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126 lines
5.1 KiB
ReStructuredText
126 lines
5.1 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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**Source code:** :source:`Lib/email/errors.py`
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--------------
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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
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:class:`~email.parser.Parser` class. It is derived from
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:exc:`MessageError`. This class is also used internally by the parser used
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by :mod:`~email.headerregistry`.
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.. exception:: HeaderParseError()
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Raised under some error conditions when parsing the :rfc:`5322` headers of a
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message, this class is derived from :exc:`MessageParseError`. The
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:meth:`~email.message.EmailMessage.set_boundary` method will raise this
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error if the content type is unknown when the method is called.
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:class:`~email.header.Header` may raise this error for certain base64
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decoding errors, and when an attempt is made to create a header that appears
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to contain an embedded header (that is, there is what is supposed to be a
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continuation line that has no leading whitespace and looks like a header).
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.. exception:: BoundaryError()
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Deprecated and no longer 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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.. exception:: MessageDefect()
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This is the base class for all defects found when parsing email messages.
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It is derived from :exc:`ValueError`.
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.. exception:: HeaderDefect()
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This is the base class for all defects found when parsing email headers.
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It is derived from :exc:`MessageDefect`.
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Here is 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`.
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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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encoded 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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encoded bytes, characters outside the base64 alphabet were encountered.
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The characters are ignored, but the resulting decoded bytes may be invalid.
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* :class:`InvalidBase64LengthDefect` -- When decoding a block of base64 encoded
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bytes, the number of non-padding base64 characters was invalid (1 more than
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a multiple of 4). The encoded block was kept as-is.
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* :class:`InvalidDateDefect` -- When decoding an invalid or unparsable date field.
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The original value is kept as-is.
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