`!email.errors`: Exception and Defect classes
email.errors
Source code: Lib/email/errors.py
The following exception classes are defined in the !email.errors module:
MessageError()
This is the base class for all exceptions that the email package can raise. It is derived from the standard Exception class and defines no additional methods.
MessageParseError()
This is the base class for exceptions raised by the ~email.parser.Parser class. It is derived from MessageError. This class is also used internally by the parser used by ~email.headerregistry.
HeaderParseError()
Raised under some error conditions when parsing the 5322 headers of a message, this class is derived from MessageParseError. The ~email.message.EmailMessage.set_boundary method will raise this error if the content type is unknown when the method is called. ~email.header.Header may raise this error for certain base64 decoding errors, and when an attempt is made to create a header that appears to contain an embedded header (that is, there is what is supposed to be a continuation line that has no leading whitespace and looks like a header).
BoundaryError()
Deprecated and no longer used.
MultipartConversionError()
Raised if the ~email.message.Message.attach method is called on an instance of a class derived from ~email.mime.nonmultipart.MIMENonMultipart (e.g. ~email.mime.image.MIMEImage). MultipartConversionError multiply inherits from MessageError and the built-in TypeError.
HeaderWriteError()
Raised when an error occurs when the ~email.generator outputs headers.
MessageDefect()
This is the base class for all defects found when parsing email messages. It is derived from ValueError.
HeaderDefect()
This is the base class for all defects found when parsing email headers. It is derived from MessageDefect.
Here is the list of the defects that the ~email.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 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 email.errors.MessageDefect.
NoBoundaryInMultipartDefect
A message claimed to be a multipart, but had no boundary parameter.
StartBoundaryNotFoundDefect
The start boundary claimed in the Content-Type header was never found.
CloseBoundaryNotFoundDefect
A start boundary was found, but no corresponding close boundary was ever found.
3.3
FirstHeaderLineIsContinuationDefect
The message had a continuation line as its first header line.
MisplacedEnvelopeHeaderDefect
A "Unix From" header was found in the middle of a header block.
MissingHeaderBodySeparatorDefect
A line was found while parsing headers that had no leading white space but contained no ':'. Parsing continues assuming that the line represents the first line of the body.
3.3
MalformedHeaderDefect
A header was found that was missing a colon, or was otherwise malformed.
3.3 This defect has not been used for several Python versions.
MultipartInvariantViolationDefect
A message claimed to be a multipart, but no subparts were found. Note that when a message has this defect, its ~email.message.Message.is_multipart method may return False even though its content type claims to be multipart.
InvalidBase64PaddingDefect
When decoding a block of base64 encoded bytes, the padding was not correct. Enough padding is added to perform the decode, but the resulting decoded bytes may be invalid.
InvalidBase64CharactersDefect
When decoding a block of base64 encoded bytes, characters outside the base64 alphabet were encountered. The characters are ignored, but the resulting decoded bytes may be invalid.
InvalidBase64LengthDefect
When decoding a block of base64 encoded bytes, the number of non-padding base64 characters was invalid (1 more than a multiple of 4). The encoded block was kept as-is.
InvalidDateDefect
When decoding an invalid or unparsable date field. The original value is kept as-is.
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