" href="#dtdhandler-objects" title="Permalink to this headline">¶</a></h2> <p><a class="reference internal" href="#xml.sax.handler.DTDHandler" title="xml.sax.handler.DTDHandler"><code class="xref py py-class docutils literal notranslate"><span class="pre">DTDHandler</span></code></a> instances provide the following methods:</p> <dl class="py method"> <dt class="sig sig-object py" id="xml.sax.handler.DTDHandler.notationDecl"> <span class="sig-prename descclassname"><span class="pre">DTDHandler.</span></span><span class="sig-name descname"><span class="pre">notationDecl</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">name</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">publicId</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">systemId</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#xml.sax.handler.DTDHandler.notationDecl" title="Permalink to this definition">¶</a></dt> <dd><p>Handle a notation declaration event.</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="xml.sax.handler.DTDHandler.unparsedEntityDecl"> <span class="sig-prename descclassname"><span class="pre">DTDHandler.</span></span><span class="sig-name descname"><span class="pre">unparsedEntityDecl</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">name</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">publicId</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">systemId</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">ndata</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#xml.sax.handler.DTDHandler.unparsedEntityDecl" title="Permalink to this definition">¶</a></dt> <dd><p>Handle an unparsed entity declaration event.</p> </dd></dl> </section> <section id="entityresolver-objects"> <span id="entity-resolver-objects"></span><h2><span class="section-number">19.12.3. </span>EntityResolver Objects<a class="headerlink" href="#entityresolver-objects" title="Permalink to this headline">¶</a></h2> <dl class="py method"> <dt class="sig sig-object py" id="xml.sax.handler.EntityResolver.resolveEntity"> <span class="sig-prename descclassname"><span class="pre">EntityResolver.</span></span><span class="sig-name descname"><span class="pre">resolveEntity</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">publicId</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">systemId</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#xml.sax.handler.EntityResolver.resolveEntity" title="Permalink to this definition">¶</a></dt> <dd><p>Resolve the system identifier of an entity and return either the system identifier to read from as a string, or an InputSource to read from. The default implementation returns <em>systemId</em>.</p> </dd></dl> </section> <section id="errorhandler-objects"> <span id="sax-error-handler"></span><h2><span class="section-number">19.12.4. </span>ErrorHandler Objects<a class="headerlink" href="#errorhandler-objects" title="Permalink to this headline">¶</a></h2> <p>Objects with this interface are used to receive error and warning information from the <a class="reference internal" href="xml.sax.reader.html#xml.sax.xmlreader.XMLReader" title="xml.sax.xmlreader.XMLReader"><code class="xref py py-class docutils literal notranslate"><span class="pre">XMLReader</span></code></a>. If you create an object that implements this interface, then register the object with your <a class="reference internal" href="xml.sax.reader.html#xml.sax.xmlreader.XMLReader" title="xml.sax.xmlreader.XMLReader"><code class="xref py py-class docutils literal notranslate"><span class="pre">XMLReader</span></code></a>, the parser will call the methods in your object to report all warnings and errors. There are three levels of errors available: warnings, (possibly) recoverable errors, and unrecoverable errors. All methods take a <code class="xref py py-exc docutils literal notranslate"><span class="pre">SAXParseException</span></code> as the only parameter. Errors and warnings may be converted to an exception by raising the passed-in exception object.</p> <dl class="py method"> <dt class="sig sig-object py" id="xml.sax.handler.ErrorHandler.error"> <span class="sig-prename descclassname"><span class="pre">ErrorHandler.</span></span><span class="sig-name descname"><span class="pre">error</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">exception</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#xml.sax.handler.ErrorHandler.error" title="Permalink to this definition">¶</a></dt> <dd><p>Called when the parser encounters a recoverable error. If this method does not raise an exception, parsing may continue, but further document information should not be expected by the application. Allowing the parser to continue may allow additional errors to be discovered in the input document.</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="xml.sax.handler.ErrorHandler.fatalError"> <span class="sig-prename descclassname"><span class="pre">ErrorHandler.</span></span><span class="sig-name descname"><span class="pre">fatalError</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">exception</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#xml.sax.handler.ErrorHandler.fatalError" title="Permalink to this definition">¶</a></dt> <dd><p>Called when the parser encounters an error it cannot recover from; parsing is expected to terminate when this method returns.</p> </dd></dl> <dl class="py method"> <dt class="sig sig-object py" id="xml.sax.handler.ErrorHandler.warning"> <span class="sig-prename descclassname"><span class="pre">ErrorHandler.</span></span><span class="sig-name descname"><span class="pre">warning</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">exception</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#xml.sax.handler.ErrorHandler.warning" title="Permalink to this definition">¶</a></dt> <dd><p>Called when the parser presents minor warning information to the application. Parsing is expected to continue when this method returns, and document information will continue to be passed to the application. Raising an exception in this method will cause parsing to end.</p> </dd></dl> </section> </section> <div class="clearer"></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="#">19.12. <code class="xref py py-mod docutils literal notranslate"><span class="pre">xml.sax.handler</span></code> — Base classes for SAX handlers</a><ul> <li><a class="reference internal" href="#contenthandler-objects">19.12.1. ContentHandler Objects</a></li> <li><a class="reference internal" href="#dtdhandler-objects">19.12.2. DTDHandler Objects</a></li> <li><a class="reference internal" href="#entityresolver-objects">19.12.3. EntityResolver Objects</a></li> <li><a class="reference internal" href="#errorhandler-objects">19.12.4. ErrorHandler Objects</a></li> </ul> </li> </ul> <h4>Previous topic</h4> <p class="topless"><a href="xml.sax.html" title="previous chapter"><span class="section-number">19.11. </span><code class="xref py py-mod docutils literal notranslate"><span class="pre">xml.sax</span></code> — Support for SAX2 parsers</a></p> <h4>Next topic</h4> <p class="topless"><a href="xml.sax.utils.html" title="next chapter"><span class="section-number">19.13. </span><code class="xref py py-mod docutils literal notranslate"><span class="pre">xml.sax.saxutils</span></code> — SAX Utilities</a></p> <div role="note" aria-label="source link"> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../_sources/library/xml.sax.handler.rst.txt" rel="nofollow">Show Source</a></li> </ul> </div> <div id="searchbox" style="display: none" role="search"> <h3 id="searchlabel">Quick search</h3> <div class="searchformwrapper"> <form class="search" action="../search.html" method="get"> <input type="text" name="q" aria-labelledby="searchlabel" autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false"/> <input type="submit" value="Go" /> </form> </div> </div> <script>$('#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="xml.sax.utils.html" title="19.13. xml.sax.saxutils — SAX Utilities" >next</a> |</li> <li class="right" > <a href="xml.sax.html" title="19.11. xml.sax — Support for SAX2 parsers" >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 2.7.18 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="markup.html" ><span class="section-number">19. </span>Structured Markup Processing Tools</a> »</li> <li class="nav-item nav-item-this"><a href=""><span class="section-number">19.12. </span><code class="xref py py-mod docutils literal notranslate"><span class="pre">xml.sax.handler</span></code> — Base classes for SAX handlers</a></li> </ul> </div> <div class="footer"> © <a href="../copyright.html">Copyright</a> 1990-2024, Python Software Foundation. <br /> The Python Software Foundation is a non-profit corporation. <a href="https://www.python.org/psf/donations/">Please donate.</a> <br /> Last updated on December 09, 2024. <a href="../bugs.html">Found a bug</a>? <br /> Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 4.3.2. </div> </body> </html>
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