"email.errors": Exception and Defect classes
********************************************

**ソースコード:** Lib/email/errors.py

======================================================================

The following exception classes are defined in the "email.errors"
module:

exception email.errors.MessageError

   これは "email" パッケージが送出しうるすべての例外の基底クラスです。
   これは標準の "Exception" クラスから派生しており、追加のメソッドは定
   義されていません。

exception email.errors.MessageParseError

   This is the base class for exceptions raised by the "Parser" class.
   It is derived from "MessageError".  This class is also used
   internally by the parser used by "headerregistry".

exception email.errors.HeaderParseError

   Raised under some error conditions when parsing the **RFC 5322**
   headers of a message, this class is derived from
   "MessageParseError".  The "set_boundary()" method will raise this
   error if the content type is unknown when the method is called.
   "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).

exception email.errors.BoundaryError

   Deprecated and no longer used.

exception email.errors.MultipartConversionError

   Raised if the "attach()" method is called on an instance of a class
   derived from "MIMENonMultipart" (e.g. "MIMEImage").
   "MultipartConversionError" multiply inherits from "MessageError"
   and the built-in "TypeError".

exception email.errors.HeaderWriteError

   Raised when an error occurs when the "generator" outputs headers.

exception email.errors.MessageDefect

   This is the base class for all defects found when parsing email
   messages. It is derived from "ValueError".

exception email.errors.HeaderDefect

   This is the base class for all defects found when parsing email
   headers. It is derived from "MessageDefect".

以下は "FeedParser" がメッセージの解析中に検出する障害 (defect) の一覧
です。これらの障害は、問題が見つかったメッセージに追加されるため、たと
えば *multipart/alternative* 内にあるネストしたメッセージが異常なヘッ
ダをもっていた場合には、そのネストしたメッセージが障害を持っているが、
その親メッセージには障害はないとみなされることに注意してください。

すべての障害クラスは "email.errors.MessageDefect" のサブクラスです。

exception email.errors.NoBoundaryInMultipartDefect

   A message claimed to be a multipart, but had no *boundary*
   parameter.

exception email.errors.StartBoundaryNotFoundDefect

   The start boundary claimed in the *Content-Type* header was never
   found.

exception email.errors.CloseBoundaryNotFoundDefect

   A start boundary was found, but no corresponding close boundary was
   ever found.

   Added in version 3.3.

exception email.errors.FirstHeaderLineIsContinuationDefect

   The message had a continuation line as its first header line.

exception email.errors.MisplacedEnvelopeHeaderDefect

   A "Unix From" header was found in the middle of a header block.

exception email.errors.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.

   Added in version 3.3.

exception email.errors.MalformedHeaderDefect

   A header was found that was missing a colon, or was otherwise
   malformed.

   バージョン 3.3 で非推奨: この欠陥が使われていないPythonバージョンが
   いくつかあります。

exception email.errors.MultipartInvariantViolationDefect

   A message claimed to be a *multipart*, but no subparts were found.
   Note that when a message has this defect, its "is_multipart()"
   method may return "False" even though its content type claims to be
   *multipart*.

exception email.errors.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.

exception email.errors.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.

exception email.errors.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.

exception email.errors.InvalidDateDefect

   When decoding an invalid or unparsable date field.  The original
   value is kept as-is.
