18.1.8. email.errors
: 异常和缺陷类¶
以下异常类在 email.errors
模块中定义:
-
exception
email.errors.
MessageParseError
¶ This is the base class for exceptions raised by the
Parser
class. It is derived fromMessageError
.
-
exception
email.errors.
HeaderParseError
¶ Raised under some error conditions when parsing the RFC 2822 headers of a message, this class is derived from
MessageParseError
. It can be raised from theParser.parse
orParser.parsestr
methods.Situations where it can be raised include finding an envelope header after the first RFC 2822 header of the message, finding a continuation line before the first RFC 2822 header is found, or finding a line in the headers which is neither a header or a continuation line.
-
exception
email.errors.
BoundaryError
¶ Raised under some error conditions when parsing the RFC 2822 headers of a message, this class is derived from
MessageParseError
. It can be raised from theParser.parse
orParser.parsestr
methods.Situations where it can be raised include not being able to find the starting or terminating boundary in a multipart/* message when strict parsing is used.
-
exception
email.errors.
MultipartConversionError
¶ 当使用
add_payload()
将有效负载添加到Message
对象时,有效负载已经是一个标量,而消息的 Content-Type 主类型不是 multipart 或者缺少时触发该异常。MultipartConversionError
多重继承自MessageError
和内置的TypeError
。由于
Message.add_payload()
已被弃用,此异常实际上极少会被引发。 但是如果在派生自MIMENonMultipart
的类 (例如MIMEImage
) 的实例上调用attach()
方法也可以引发此异常。
Here’s the list of the defects that the 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
, but
this class is not an exception!
2.4 新版功能: All the defect classes were added.
NoBoundaryInMultipartDefect
– 一条消息宣称有多个部分,但却没有 boundary 形参。StartBoundaryNotFoundDefect
– 在 Content-Type 标头中宣称的开始边界无法被找到。FirstHeaderLineIsContinuationDefect
– 消息以一个继续行作为其第一个标头行。MisplacedEnvelopeHeaderDefect
- 在标头块中间发现了一个 “Unix From” 标头。MalformedHeaderDefect
– 找到一个缺失了冒号或格式错误的标头。MultipartInvariantViolationDefect
– A message claimed to be a multipart, but no subparts were found. Note that when a message has this defect, itsis_multipart()
method may return false even though its content type claims to be multipart.