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113 lines
4.8 KiB
ReStructuredText
113 lines
4.8 KiB
ReStructuredText
:mod:`email.errors`: Exception and Defect classes
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-------------------------------------------------
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.. module:: email.errors
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:synopsis: The exception classes used by the email package.
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The following exception classes are defined in the :mod:`email.errors` module:
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.. exception:: MessageError()
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This is the base class for all exceptions that the :mod:`email` package can
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raise. It is derived from the standard :exc:`Exception` class and defines no
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additional methods.
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.. exception:: MessageParseError()
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This is the base class for exceptions raised by the :class:`~email.parser.Parser`
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class. It is derived from :exc:`MessageError`.
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.. exception:: HeaderParseError()
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Raised under some error conditions when parsing the :rfc:`2822` headers of a
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message, this class is derived from :exc:`MessageParseError`. It can be raised
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from the :meth:`Parser.parse <email.parser.Parser.parse>` or
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:meth:`Parser.parsestr <email.parser.Parser.parsestr>` methods.
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Situations where it can be raised include finding an envelope header after the
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first :rfc:`2822` header of the message, finding a continuation line before the
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first :rfc:`2822` header is found, or finding a line in the headers which is
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neither a header or a continuation line.
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.. exception:: BoundaryError()
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Raised under some error conditions when parsing the :rfc:`2822` headers of a
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message, this class is derived from :exc:`MessageParseError`. It can be raised
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from the :meth:`Parser.parse <email.parser.Parser.parse>` or
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:meth:`Parser.parsestr <email.parser.Parser.parsestr>` methods.
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Situations where it can be raised include not being able to find the starting or
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terminating boundary in a :mimetype:`multipart/\*` message when strict parsing
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is used.
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.. exception:: MultipartConversionError()
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Raised when a payload is added to a :class:`~email.message.Message` object
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using :meth:`add_payload`, but the payload is already a scalar and the
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message's :mailheader:`Content-Type` main type is not either
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:mimetype:`multipart` or missing. :exc:`MultipartConversionError` multiply
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inherits from :exc:`MessageError` and the built-in :exc:`TypeError`.
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Since :meth:`Message.add_payload` is deprecated, this exception is rarely
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raised in practice. However the exception may also be raised if the
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:meth:`~email.message.Message.attach`
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method is called on an instance of a class derived from
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:class:`~email.mime.nonmultipart.MIMENonMultipart` (e.g.
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:class:`~email.mime.image.MIMEImage`).
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Here's the list of the defects that the :class:`~email.parser.FeedParser`
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can find while parsing messages. Note that the defects are added to the message
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where the problem was found, so for example, if a message nested inside a
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:mimetype:`multipart/alternative` had a malformed header, that nested message
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object would have a defect, but the containing messages would not.
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All defect classes are subclassed from :class:`email.errors.MessageDefect`, but
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this class is *not* an exception!
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* :class:`NoBoundaryInMultipartDefect` -- A message claimed to be a multipart,
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but had no :mimetype:`boundary` parameter.
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* :class:`StartBoundaryNotFoundDefect` -- The start boundary claimed in the
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:mailheader:`Content-Type` header was never found.
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* :class:`CloseBoundaryNotFoundDefect` -- A start boundary was found, but
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no corresponding close boundary was ever found.
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.. versionadded:: 3.3
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* :class:`FirstHeaderLineIsContinuationDefect` -- The message had a continuation
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line as its first header line.
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* :class:`MisplacedEnvelopeHeaderDefect` - A "Unix From" header was found in the
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middle of a header block.
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* :class:`MissingHeaderBodySeparatorDefect` - A line was found while parsing
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headers that had no leading white space but contained no ':'. Parsing
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continues assuming that the line represents the first line of the body.
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.. versionadded:: 3.3
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* :class:`MalformedHeaderDefect` -- A header was found that was missing a colon,
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or was otherwise malformed.
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.. deprecated:: 3.3
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This defect has not been used for several Python versions.
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* :class:`MultipartInvariantViolationDefect` -- A message claimed to be a
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:mimetype:`multipart`, but no subparts were found. Note that when a message
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has this defect, its :meth:`~email.message.Message.is_multipart` method may
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return false even though its content type claims to be :mimetype:`multipart`.
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* :class:`InvalidBase64PaddingDefect` -- When decoding a block of base64
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enocded bytes, the padding was not correct. Enough padding is added to
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perform the decode, but the resulting decoded bytes may be invalid.
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* :class:`InvalidBase64CharactersDefect` -- When decoding a block of base64
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enocded bytes, characters outside the base64 alphebet were encountered.
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The characters are ignored, but the resulting decoded bytes may be invalid.
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