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2to3.rst.txt
14.3
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__builtin__.rst.txt
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__future__.rst.txt
4.84
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__main__.rst.txt
535
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_winreg.rst.txt
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abc.rst.txt
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aepack.rst.txt
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aetools.rst.txt
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aetypes.rst.txt
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aifc.rst.txt
6.92
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al.rst.txt
5.18
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allos.rst.txt
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anydbm.rst.txt
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archiving.rst.txt
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argparse.rst.txt
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array.rst.txt
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ast.rst.txt
10.23
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asynchat.rst.txt
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asyncore.rst.txt
12.63
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atexit.rst.txt
3.82
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audioop.rst.txt
10.15
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autogil.rst.txt
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base64.rst.txt
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basehttpserver.rst.txt
10.16
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bastion.rst.txt
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bdb.rst.txt
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binascii.rst.txt
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binhex.rst.txt
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bisect.rst.txt
5.29
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bsddb.rst.txt
7.4
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bz2.rst.txt
7.88
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calendar.rst.txt
11.02
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carbon.rst.txt
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cd.rst.txt
11.69
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cgi.rst.txt
22.32
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cgihttpserver.rst.txt
2.72
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cgitb.rst.txt
2.81
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chunk.rst.txt
4.84
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cmath.rst.txt
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cmd.rst.txt
8.36
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code.rst.txt
6.95
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codecs.rst.txt
65.4
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codeop.rst.txt
3.69
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collections.rst.txt
40.48
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colorpicker.rst.txt
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colorsys.rst.txt
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commands.rst.txt
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compileall.rst.txt
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compiler.rst.txt
36.59
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configparser.rst.txt
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constants.rst.txt
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contextlib.rst.txt
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cookie.rst.txt
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cookielib.rst.txt
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copy.rst.txt
3.27
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copy_reg.rst.txt
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crypt.rst.txt
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crypto.rst.txt
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csv.rst.txt
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ctypes.rst.txt
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curses.ascii.rst.txt
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curses.panel.rst.txt
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curses.rst.txt
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custominterp.rst.txt
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datatypes.rst.txt
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datetime.rst.txt
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dbhash.rst.txt
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dbm.rst.txt
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debug.rst.txt
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decimal.rst.txt
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development.rst.txt
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difflib.rst.txt
30
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dircache.rst.txt
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dis.rst.txt
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distribution.rst.txt
426
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distutils.rst.txt
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dl.rst.txt
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doctest.rst.txt
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docxmlrpcserver.rst.txt
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dumbdbm.rst.txt
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dummy_thread.rst.txt
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dummy_threading.rst.txt
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easydialogs.rst.txt
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email-examples.rst.txt
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email.charset.rst.txt
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email.encoders.rst.txt
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email.errors.rst.txt
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email.generator.rst.txt
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email.header.rst.txt
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email.iterators.rst.txt
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email.message.rst.txt
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email.mime.rst.txt
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email.parser.rst.txt
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email.rst.txt
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email.utils.rst.txt
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ensurepip.rst.txt
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errno.rst.txt
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exceptions.rst.txt
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fcntl.rst.txt
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filecmp.rst.txt
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fileformats.rst.txt
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fileinput.rst.txt
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filesys.rst.txt
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fl.rst.txt
17.23
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fm.rst.txt
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fnmatch.rst.txt
3.03
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formatter.rst.txt
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fpectl.rst.txt
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fpformat.rst.txt
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fractions.rst.txt
5.17
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framework.rst.txt
11.18
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frameworks.rst.txt
378
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ftplib.rst.txt
15.35
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functions.rst.txt
73.75
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functools.rst.txt
7.27
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future_builtins.rst.txt
1.96
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gc.rst.txt
8.8
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gdbm.rst.txt
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gensuitemodule.rst.txt
3.04
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getopt.rst.txt
6.51
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getpass.rst.txt
1.83
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gettext.rst.txt
28.36
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gl.rst.txt
5.87
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glob.rst.txt
2.36
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grp.rst.txt
2.2
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gzip.rst.txt
4.71
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hashlib.rst.txt
7.21
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heapq.rst.txt
12.88
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hmac.rst.txt
3
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hotshot.rst.txt
4.19
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htmllib.rst.txt
7.21
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htmlparser.rst.txt
11.37
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httplib.rst.txt
36.58
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i18n.rst.txt
409
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ic.rst.txt
4.89
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idle.rst.txt
21.66
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imageop.rst.txt
3.91
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imaplib.rst.txt
16.82
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imgfile.rst.txt
2.7
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imghdr.rst.txt
2.57
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imp.rst.txt
12.3
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importlib.rst.txt
1.1
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imputil.rst.txt
6.86
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index.rst.txt
2.23
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inspect.rst.txt
27.49
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internet.rst.txt
950
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intro.rst.txt
2.74
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io.rst.txt
38.11
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ipc.rst.txt
630
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itertools.rst.txt
35.67
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jpeg.rst.txt
3.77
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json.rst.txt
24.95
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keyword.rst.txt
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language.rst.txt
523
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linecache.rst.txt
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locale.rst.txt
24.39
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logging.config.rst.txt
30.82
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logging.handlers.rst.txt
27.49
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logging.rst.txt
45.78
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mac.rst.txt
791
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macos.rst.txt
3.73
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macosa.rst.txt
3.87
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macostools.rst.txt
3.92
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macpath.rst.txt
650
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mailbox.rst.txt
66.53
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mailcap.rst.txt
3.59
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markup.rst.txt
1.22
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marshal.rst.txt
5.56
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math.rst.txt
10.66
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md5.rst.txt
2.75
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mhlib.rst.txt
3.87
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mimetools.rst.txt
4.4
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mimetypes.rst.txt
9.61
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mimewriter.rst.txt
3.28
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mimify.rst.txt
3.44
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miniaeframe.rst.txt
2.5
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misc.rst.txt
248
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mm.rst.txt
447
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mmap.rst.txt
10.24
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modulefinder.rst.txt
3.3
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modules.rst.txt
382
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msilib.rst.txt
18.62
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msvcrt.rst.txt
4.24
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multifile.rst.txt
6.46
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multiprocessing.rst.txt
90.45
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mutex.rst.txt
1.89
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netdata.rst.txt
432
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netrc.rst.txt
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new.rst.txt
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nis.rst.txt
2.06
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nntplib.rst.txt
14.19
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numbers.rst.txt
7.82
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numeric.rst.txt
751
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operator.rst.txt
21.57
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optparse.rst.txt
75.29
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os.path.rst.txt
12.79
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os.rst.txt
80.64
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ossaudiodev.rst.txt
16.9
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othergui.rst.txt
2.66
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parser.rst.txt
15.02
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pdb.rst.txt
15.67
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persistence.rst.txt
826
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pickle.rst.txt
36.39
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pickletools.rst.txt
1.95
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pipes.rst.txt
3.7
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pkgutil.rst.txt
7.53
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platform.rst.txt
9.33
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plistlib.rst.txt
4.04
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popen2.rst.txt
6.86
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poplib.rst.txt
6.07
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posix.rst.txt
3.54
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posixfile.rst.txt
7.03
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pprint.rst.txt
8.86
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profile.rst.txt
27.99
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pty.rst.txt
1.72
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pwd.rst.txt
2.66
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py_compile.rst.txt
2.42
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pyclbr.rst.txt
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pydoc.rst.txt
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pyexpat.rst.txt
28.21
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python.rst.txt
514
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queue.rst.txt
6.87
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quopri.rst.txt
2.61
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random.rst.txt
13.01
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re.rst.txt
53.81
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readline.rst.txt
10.27
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repr.rst.txt
4.61
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resource.rst.txt
9.37
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restricted.rst.txt
3.25
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rexec.rst.txt
11.47
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rfc822.rst.txt
13.71
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rlcompleter.rst.txt
2.44
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robotparser.rst.txt
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runpy.rst.txt
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sched.rst.txt
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scrolledtext.rst.txt
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select.rst.txt
20.26
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sets.rst.txt
14.62
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sgi.rst.txt
322
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sgmllib.rst.txt
10.41
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sha.rst.txt
2.74
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shelve.rst.txt
8.12
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shlex.rst.txt
11.05
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shutil.rst.txt
13.17
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signal.rst.txt
10.47
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simplehttpserver.rst.txt
4.45
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simplexmlrpcserver.rst.txt
10.63
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site.rst.txt
7.7
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smtpd.rst.txt
2.41
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smtplib.rst.txt
14.56
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sndhdr.rst.txt
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socket.rst.txt
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socketserver.rst.txt
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someos.rst.txt
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spwd.rst.txt
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sqlite3.rst.txt
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ssl.rst.txt
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stat.rst.txt
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statvfs.rst.txt
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stdtypes.rst.txt
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string.rst.txt
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stringio.rst.txt
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stringprep.rst.txt
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strings.rst.txt
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struct.rst.txt
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subprocess.rst.txt
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sun.rst.txt
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sunau.rst.txt
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sunaudio.rst.txt
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symbol.rst.txt
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symtable.rst.txt
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sys.rst.txt
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sysconfig.rst.txt
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syslog.rst.txt
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tabnanny.rst.txt
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tarfile.rst.txt
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telnetlib.rst.txt
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tempfile.rst.txt
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termios.rst.txt
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test.rst.txt
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textwrap.rst.txt
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thread.rst.txt
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threading.rst.txt
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time.rst.txt
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timeit.rst.txt
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tix.rst.txt
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tk.rst.txt
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tkinter.rst.txt
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token.rst.txt
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tokenize.rst.txt
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trace.rst.txt
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traceback.rst.txt
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ttk.rst.txt
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tty.rst.txt
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turtle.rst.txt
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types.rst.txt
6.05
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undoc.rst.txt
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unicodedata.rst.txt
5.59
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unittest.rst.txt
81.01
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unix.rst.txt
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urllib.rst.txt
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urllib2.rst.txt
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urlparse.rst.txt
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user.rst.txt
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userdict.rst.txt
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uu.rst.txt
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uuid.rst.txt
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warnings.rst.txt
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wave.rst.txt
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weakref.rst.txt
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webbrowser.rst.txt
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whichdb.rst.txt
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windows.rst.txt
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winsound.rst.txt
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wsgiref.rst.txt
29.85
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xdrlib.rst.txt
7.89
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xml.dom.minidom.rst.txt
10.95
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xml.dom.pulldom.rst.txt
1.53
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xml.dom.rst.txt
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xml.etree.elementtree.rst.txt
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Code Editor : email.message.rst.txt
:mod:`email.message`: Representing an email message --------------------------------------------------- .. module:: email.message :synopsis: The base class representing email messages. The central class in the :mod:`email` package is the :class:`Message` class, imported from the :mod:`email.message` module. It is the base class for the :mod:`email` object model. :class:`Message` provides the core functionality for setting and querying header fields, and for accessing message bodies. Conceptually, a :class:`Message` object consists of *headers* and *payloads*. Headers are :rfc:`2822` style field names and values where the field name and value are separated by a colon. The colon is not part of either the field name or the field value. Headers are stored and returned in case-preserving form but are matched case-insensitively. There may also be a single envelope header, also known as the *Unix-From* header or the ``From_`` header. The payload is either a string in the case of simple message objects or a list of :class:`Message` objects for MIME container documents (e.g. :mimetype:`multipart/\*` and :mimetype:`message/rfc822`). :class:`Message` objects provide a mapping style interface for accessing the message headers, and an explicit interface for accessing both the headers and the payload. It provides convenience methods for generating a flat text representation of the message object tree, for accessing commonly used header parameters, and for recursively walking over the object tree. Here are the methods of the :class:`Message` class: .. class:: Message() The constructor takes no arguments. .. method:: as_string([unixfrom]) Return the entire message flattened as a string. When optional *unixfrom* is ``True``, the envelope header is included in the returned string. *unixfrom* defaults to ``False``. Flattening the message may trigger changes to the :class:`Message` if defaults need to be filled in to complete the transformation to a string (for example, MIME boundaries may be generated or modified). Note that this method is provided as a convenience and may not always format the message the way you want. For example, by default it mangles lines that begin with ``From``. For more flexibility, instantiate a :class:`~email.generator.Generator` instance and use its :meth:`~email.generator.Generator.flatten` method directly. For example:: from cStringIO import StringIO from email.generator import Generator fp = StringIO() g = Generator(fp, mangle_from_=False, maxheaderlen=60) g.flatten(msg) text = fp.getvalue() .. method:: __str__() Equivalent to ``as_string(unixfrom=True)``. .. method:: is_multipart() Return ``True`` if the message's payload is a list of sub-\ :class:`Message` objects, otherwise return ``False``. When :meth:`is_multipart` returns ``False``, the payload should be a string object. .. method:: set_unixfrom(unixfrom) Set the message's envelope header to *unixfrom*, which should be a string. .. method:: get_unixfrom() Return the message's envelope header. Defaults to ``None`` if the envelope header was never set. .. method:: attach(payload) Add the given *payload* to the current payload, which must be ``None`` or a list of :class:`Message` objects before the call. After the call, the payload will always be a list of :class:`Message` objects. If you want to set the payload to a scalar object (e.g. a string), use :meth:`set_payload` instead. .. method:: get_payload([i[, decode]]) Return the current payload, which will be a list of :class:`Message` objects when :meth:`is_multipart` is ``True``, or a string when :meth:`is_multipart` is ``False``. If the payload is a list and you mutate the list object, you modify the message's payload in place. With optional argument *i*, :meth:`get_payload` will return the *i*-th element of the payload, counting from zero, if :meth:`is_multipart` is ``True``. An :exc:`IndexError` will be raised if *i* is less than 0 or greater than or equal to the number of items in the payload. If the payload is a string (i.e. :meth:`is_multipart` is ``False``) and *i* is given, a :exc:`TypeError` is raised. Optional *decode* is a flag indicating whether the payload should be decoded or not, according to the :mailheader:`Content-Transfer-Encoding` header. When ``True`` and the message is not a multipart, the payload will be decoded if this header's value is ``quoted-printable`` or ``base64``. If some other encoding is used, or :mailheader:`Content-Transfer-Encoding` header is missing, or if the payload has bogus base64 data, the payload is returned as-is (undecoded). If the message is a multipart and the *decode* flag is ``True``, then ``None`` is returned. The default for *decode* is ``False``. .. method:: set_payload(payload[, charset]) Set the entire message object's payload to *payload*. It is the client's responsibility to ensure the payload invariants. Optional *charset* sets the message's default character set; see :meth:`set_charset` for details. .. versionchanged:: 2.2.2 *charset* argument added. .. method:: set_charset(charset) Set the character set of the payload to *charset*, which can either be a :class:`~email.charset.Charset` instance (see :mod:`email.charset`), a string naming a character set, or ``None``. If it is a string, it will be converted to a :class:`~email.charset.Charset` instance. If *charset* is ``None``, the ``charset`` parameter will be removed from the :mailheader:`Content-Type` header (the message will not be otherwise modified). Anything else will generate a :exc:`TypeError`. If there is no existing :mailheader:`MIME-Version` header one will be added. If there is no existing :mailheader:`Content-Type` header, one will be added with a value of :mimetype:`text/plain`. Whether the :mailheader:`Content-Type` header already exists or not, its ``charset`` parameter will be set to *charset.output_charset*. If *charset.input_charset* and *charset.output_charset* differ, the payload will be re-encoded to the *output_charset*. If there is no existing :mailheader:`Content-Transfer-Encoding` header, then the payload will be transfer-encoded, if needed, using the specified :class:`~email.charset.Charset`, and a header with the appropriate value will be added. If a :mailheader:`Content-Transfer-Encoding` header already exists, the payload is assumed to already be correctly encoded using that :mailheader:`Content-Transfer-Encoding` and is not modified. The message will be assumed to be of type :mimetype:`text/\*`, with the payload either in unicode or encoded with *charset.input_charset*. It will be encoded or converted to *charset.output_charset* and transfer encoded properly, if needed, when generating the plain text representation of the message. MIME headers (:mailheader:`MIME-Version`, :mailheader:`Content-Type`, :mailheader:`Content-Transfer-Encoding`) will be added as needed. .. versionadded:: 2.2.2 .. method:: get_charset() Return the :class:`~email.charset.Charset` instance associated with the message's payload. .. versionadded:: 2.2.2 The following methods implement a mapping-like interface for accessing the message's :rfc:`2822` headers. Note that there are some semantic differences between these methods and a normal mapping (i.e. dictionary) interface. For example, in a dictionary there are no duplicate keys, but here there may be duplicate message headers. Also, in dictionaries there is no guaranteed order to the keys returned by :meth:`keys`, but in a :class:`Message` object, headers are always returned in the order they appeared in the original message, or were added to the message later. Any header deleted and then re-added are always appended to the end of the header list. These semantic differences are intentional and are biased toward maximal convenience. Note that in all cases, any envelope header present in the message is not included in the mapping interface. .. method:: __len__() Return the total number of headers, including duplicates. .. method:: __contains__(name) Return true if the message object has a field named *name*. Matching is done case-insensitively and *name* should not include the trailing colon. Used for the ``in`` operator, e.g.:: if 'message-id' in myMessage: print 'Message-ID:', myMessage['message-id'] .. method:: __getitem__(name) Return the value of the named header field. *name* should not include the colon field separator. If the header is missing, ``None`` is returned; a :exc:`KeyError` is never raised. Note that if the named field appears more than once in the message's headers, exactly which of those field values will be returned is undefined. Use the :meth:`get_all` method to get the values of all the extant named headers. .. method:: __setitem__(name, val) Add a header to the message with field name *name* and value *val*. The field is appended to the end of the message's existing fields. Note that this does *not* overwrite or delete any existing header with the same name. If you want to ensure that the new header is the only one present in the message with field name *name*, delete the field first, e.g.:: del msg['subject'] msg['subject'] = 'Python roolz!' .. method:: __delitem__(name) Delete all occurrences of the field with name *name* from the message's headers. No exception is raised if the named field isn't present in the headers. .. method:: has_key(name) Return true if the message contains a header field named *name*, otherwise return false. .. method:: keys() Return a list of all the message's header field names. .. method:: values() Return a list of all the message's field values. .. method:: items() Return a list of 2-tuples containing all the message's field headers and values. .. method:: get(name[, failobj]) Return the value of the named header field. This is identical to :meth:`__getitem__` except that optional *failobj* is returned if the named header is missing (defaults to ``None``). Here are some additional useful methods: .. method:: get_all(name[, failobj]) Return a list of all the values for the field named *name*. If there are no such named headers in the message, *failobj* is returned (defaults to ``None``). .. method:: add_header(_name, _value, **_params) Extended header setting. This method is similar to :meth:`__setitem__` except that additional header parameters can be provided as keyword arguments. *_name* is the header field to add and *_value* is the *primary* value for the header. For each item in the keyword argument dictionary *_params*, the key is taken as the parameter name, with underscores converted to dashes (since dashes are illegal in Python identifiers). Normally, the parameter will be added as ``key="value"`` unless the value is ``None``, in which case only the key will be added. If the value contains non-ASCII characters, it must be specified as a three tuple in the format ``(CHARSET, LANGUAGE, VALUE)``, where ``CHARSET`` is a string naming the charset to be used to encode the value, ``LANGUAGE`` can usually be set to ``None`` or the empty string (see :RFC:`2231` for other possibilities), and ``VALUE`` is the string value containing non-ASCII code points. Here's an example:: msg.add_header('Content-Disposition', 'attachment', filename='bud.gif') This will add a header that looks like :: Content-Disposition: attachment; filename="bud.gif" An example with non-ASCII characters:: msg.add_header('Content-Disposition', 'attachment', filename=('iso-8859-1', '', 'Fußballer.ppt')) Which produces :: Content-Disposition: attachment; filename*="iso-8859-1''Fu%DFballer.ppt" .. method:: replace_header(_name, _value) Replace a header. Replace the first header found in the message that matches *_name*, retaining header order and field name case. If no matching header was found, a :exc:`KeyError` is raised. .. versionadded:: 2.2.2 .. method:: get_content_type() Return the message's content type. The returned string is coerced to lower case of the form :mimetype:`maintype/subtype`. If there was no :mailheader:`Content-Type` header in the message the default type as given by :meth:`get_default_type` will be returned. Since according to :rfc:`2045`, messages always have a default type, :meth:`get_content_type` will always return a value. :rfc:`2045` defines a message's default type to be :mimetype:`text/plain` unless it appears inside a :mimetype:`multipart/digest` container, in which case it would be :mimetype:`message/rfc822`. If the :mailheader:`Content-Type` header has an invalid type specification, :rfc:`2045` mandates that the default type be :mimetype:`text/plain`. .. versionadded:: 2.2.2 .. method:: get_content_maintype() Return the message's main content type. This is the :mimetype:`maintype` part of the string returned by :meth:`get_content_type`. .. versionadded:: 2.2.2 .. method:: get_content_subtype() Return the message's sub-content type. This is the :mimetype:`subtype` part of the string returned by :meth:`get_content_type`. .. versionadded:: 2.2.2 .. method:: get_default_type() Return the default content type. Most messages have a default content type of :mimetype:`text/plain`, except for messages that are subparts of :mimetype:`multipart/digest` containers. Such subparts have a default content type of :mimetype:`message/rfc822`. .. versionadded:: 2.2.2 .. method:: set_default_type(ctype) Set the default content type. *ctype* should either be :mimetype:`text/plain` or :mimetype:`message/rfc822`, although this is not enforced. The default content type is not stored in the :mailheader:`Content-Type` header. .. versionadded:: 2.2.2 .. method:: get_params([failobj[, header[, unquote]]]) Return the message's :mailheader:`Content-Type` parameters, as a list. The elements of the returned list are 2-tuples of key/value pairs, as split on the ``'='`` sign. The left hand side of the ``'='`` is the key, while the right hand side is the value. If there is no ``'='`` sign in the parameter the value is the empty string, otherwise the value is as described in :meth:`get_param` and is unquoted if optional *unquote* is ``True`` (the default). Optional *failobj* is the object to return if there is no :mailheader:`Content-Type` header. Optional *header* is the header to search instead of :mailheader:`Content-Type`. .. versionchanged:: 2.2.2 *unquote* argument added. .. method:: get_param(param[, failobj[, header[, unquote]]]) Return the value of the :mailheader:`Content-Type` header's parameter *param* as a string. If the message has no :mailheader:`Content-Type` header or if there is no such parameter, then *failobj* is returned (defaults to ``None``). Optional *header* if given, specifies the message header to use instead of :mailheader:`Content-Type`. Parameter keys are always compared case insensitively. The return value can either be a string, or a 3-tuple if the parameter was :rfc:`2231` encoded. When it's a 3-tuple, the elements of the value are of the form ``(CHARSET, LANGUAGE, VALUE)``. Note that both ``CHARSET`` and ``LANGUAGE`` can be ``None``, in which case you should consider ``VALUE`` to be encoded in the ``us-ascii`` charset. You can usually ignore ``LANGUAGE``. If your application doesn't care whether the parameter was encoded as in :rfc:`2231`, you can collapse the parameter value by calling :func:`email.utils.collapse_rfc2231_value`, passing in the return value from :meth:`get_param`. This will return a suitably decoded Unicode string when the value is a tuple, or the original string unquoted if it isn't. For example:: rawparam = msg.get_param('foo') param = email.utils.collapse_rfc2231_value(rawparam) In any case, the parameter value (either the returned string, or the ``VALUE`` item in the 3-tuple) is always unquoted, unless *unquote* is set to ``False``. .. versionchanged:: 2.2.2 *unquote* argument added, and 3-tuple return value possible. .. method:: set_param(param, value[, header[, requote[, charset[, language]]]]) Set a parameter in the :mailheader:`Content-Type` header. If the parameter already exists in the header, its value will be replaced with *value*. If the :mailheader:`Content-Type` header as not yet been defined for this message, it will be set to :mimetype:`text/plain` and the new parameter value will be appended as per :rfc:`2045`. Optional *header* specifies an alternative header to :mailheader:`Content-Type`, and all parameters will be quoted as necessary unless optional *requote* is ``False`` (the default is ``True``). If optional *charset* is specified, the parameter will be encoded according to :rfc:`2231`. Optional *language* specifies the RFC 2231 language, defaulting to the empty string. Both *charset* and *language* should be strings. .. versionadded:: 2.2.2 .. method:: del_param(param[, header[, requote]]) Remove the given parameter completely from the :mailheader:`Content-Type` header. The header will be re-written in place without the parameter or its value. All values will be quoted as necessary unless *requote* is ``False`` (the default is ``True``). Optional *header* specifies an alternative to :mailheader:`Content-Type`. .. versionadded:: 2.2.2 .. method:: set_type(type[, header][, requote]) Set the main type and subtype for the :mailheader:`Content-Type` header. *type* must be a string in the form :mimetype:`maintype/subtype`, otherwise a :exc:`ValueError` is raised. This method replaces the :mailheader:`Content-Type` header, keeping all the parameters in place. If *requote* is ``False``, this leaves the existing header's quoting as is, otherwise the parameters will be quoted (the default). An alternative header can be specified in the *header* argument. When the :mailheader:`Content-Type` header is set a :mailheader:`MIME-Version` header is also added. .. versionadded:: 2.2.2 .. method:: get_filename([failobj]) Return the value of the ``filename`` parameter of the :mailheader:`Content-Disposition` header of the message. If the header does not have a ``filename`` parameter, this method falls back to looking for the ``name`` parameter on the :mailheader:`Content-Type` header. If neither is found, or the header is missing, then *failobj* is returned. The returned string will always be unquoted as per :func:`email.utils.unquote`. .. method:: get_boundary([failobj]) Return the value of the ``boundary`` parameter of the :mailheader:`Content-Type` header of the message, or *failobj* if either the header is missing, or has no ``boundary`` parameter. The returned string will always be unquoted as per :func:`email.utils.unquote`. .. method:: set_boundary(boundary) Set the ``boundary`` parameter of the :mailheader:`Content-Type` header to *boundary*. :meth:`set_boundary` will always quote *boundary* if necessary. A :exc:`~email.errors.HeaderParseError` is raised if the message object has no :mailheader:`Content-Type` header. Note that using this method is subtly different than deleting the old :mailheader:`Content-Type` header and adding a new one with the new boundary via :meth:`add_header`, because :meth:`set_boundary` preserves the order of the :mailheader:`Content-Type` header in the list of headers. However, it does *not* preserve any continuation lines which may have been present in the original :mailheader:`Content-Type` header. .. method:: get_content_charset([failobj]) Return the ``charset`` parameter of the :mailheader:`Content-Type` header, coerced to lower case. If there is no :mailheader:`Content-Type` header, or if that header has no ``charset`` parameter, *failobj* is returned. Note that this method differs from :meth:`get_charset` which returns the :class:`~email.charset.Charset` instance for the default encoding of the message body. .. versionadded:: 2.2.2 .. method:: get_charsets([failobj]) Return a list containing the character set names in the message. If the message is a :mimetype:`multipart`, then the list will contain one element for each subpart in the payload, otherwise, it will be a list of length 1. Each item in the list will be a string which is the value of the ``charset`` parameter in the :mailheader:`Content-Type` header for the represented subpart. However, if the subpart has no :mailheader:`Content-Type` header, no ``charset`` parameter, or is not of the :mimetype:`text` main MIME type, then that item in the returned list will be *failobj*. .. method:: walk() The :meth:`walk` method is an all-purpose generator which can be used to iterate over all the parts and subparts of a message object tree, in depth-first traversal order. You will typically use :meth:`walk` as the iterator in a ``for`` loop; each iteration returns the next subpart. Here's an example that prints the MIME type of every part of a multipart message structure:: >>> for part in msg.walk(): ... print part.get_content_type() multipart/report text/plain message/delivery-status text/plain text/plain message/rfc822 .. versionchanged:: 2.5 The previously deprecated methods :meth:`get_type`, :meth:`get_main_type`, and :meth:`get_subtype` were removed. :class:`Message` objects can also optionally contain two instance attributes, which can be used when generating the plain text of a MIME message. .. attribute:: preamble The format of a MIME document allows for some text between the blank line following the headers, and the first multipart boundary string. Normally, this text is never visible in a MIME-aware mail reader because it falls outside the standard MIME armor. However, when viewing the raw text of the message, or when viewing the message in a non-MIME aware reader, this text can become visible. The *preamble* attribute contains this leading extra-armor text for MIME documents. When the :class:`~email.parser.Parser` discovers some text after the headers but before the first boundary string, it assigns this text to the message's *preamble* attribute. When the :class:`~email.generator.Generator` is writing out the plain text representation of a MIME message, and it finds the message has a *preamble* attribute, it will write this text in the area between the headers and the first boundary. See :mod:`email.parser` and :mod:`email.generator` for details. Note that if the message object has no preamble, the *preamble* attribute will be ``None``. .. attribute:: epilogue The *epilogue* attribute acts the same way as the *preamble* attribute, except that it contains text that appears between the last boundary and the end of the message. .. versionchanged:: 2.5 You do not need to set the epilogue to the empty string in order for the :class:`~email.generator.Generator` to print a newline at the end of the file. .. attribute:: defects The *defects* attribute contains a list of all the problems found when parsing this message. See :mod:`email.errors` for a detailed description of the possible parsing defects. .. versionadded:: 2.4
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