在 Python 2.7.4 的包中，当您转到 时Lib -> email -> errors.py，模块中有一些有趣的东西。
# Copyright (C) 2001-2006 Python Software Foundation
# Author: Barry Warsaw
# Contact: email-sig@python.org
"""email package exception classes."""
class MessageError(Exception):
"""Base class for errors in the email package."""
class MessageParseError(MessageError):
"""Base class for message parsing errors."""
class HeaderParseError(MessageParseError):
"""Error while parsing headers."""
class BoundaryError(MessageParseError):
"""Couldn't find terminating boundary."""
class MultipartConversionError(MessageError, TypeError):
"""Conversion to a multipart is prohibited."""
class CharsetError(MessageError):
"""An illegal charset was given."""
# These are parsing defects which the parser was able to work around.
class MessageDefect:
"""Base class for a message defect."""
def __init__(self, line=None):
self.line = line
class NoBoundaryInMultipartDefect(MessageDefect):
"""A message claimed to be a multipart but had no boundary parameter."""
class StartBoundaryNotFoundDefect(MessageDefect):
"""The claimed start boundary was never found."""
class FirstHeaderLineIsContinuationDefect(MessageDefect):
"""A message had a continuation line as its first header line."""
class MisplacedEnvelopeHeaderDefect(MessageDefect):
"""A 'Unix-from' header was found in the middle of a header block."""
class MalformedHeaderDefect(MessageDefect):
"""Found a header that was missing a colon, or was otherwise malformed."""
class MultipartInvariantViolationDefect(MessageDefect):
"""A message claimed to be a multipart but no subparts were found."""
这是模块的全部内容。除此之外，还有2个非常奇怪的字符没有出现在预览中，也不能复制粘贴。它们看起来像人类的棍子字符（在记事本中），我觉得这很有趣。
其中一个在之前的行中
class MessageError(Exception):
"""Base class for errors in the email package."""
另一个是之后
class CharsetError(MessageError):
"""An illegal charset was given."""
有谁知道这些角色在那里做什么？还是只是我的包裹？