cpython/Doc/library/email.errors.rst

93 lines
3.7 KiB
ReStructuredText
Raw Normal View History

:mod:`email.errors`: Exception and Defect classes
-------------------------------------------------
2007-08-15 11:28:01 -03:00
.. module:: email.errors
:synopsis: The exception classes used by the email package.
The following exception classes are defined in the :mod:`email.errors` module:
.. exception:: MessageError()
This is the base class for all exceptions that the :mod:`email` package can
raise. It is derived from the standard :exc:`Exception` class and defines no
additional methods.
.. exception:: MessageParseError()
Merged revisions 82798,82805,83659,83977,84015,84018,84141,84264,84326-84327,84480,84482,84484,84530-84531,84553,84619,84915-84916 via svnmerge from svn+ssh://pythondev@svn.python.org/python/branches/py3k ........ r82798 | georg.brandl | 2010-07-11 11:23:11 +0200 (So, 11 Jul 2010) | 1 line #6774: explain shutdown() behavior varying with platform. ........ r82805 | georg.brandl | 2010-07-11 11:42:10 +0200 (So, 11 Jul 2010) | 1 line #7935: cross-reference to ast.literal_eval() from eval() docs. ........ r83659 | georg.brandl | 2010-08-03 14:06:29 +0200 (Di, 03 Aug 2010) | 1 line Terminology fix: exceptions are raised, except in generator.throw(). ........ r83977 | georg.brandl | 2010-08-13 17:10:49 +0200 (Fr, 13 Aug 2010) | 1 line Fix copy-paste error. ........ r84015 | georg.brandl | 2010-08-14 17:44:34 +0200 (Sa, 14 Aug 2010) | 1 line Add some maintainers. ........ r84018 | georg.brandl | 2010-08-14 17:48:49 +0200 (Sa, 14 Aug 2010) | 1 line Typo fix. ........ r84141 | georg.brandl | 2010-08-17 16:11:59 +0200 (Di, 17 Aug 2010) | 1 line Markup nits. ........ r84264 | georg.brandl | 2010-08-22 22:23:38 +0200 (So, 22 Aug 2010) | 1 line #9649: fix default value description. ........ r84326 | georg.brandl | 2010-08-26 16:30:15 +0200 (Do, 26 Aug 2010) | 1 line #9689: add links from overview to in-depth class API descriptions. ........ r84327 | georg.brandl | 2010-08-26 16:30:56 +0200 (Do, 26 Aug 2010) | 1 line #9681: typo. ........ r84480 | georg.brandl | 2010-09-04 00:33:27 +0200 (Sa, 04 Sep 2010) | 1 line More inclusive title. ........ r84482 | georg.brandl | 2010-09-04 00:40:02 +0200 (Sa, 04 Sep 2010) | 1 line #9760: clarify what context expression is. ........ r84484 | georg.brandl | 2010-09-04 00:49:27 +0200 (Sa, 04 Sep 2010) | 1 line Fix missing word. ........ r84530 | georg.brandl | 2010-09-05 19:07:12 +0200 (So, 05 Sep 2010) | 1 line #9747: fix copy-paste error in getresgid() doc. ........ r84531 | georg.brandl | 2010-09-05 19:09:18 +0200 (So, 05 Sep 2010) | 1 line #9776: fix some spacing. ........ r84553 | georg.brandl | 2010-09-06 08:49:07 +0200 (Mo, 06 Sep 2010) | 1 line #9780: both { and } are not valid fill characters. ........ r84619 | georg.brandl | 2010-09-08 12:43:45 +0200 (Mi, 08 Sep 2010) | 1 line Add Lukasz. ........ r84915 | georg.brandl | 2010-09-20 08:27:02 +0200 (Mo, 20 Sep 2010) | 1 line Fix typo. ........ r84916 | georg.brandl | 2010-09-20 08:29:01 +0200 (Mo, 20 Sep 2010) | 1 line Mention % as string formatting. ........
2010-10-06 06:28:45 -03:00
This is the base class for exceptions raised by the :class:`~email.parser.Parser`
class. It is derived from :exc:`MessageError`.
2007-08-15 11:28:01 -03:00
.. exception:: HeaderParseError()
Raised under some error conditions when parsing the :rfc:`2822` headers of a
message, this class is derived from :exc:`MessageParseError`. It can be raised
from the :meth:`Parser.parse` or :meth:`Parser.parsestr` methods.
Situations where it can be raised include finding an envelope header after the
first :rfc:`2822` header of the message, finding a continuation line before the
first :rfc:`2822` header is found, or finding a line in the headers which is
neither a header or a continuation line.
.. exception:: BoundaryError()
Raised under some error conditions when parsing the :rfc:`2822` headers of a
message, this class is derived from :exc:`MessageParseError`. It can be raised
from the :meth:`Parser.parse` or :meth:`Parser.parsestr` methods.
Situations where it can be raised include not being able to find the starting or
terminating boundary in a :mimetype:`multipart/\*` message when strict parsing
is used.
.. exception:: MultipartConversionError()
Raised when a payload is added to a :class:`Message` object using
:meth:`add_payload`, but the payload is already a scalar and the message's
:mailheader:`Content-Type` main type is not either :mimetype:`multipart` or
missing. :exc:`MultipartConversionError` multiply inherits from
:exc:`MessageError` and the built-in :exc:`TypeError`.
Since :meth:`Message.add_payload` is deprecated, this exception is rarely raised
in practice. However the exception may also be raised if the :meth:`attach`
method is called on an instance of a class derived from
:class:`~email.mime.nonmultipart.MIMENonMultipart` (e.g.
:class:`~email.mime.image.MIMEImage`).
2007-08-15 11:28:01 -03:00
Here's the list of the defects that the :class:`~email.mime.parser.FeedParser`
can find while parsing messages. Note that the defects are added to the message
where the problem was found, so for example, if a message nested inside a
2007-08-15 11:28:01 -03:00
:mimetype:`multipart/alternative` had a malformed header, that nested message
object would have a defect, but the containing messages would not.
All defect classes are subclassed from :class:`email.errors.MessageDefect`, but
this class is *not* an exception!
.. versionadded:: 2.4
All the defect classes were added.
* :class:`NoBoundaryInMultipartDefect` -- A message claimed to be a multipart,
but had no :mimetype:`boundary` parameter.
* :class:`StartBoundaryNotFoundDefect` -- The start boundary claimed in the
:mailheader:`Content-Type` header was never found.
* :class:`FirstHeaderLineIsContinuationDefect` -- The message had a continuation
line as its first header line.
* :class:`MisplacedEnvelopeHeaderDefect` - A "Unix From" header was found in the
middle of a header block.
* :class:`MalformedHeaderDefect` -- A header was found that was missing a colon,
or was otherwise malformed.
* :class:`MultipartInvariantViolationDefect` -- A message claimed to be a
:mimetype:`multipart`, but no subparts were found. Note that when a message has
this defect, its :meth:`is_multipart` method may return false even though its
content type claims to be :mimetype:`multipart`.