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148 lines
4.9 KiB
ReStructuredText
148 lines
4.9 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 if the :meth:`~email.message.Message.attach` method is called
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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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:exc:`MultipartConversionError` multiply
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inherits from :exc:`MessageError` and the built-in :exc:`TypeError`.
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.. exception:: HeaderWriteError()
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Raised when an error occurs when the :mod:`~email.generator` outputs
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headers.
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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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.. exception:: NoBoundaryInMultipartDefect
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A message claimed to be a multipart, but had no :mimetype:`boundary`
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parameter.
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.. exception:: StartBoundaryNotFoundDefect
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The start boundary claimed in the :mailheader:`Content-Type` header was
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never found.
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.. exception:: CloseBoundaryNotFoundDefect
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A start boundary was found, but no corresponding close boundary was ever
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found.
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.. versionadded:: 3.3
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.. exception:: FirstHeaderLineIsContinuationDefect
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The message had a continuation line as its first header line.
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.. exception:: MisplacedEnvelopeHeaderDefect
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A "Unix From" header was found in the middle of a header block.
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.. exception:: MissingHeaderBodySeparatorDefect
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A line was found while parsing headers that had no leading white space but
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contained no ':'. Parsing continues assuming that the line represents the
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first line of the body.
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.. versionadded:: 3.3
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.. exception:: MalformedHeaderDefect
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A header was found that was missing a colon, 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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.. exception:: MultipartInvariantViolationDefect
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A message claimed to be a :mimetype:`multipart`, but no subparts were found.
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Note that when a message has this defect, its
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:meth:`~email.message.Message.is_multipart` method may return ``False``
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even though its content type claims to be :mimetype:`multipart`.
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.. exception:: InvalidBase64PaddingDefect
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When decoding a block of base64 encoded bytes, the padding was not correct.
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Enough padding is added to perform the decode, but the resulting decoded
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bytes may be invalid.
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.. exception:: InvalidBase64CharactersDefect
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When decoding a block of base64 encoded bytes, characters outside the base64
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alphabet were encountered. The characters are ignored, but the resulting
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decoded bytes may be invalid.
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.. exception:: InvalidBase64LengthDefect
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When decoding a block of base64 encoded bytes, the number of non-padding
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base64 characters was invalid (1 more than a multiple of 4). The encoded
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block was kept as-is.
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.. exception:: InvalidDateDefect
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When decoding an invalid or unparsable date field. The original value is
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kept as-is.
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