source: python/vendor/Python-2.6.5/Lib/email/message.py

Last change on this file was 2, checked in by Yuri Dario, 15 years ago

Initial import for vendor code.
  • Property svn:eol-style set to native
File size: 29.6 KB
Line 
1# Copyright (C) 2001-2006 Python Software Foundation
2# Author: Barry Warsaw
3# Contact: email-sig@python.org
4
5"""Basic message object for the email package object model."""
6
7__all__ = ['Message']
8
9import re
10import uu
11import binascii
12import warnings
13from cStringIO import StringIO
14
15# Intrapackage imports
16import email.charset
17from email import utils
18from email import errors
19
20SEMISPACE = '; '
21
22# Regular expression that matches `special' characters in parameters, the
23# existence of which force quoting of the parameter value.
24tspecials = re.compile(r'[ \(\)<>@,;:\\"/\[\]\?=]')
25
26
27# Helper functions
28def _splitparam(param):
29 # Split header parameters. BAW: this may be too simple. It isn't
30 # strictly RFC 2045 (section 5.1) compliant, but it catches most headers
31 # found in the wild. We may eventually need a full fledged parser
32 # eventually.
33 a, sep, b = param.partition(';')
34 if not sep:
35 return a.strip(), None
36 return a.strip(), b.strip()
37
38
39def _formatparam(param, value=None, quote=True):
40 """Convenience function to format and return a key=value pair.
41
42 This will quote the value if needed or if quote is true.
43 """
44 if value is not None and len(value) > 0:
45 # A tuple is used for RFC 2231 encoded parameter values where items
46 # are (charset, language, value). charset is a string, not a Charset
47 # instance.
48 if isinstance(value, tuple):
49 # Encode as per RFC 2231
50 param += '*'
51 value = utils.encode_rfc2231(value[2], value[0], value[1])
52 # BAW: Please check this. I think that if quote is set it should
53 # force quoting even if not necessary.
54 if quote or tspecials.search(value):
55 return '%s="%s"' % (param, utils.quote(value))
56 else:
57 return '%s=%s' % (param, value)
58 else:
59 return param
60
61def _parseparam(s):
62 plist = []
63 while s[:1] == ';':
64 s = s[1:]
65 end = s.find(';')
66 while end > 0 and s.count('"', 0, end) % 2:
67 end = s.find(';', end + 1)
68 if end < 0:
69 end = len(s)
70 f = s[:end]
71 if '=' in f:
72 i = f.index('=')
73 f = f[:i].strip().lower() + '=' + f[i+1:].strip()
74 plist.append(f.strip())
75 s = s[end:]
76 return plist
77
78
79def _unquotevalue(value):
80 # This is different than utils.collapse_rfc2231_value() because it doesn't
81 # try to convert the value to a unicode. Message.get_param() and
82 # Message.get_params() are both currently defined to return the tuple in
83 # the face of RFC 2231 parameters.
84 if isinstance(value, tuple):
85 return value[0], value[1], utils.unquote(value[2])
86 else:
87 return utils.unquote(value)
88
89
90
91
92class Message:
93 """Basic message object.
94
95 A message object is defined as something that has a bunch of RFC 2822
96 headers and a payload. It may optionally have an envelope header
97 (a.k.a. Unix-From or From_ header). If the message is a container (i.e. a
98 multipart or a message/rfc822), then the payload is a list of Message
99 objects, otherwise it is a string.
100
101 Message objects implement part of the `mapping' interface, which assumes
102 there is exactly one occurrance of the header per message. Some headers
103 do in fact appear multiple times (e.g. Received) and for those headers,
104 you must use the explicit API to set or get all the headers. Not all of
105 the mapping methods are implemented.
106 """
107 def __init__(self):
108 self._headers = []
109 self._unixfrom = None
110 self._payload = None
111 self._charset = None
112 # Defaults for multipart messages
113 self.preamble = self.epilogue = None
114 self.defects = []
115 # Default content type
116 self._default_type = 'text/plain'
117
118 def __str__(self):
119 """Return the entire formatted message as a string.
120 This includes the headers, body, and envelope header.
121 """
122 return self.as_string(unixfrom=True)
123
124 def as_string(self, unixfrom=False):
125 """Return the entire formatted message as a string.
126 Optional `unixfrom' when True, means include the Unix From_ envelope
127 header.
128
129 This is a convenience method and may not generate the message exactly
130 as you intend because by default it mangles lines that begin with
131 "From ". For more flexibility, use the flatten() method of a
132 Generator instance.
133 """
134 from email.generator import Generator
135 fp = StringIO()
136 g = Generator(fp)
137 g.flatten(self, unixfrom=unixfrom)
138 return fp.getvalue()
139
140 def is_multipart(self):
141 """Return True if the message consists of multiple parts."""
142 return isinstance(self._payload, list)
143
144 #
145 # Unix From_ line
146 #
147 def set_unixfrom(self, unixfrom):
148 self._unixfrom = unixfrom
149
150 def get_unixfrom(self):
151 return self._unixfrom
152
153 #
154 # Payload manipulation.
155 #
156 def attach(self, payload):
157 """Add the given payload to the current payload.
158
159 The current payload will always be a list of objects after this method
160 is called. If you want to set the payload to a scalar object, use
161 set_payload() instead.
162 """
163 if self._payload is None:
164 self._payload = [payload]
165 else:
166 self._payload.append(payload)
167
168 def get_payload(self, i=None, decode=False):
169 """Return a reference to the payload.
170
171 The payload will either be a list object or a string. If you mutate
172 the list object, you modify the message's payload in place. Optional
173 i returns that index into the payload.
174
175 Optional decode is a flag indicating whether the payload should be
176 decoded or not, according to the Content-Transfer-Encoding header
177 (default is False).
178
179 When True and the message is not a multipart, the payload will be
180 decoded if this header's value is `quoted-printable' or `base64'. If
181 some other encoding is used, or the header is missing, or if the
182 payload has bogus data (i.e. bogus base64 or uuencoded data), the
183 payload is returned as-is.
184
185 If the message is a multipart and the decode flag is True, then None
186 is returned.
187 """
188 if i is None:
189 payload = self._payload
190 elif not isinstance(self._payload, list):
191 raise TypeError('Expected list, got %s' % type(self._payload))
192 else:
193 payload = self._payload[i]
194 if decode:
195 if self.is_multipart():
196 return None
197 cte = self.get('content-transfer-encoding', '').lower()
198 if cte == 'quoted-printable':
199 return utils._qdecode(payload)
200 elif cte == 'base64':
201 try:
202 return utils._bdecode(payload)
203 except binascii.Error:
204 # Incorrect padding
205 return payload
206 elif cte in ('x-uuencode', 'uuencode', 'uue', 'x-uue'):
207 sfp = StringIO()
208 try:
209 uu.decode(StringIO(payload+'\n'), sfp, quiet=True)
210 payload = sfp.getvalue()
211 except uu.Error:
212 # Some decoding problem
213 return payload
214 # Everything else, including encodings with 8bit or 7bit are returned
215 # unchanged.
216 return payload
217
218 def set_payload(self, payload, charset=None):
219 """Set the payload to the given value.
220
221 Optional charset sets the message's default character set. See
222 set_charset() for details.
223 """
224 self._payload = payload
225 if charset is not None:
226 self.set_charset(charset)
227
228 def set_charset(self, charset):
229 """Set the charset of the payload to a given character set.
230
231 charset can be a Charset instance, a string naming a character set, or
232 None. If it is a string it will be converted to a Charset instance.
233 If charset is None, the charset parameter will be removed from the
234 Content-Type field. Anything else will generate a TypeError.
235
236 The message will be assumed to be of type text/* encoded with
237 charset.input_charset. It will be converted to charset.output_charset
238 and encoded properly, if needed, when generating the plain text
239 representation of the message. MIME headers (MIME-Version,
240 Content-Type, Content-Transfer-Encoding) will be added as needed.
241
242 """
243 if charset is None:
244 self.del_param('charset')
245 self._charset = None
246 return
247 if isinstance(charset, basestring):
248 charset = email.charset.Charset(charset)
249 if not isinstance(charset, email.charset.Charset):
250 raise TypeError(charset)
251 # BAW: should we accept strings that can serve as arguments to the
252 # Charset constructor?
253 self._charset = charset
254 if not self.has_key('MIME-Version'):
255 self.add_header('MIME-Version', '1.0')
256 if not self.has_key('Content-Type'):
257 self.add_header('Content-Type', 'text/plain',
258 charset=charset.get_output_charset())
259 else:
260 self.set_param('charset', charset.get_output_charset())
261 if str(charset) != charset.get_output_charset():
262 self._payload = charset.body_encode(self._payload)
263 if not self.has_key('Content-Transfer-Encoding'):
264 cte = charset.get_body_encoding()
265 try:
266 cte(self)
267 except TypeError:
268 self._payload = charset.body_encode(self._payload)
269 self.add_header('Content-Transfer-Encoding', cte)
270
271 def get_charset(self):
272 """Return the Charset instance associated with the message's payload.
273 """
274 return self._charset
275
276 #
277 # MAPPING INTERFACE (partial)
278 #
279 def __len__(self):
280 """Return the total number of headers, including duplicates."""
281 return len(self._headers)
282
283 def __getitem__(self, name):
284 """Get a header value.
285
286 Return None if the header is missing instead of raising an exception.
287
288 Note that if the header appeared multiple times, exactly which
289 occurrance gets returned is undefined. Use get_all() to get all
290 the values matching a header field name.
291 """
292 return self.get(name)
293
294 def __setitem__(self, name, val):
295 """Set the value of a header.
296
297 Note: this does not overwrite an existing header with the same field
298 name. Use __delitem__() first to delete any existing headers.
299 """
300 self._headers.append((name, val))
301
302 def __delitem__(self, name):
303 """Delete all occurrences of a header, if present.
304
305 Does not raise an exception if the header is missing.
306 """
307 name = name.lower()
308 newheaders = []
309 for k, v in self._headers:
310 if k.lower() != name:
311 newheaders.append((k, v))
312 self._headers = newheaders
313
314 def __contains__(self, name):
315 return name.lower() in [k.lower() for k, v in self._headers]
316
317 def has_key(self, name):
318 """Return true if the message contains the header."""
319 missing = object()
320 return self.get(name, missing) is not missing
321
322 def keys(self):
323 """Return a list of all the message's header field names.
324
325 These will be sorted in the order they appeared in the original
326 message, or were added to the message, and may contain duplicates.
327 Any fields deleted and re-inserted are always appended to the header
328 list.
329 """
330 return [k for k, v in self._headers]
331
332 def values(self):
333 """Return a list of all the message's header values.
334
335 These will be sorted in the order they appeared in the original
336 message, or were added to the message, and may contain duplicates.
337 Any fields deleted and re-inserted are always appended to the header
338 list.
339 """
340 return [v for k, v in self._headers]
341
342 def items(self):
343 """Get all the message's header fields and values.
344
345 These will be sorted in the order they appeared in the original
346 message, or were added to the message, and may contain duplicates.
347 Any fields deleted and re-inserted are always appended to the header
348 list.
349 """
350 return self._headers[:]
351
352 def get(self, name, failobj=None):
353 """Get a header value.
354
355 Like __getitem__() but return failobj instead of None when the field
356 is missing.
357 """
358 name = name.lower()
359 for k, v in self._headers:
360 if k.lower() == name:
361 return v
362 return failobj
363
364 #
365 # Additional useful stuff
366 #
367
368 def get_all(self, name, failobj=None):
369 """Return a list of all the values for the named field.
370
371 These will be sorted in the order they appeared in the original
372 message, and may contain duplicates. Any fields deleted and
373 re-inserted are always appended to the header list.
374
375 If no such fields exist, failobj is returned (defaults to None).
376 """
377 values = []
378 name = name.lower()
379 for k, v in self._headers:
380 if k.lower() == name:
381 values.append(v)
382 if not values:
383 return failobj
384 return values
385
386 def add_header(self, _name, _value, **_params):
387 """Extended header setting.
388
389 name is the header field to add. keyword arguments can be used to set
390 additional parameters for the header field, with underscores converted
391 to dashes. Normally the parameter will be added as key="value" unless
392 value is None, in which case only the key will be added.
393
394 Example:
395
396 msg.add_header('content-disposition', 'attachment', filename='bud.gif')
397 """
398 parts = []
399 for k, v in _params.items():
400 if v is None:
401 parts.append(k.replace('_', '-'))
402 else:
403 parts.append(_formatparam(k.replace('_', '-'), v))
404 if _value is not None:
405 parts.insert(0, _value)
406 self._headers.append((_name, SEMISPACE.join(parts)))
407
408 def replace_header(self, _name, _value):
409 """Replace a header.
410
411 Replace the first matching header found in the message, retaining
412 header order and case. If no matching header was found, a KeyError is
413 raised.
414 """
415 _name = _name.lower()
416 for i, (k, v) in zip(range(len(self._headers)), self._headers):
417 if k.lower() == _name:
418 self._headers[i] = (k, _value)
419 break
420 else:
421 raise KeyError(_name)
422
423 #
424 # Use these three methods instead of the three above.
425 #
426
427 def get_content_type(self):
428 """Return the message's content type.
429
430 The returned string is coerced to lower case of the form
431 `maintype/subtype'. If there was no Content-Type header in the
432 message, the default type as given by get_default_type() will be
433 returned. Since according to RFC 2045, messages always have a default
434 type this will always return a value.
435
436 RFC 2045 defines a message's default type to be text/plain unless it
437 appears inside a multipart/digest container, in which case it would be
438 message/rfc822.
439 """
440 missing = object()
441 value = self.get('content-type', missing)
442 if value is missing:
443 # This should have no parameters
444 return self.get_default_type()
445 ctype = _splitparam(value)[0].lower()
446 # RFC 2045, section 5.2 says if its invalid, use text/plain
447 if ctype.count('/') != 1:
448 return 'text/plain'
449 return ctype
450
451 def get_content_maintype(self):
452 """Return the message's main content type.
453
454 This is the `maintype' part of the string returned by
455 get_content_type().
456 """
457 ctype = self.get_content_type()
458 return ctype.split('/')[0]
459
460 def get_content_subtype(self):
461 """Returns the message's sub-content type.
462
463 This is the `subtype' part of the string returned by
464 get_content_type().
465 """
466 ctype = self.get_content_type()
467 return ctype.split('/')[1]
468
469 def get_default_type(self):
470 """Return the `default' content type.
471
472 Most messages have a default content type of text/plain, except for
473 messages that are subparts of multipart/digest containers. Such
474 subparts have a default content type of message/rfc822.
475 """
476 return self._default_type
477
478 def set_default_type(self, ctype):
479 """Set the `default' content type.
480
481 ctype should be either "text/plain" or "message/rfc822", although this
482 is not enforced. The default content type is not stored in the
483 Content-Type header.
484 """
485 self._default_type = ctype
486
487 def _get_params_preserve(self, failobj, header):
488 # Like get_params() but preserves the quoting of values. BAW:
489 # should this be part of the public interface?
490 missing = object()
491 value = self.get(header, missing)
492 if value is missing:
493 return failobj
494 params = []
495 for p in _parseparam(';' + value):
496 try:
497 name, val = p.split('=', 1)
498 name = name.strip()
499 val = val.strip()
500 except ValueError:
501 # Must have been a bare attribute
502 name = p.strip()
503 val = ''
504 params.append((name, val))
505 params = utils.decode_params(params)
506 return params
507
508 def get_params(self, failobj=None, header='content-type', unquote=True):
509 """Return the message's Content-Type parameters, as a list.
510
511 The elements of the returned list are 2-tuples of key/value pairs, as
512 split on the `=' sign. The left hand side of the `=' is the key,
513 while the right hand side is the value. If there is no `=' sign in
514 the parameter the value is the empty string. The value is as
515 described in the get_param() method.
516
517 Optional failobj is the object to return if there is no Content-Type
518 header. Optional header is the header to search instead of
519 Content-Type. If unquote is True, the value is unquoted.
520 """
521 missing = object()
522 params = self._get_params_preserve(missing, header)
523 if params is missing:
524 return failobj
525 if unquote:
526 return [(k, _unquotevalue(v)) for k, v in params]
527 else:
528 return params
529
530 def get_param(self, param, failobj=None, header='content-type',
531 unquote=True):
532 """Return the parameter value if found in the Content-Type header.
533
534 Optional failobj is the object to return if there is no Content-Type
535 header, or the Content-Type header has no such parameter. Optional
536 header is the header to search instead of Content-Type.
537
538 Parameter keys are always compared case insensitively. The return
539 value can either be a string, or a 3-tuple if the parameter was RFC
540 2231 encoded. When it's a 3-tuple, the elements of the value are of
541 the form (CHARSET, LANGUAGE, VALUE). Note that both CHARSET and
542 LANGUAGE can be None, in which case you should consider VALUE to be
543 encoded in the us-ascii charset. You can usually ignore LANGUAGE.
544
545 Your application should be prepared to deal with 3-tuple return
546 values, and can convert the parameter to a Unicode string like so:
547
548 param = msg.get_param('foo')
549 if isinstance(param, tuple):
550 param = unicode(param[2], param[0] or 'us-ascii')
551
552 In any case, the parameter value (either the returned string, or the
553 VALUE item in the 3-tuple) is always unquoted, unless unquote is set
554 to False.
555 """
556 if not self.has_key(header):
557 return failobj
558 for k, v in self._get_params_preserve(failobj, header):
559 if k.lower() == param.lower():
560 if unquote:
561 return _unquotevalue(v)
562 else:
563 return v
564 return failobj
565
566 def set_param(self, param, value, header='Content-Type', requote=True,
567 charset=None, language=''):
568 """Set a parameter in the Content-Type header.
569
570 If the parameter already exists in the header, its value will be
571 replaced with the new value.
572
573 If header is Content-Type and has not yet been defined for this
574 message, it will be set to "text/plain" and the new parameter and
575 value will be appended as per RFC 2045.
576
577 An alternate header can specified in the header argument, and all
578 parameters will be quoted as necessary unless requote is False.
579
580 If charset is specified, the parameter will be encoded according to RFC
581 2231. Optional language specifies the RFC 2231 language, defaulting
582 to the empty string. Both charset and language should be strings.
583 """
584 if not isinstance(value, tuple) and charset:
585 value = (charset, language, value)
586
587 if not self.has_key(header) and header.lower() == 'content-type':
588 ctype = 'text/plain'
589 else:
590 ctype = self.get(header)
591 if not self.get_param(param, header=header):
592 if not ctype:
593 ctype = _formatparam(param, value, requote)
594 else:
595 ctype = SEMISPACE.join(
596 [ctype, _formatparam(param, value, requote)])
597 else:
598 ctype = ''
599 for old_param, old_value in self.get_params(header=header,
600 unquote=requote):
601 append_param = ''
602 if old_param.lower() == param.lower():
603 append_param = _formatparam(param, value, requote)
604 else:
605 append_param = _formatparam(old_param, old_value, requote)
606 if not ctype:
607 ctype = append_param
608 else:
609 ctype = SEMISPACE.join([ctype, append_param])
610 if ctype != self.get(header):
611 del self[header]
612 self[header] = ctype
613
614 def del_param(self, param, header='content-type', requote=True):
615 """Remove the given parameter completely from the Content-Type header.
616
617 The header will be re-written in place without the parameter or its
618 value. All values will be quoted as necessary unless requote is
619 False. Optional header specifies an alternative to the Content-Type
620 header.
621 """
622 if not self.has_key(header):
623 return
624 new_ctype = ''
625 for p, v in self.get_params(header=header, unquote=requote):
626 if p.lower() != param.lower():
627 if not new_ctype:
628 new_ctype = _formatparam(p, v, requote)
629 else:
630 new_ctype = SEMISPACE.join([new_ctype,
631 _formatparam(p, v, requote)])
632 if new_ctype != self.get(header):
633 del self[header]
634 self[header] = new_ctype
635
636 def set_type(self, type, header='Content-Type', requote=True):
637 """Set the main type and subtype for the Content-Type header.
638
639 type must be a string in the form "maintype/subtype", otherwise a
640 ValueError is raised.
641
642 This method replaces the Content-Type header, keeping all the
643 parameters in place. If requote is False, this leaves the existing
644 header's quoting as is. Otherwise, the parameters will be quoted (the
645 default).
646
647 An alternative header can be specified in the header argument. When
648 the Content-Type header is set, we'll always also add a MIME-Version
649 header.
650 """
651 # BAW: should we be strict?
652 if not type.count('/') == 1:
653 raise ValueError
654 # Set the Content-Type, you get a MIME-Version
655 if header.lower() == 'content-type':
656 del self['mime-version']
657 self['MIME-Version'] = '1.0'
658 if not self.has_key(header):
659 self[header] = type
660 return
661 params = self.get_params(header=header, unquote=requote)
662 del self[header]
663 self[header] = type
664 # Skip the first param; it's the old type.
665 for p, v in params[1:]:
666 self.set_param(p, v, header, requote)
667
668 def get_filename(self, failobj=None):
669 """Return the filename associated with the payload if present.
670
671 The filename is extracted from the Content-Disposition header's
672 `filename' parameter, and it is unquoted. If that header is missing
673 the `filename' parameter, this method falls back to looking for the
674 `name' parameter.
675 """
676 missing = object()
677 filename = self.get_param('filename', missing, 'content-disposition')
678 if filename is missing:
679 filename = self.get_param('name', missing, 'content-type')
680 if filename is missing:
681 return failobj
682 return utils.collapse_rfc2231_value(filename).strip()
683
684 def get_boundary(self, failobj=None):
685 """Return the boundary associated with the payload if present.
686
687 The boundary is extracted from the Content-Type header's `boundary'
688 parameter, and it is unquoted.
689 """
690 missing = object()
691 boundary = self.get_param('boundary', missing)
692 if boundary is missing:
693 return failobj
694 # RFC 2046 says that boundaries may begin but not end in w/s
695 return utils.collapse_rfc2231_value(boundary).rstrip()
696
697 def set_boundary(self, boundary):
698 """Set the boundary parameter in Content-Type to 'boundary'.
699
700 This is subtly different than deleting the Content-Type header and
701 adding a new one with a new boundary parameter via add_header(). The
702 main difference is that using the set_boundary() method preserves the
703 order of the Content-Type header in the original message.
704
705 HeaderParseError is raised if the message has no Content-Type header.
706 """
707 missing = object()
708 params = self._get_params_preserve(missing, 'content-type')
709 if params is missing:
710 # There was no Content-Type header, and we don't know what type
711 # to set it to, so raise an exception.
712 raise errors.HeaderParseError('No Content-Type header found')
713 newparams = []
714 foundp = False
715 for pk, pv in params:
716 if pk.lower() == 'boundary':
717 newparams.append(('boundary', '"%s"' % boundary))
718 foundp = True
719 else:
720 newparams.append((pk, pv))
721 if not foundp:
722 # The original Content-Type header had no boundary attribute.
723 # Tack one on the end. BAW: should we raise an exception
724 # instead???
725 newparams.append(('boundary', '"%s"' % boundary))
726 # Replace the existing Content-Type header with the new value
727 newheaders = []
728 for h, v in self._headers:
729 if h.lower() == 'content-type':
730 parts = []
731 for k, v in newparams:
732 if v == '':
733 parts.append(k)
734 else:
735 parts.append('%s=%s' % (k, v))
736 newheaders.append((h, SEMISPACE.join(parts)))
737
738 else:
739 newheaders.append((h, v))
740 self._headers = newheaders
741
742 def get_content_charset(self, failobj=None):
743 """Return the charset parameter of the Content-Type header.
744
745 The returned string is always coerced to lower case. If there is no
746 Content-Type header, or if that header has no charset parameter,
747 failobj is returned.
748 """
749 missing = object()
750 charset = self.get_param('charset', missing)
751 if charset is missing:
752 return failobj
753 if isinstance(charset, tuple):
754 # RFC 2231 encoded, so decode it, and it better end up as ascii.
755 pcharset = charset[0] or 'us-ascii'
756 try:
757 # LookupError will be raised if the charset isn't known to
758 # Python. UnicodeError will be raised if the encoded text
759 # contains a character not in the charset.
760 charset = unicode(charset[2], pcharset).encode('us-ascii')
761 except (LookupError, UnicodeError):
762 charset = charset[2]
763 # charset character must be in us-ascii range
764 try:
765 if isinstance(charset, str):
766 charset = unicode(charset, 'us-ascii')
767 charset = charset.encode('us-ascii')
768 except UnicodeError:
769 return failobj
770 # RFC 2046, $4.1.2 says charsets are not case sensitive
771 return charset.lower()
772
773 def get_charsets(self, failobj=None):
774 """Return a list containing the charset(s) used in this message.
775
776 The returned list of items describes the Content-Type headers'
777 charset parameter for this message and all the subparts in its
778 payload.
779
780 Each item will either be a string (the value of the charset parameter
781 in the Content-Type header of that part) or the value of the
782 'failobj' parameter (defaults to None), if the part does not have a
783 main MIME type of "text", or the charset is not defined.
784
785 The list will contain one string for each part of the message, plus
786 one for the container message (i.e. self), so that a non-multipart
787 message will still return a list of length 1.
788 """
789 return [part.get_content_charset(failobj) for part in self.walk()]
790
791 # I.e. def walk(self): ...
792 from email.iterators import walk
Note: See TracBrowser for help on using the repository browser.