author | martin.trojer@nokia.com |
Fri, 31 Jul 2009 15:01:17 +0100 | |
changeset 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
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:mod:`email`: Parsing email messages |
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------------------------------------ |
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.. module:: email.parser |
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:synopsis: Parse flat text email messages to produce a message object structure. |
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Message object structures can be created in one of two ways: they can be created |
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from whole cloth by instantiating :class:`Message` objects and stringing them |
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together via :meth:`attach` and :meth:`set_payload` calls, or they can be |
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created by parsing a flat text representation of the email message. |
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The :mod:`email` package provides a standard parser that understands most email |
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document structures, including MIME documents. You can pass the parser a string |
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or a file object, and the parser will return to you the root :class:`Message` |
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instance of the object structure. For simple, non-MIME messages the payload of |
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this root object will likely be a string containing the text of the message. |
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For MIME messages, the root object will return ``True`` from its |
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:meth:`is_multipart` method, and the subparts can be accessed via the |
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:meth:`get_payload` and :meth:`walk` methods. |
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There are actually two parser interfaces available for use, the classic |
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:class:`Parser` API and the incremental :class:`FeedParser` API. The classic |
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:class:`Parser` API is fine if you have the entire text of the message in memory |
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as a string, or if the entire message lives in a file on the file system. |
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:class:`FeedParser` is more appropriate for when you're reading the message from |
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a stream which might block waiting for more input (e.g. reading an email message |
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from a socket). The :class:`FeedParser` can consume and parse the message |
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incrementally, and only returns the root object when you close the parser [#]_. |
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Note that the parser can be extended in limited ways, and of course you can |
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implement your own parser completely from scratch. There is no magical |
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connection between the :mod:`email` package's bundled parser and the |
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:class:`Message` class, so your custom parser can create message object trees |
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any way it finds necessary. |
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FeedParser API |
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^^^^^^^^^^^^^^ |
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.. versionadded:: 2.4 |
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The :class:`FeedParser`, imported from the :mod:`email.feedparser` module, |
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provides an API that is conducive to incremental parsing of email messages, such |
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as would be necessary when reading the text of an email message from a source |
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that can block (e.g. a socket). The :class:`FeedParser` can of course be used |
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to parse an email message fully contained in a string or a file, but the classic |
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:class:`Parser` API may be more convenient for such use cases. The semantics |
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and results of the two parser APIs are identical. |
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The :class:`FeedParser`'s API is simple; you create an instance, feed it a bunch |
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of text until there's no more to feed it, then close the parser to retrieve the |
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root message object. The :class:`FeedParser` is extremely accurate when parsing |
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standards-compliant messages, and it does a very good job of parsing |
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non-compliant messages, providing information about how a message was deemed |
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broken. It will populate a message object's *defects* attribute with a list of |
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any problems it found in a message. See the :mod:`email.errors` module for the |
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list of defects that it can find. |
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Here is the API for the :class:`FeedParser`: |
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.. class:: FeedParser([_factory]) |
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Create a :class:`FeedParser` instance. Optional *_factory* is a no-argument |
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callable that will be called whenever a new message object is needed. It |
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defaults to the :class:`email.message.Message` class. |
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.. method:: feed(data) |
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Feed the :class:`FeedParser` some more data. *data* should be a string |
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containing one or more lines. The lines can be partial and the |
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:class:`FeedParser` will stitch such partial lines together properly. The |
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lines in the string can have any of the common three line endings, |
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carriage return, newline, or carriage return and newline (they can even be |
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mixed). |
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.. method:: close() |
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Closing a :class:`FeedParser` completes the parsing of all previously fed |
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data, and returns the root message object. It is undefined what happens |
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if you feed more data to a closed :class:`FeedParser`. |
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Parser class API |
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^^^^^^^^^^^^^^^^ |
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The :class:`Parser` class, imported from the :mod:`email.parser` module, |
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provides an API that can be used to parse a message when the complete contents |
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of the message are available in a string or file. The :mod:`email.parser` |
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module also provides a second class, called :class:`HeaderParser` which can be |
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used if you're only interested in the headers of the message. |
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:class:`HeaderParser` can be much faster in these situations, since it does not |
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attempt to parse the message body, instead setting the payload to the raw body |
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as a string. :class:`HeaderParser` has the same API as the :class:`Parser` |
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class. |
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.. class:: Parser([_class]) |
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The constructor for the :class:`Parser` class takes an optional argument |
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*_class*. This must be a callable factory (such as a function or a class), and |
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it is used whenever a sub-message object needs to be created. It defaults to |
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:class:`Message` (see :mod:`email.message`). The factory will be called without |
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arguments. |
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108 |
|
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The optional *strict* flag is ignored. |
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110 |
|
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111 |
.. deprecated:: 2.4 |
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Because the :class:`Parser` class is a backward compatible API wrapper |
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around the new-in-Python 2.4 :class:`FeedParser`, *all* parsing is |
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effectively non-strict. You should simply stop passing a *strict* flag to |
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the :class:`Parser` constructor. |
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116 |
|
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.. versionchanged:: 2.2.2 |
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The *strict* flag was added. |
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119 |
|
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.. versionchanged:: 2.4 |
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The *strict* flag was deprecated. |
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122 |
|
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The other public :class:`Parser` methods are: |
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124 |
|
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125 |
|
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.. method:: parse(fp[, headersonly]) |
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127 |
|
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Read all the data from the file-like object *fp*, parse the resulting |
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text, and return the root message object. *fp* must support both the |
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:meth:`readline` and the :meth:`read` methods on file-like objects. |
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131 |
|
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The text contained in *fp* must be formatted as a block of :rfc:`2822` |
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style headers and header continuation lines, optionally preceded by a |
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envelope header. The header block is terminated either by the end of the |
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data or by a blank line. Following the header block is the body of the |
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message (which may contain MIME-encoded subparts). |
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137 |
|
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Optional *headersonly* is as with the :meth:`parse` method. |
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139 |
|
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.. versionchanged:: 2.2.2 |
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The *headersonly* flag was added. |
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142 |
|
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143 |
|
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.. method:: parsestr(text[, headersonly]) |
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145 |
|
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Similar to the :meth:`parse` method, except it takes a string object |
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instead of a file-like object. Calling this method on a string is exactly |
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equivalent to wrapping *text* in a :class:`StringIO` instance first and |
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calling :meth:`parse`. |
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150 |
|
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Optional *headersonly* is a flag specifying whether to stop parsing after |
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reading the headers or not. The default is ``False``, meaning it parses |
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the entire contents of the file. |
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154 |
|
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.. versionchanged:: 2.2.2 |
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The *headersonly* flag was added. |
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157 |
|
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Since creating a message object structure from a string or a file object is such |
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a common task, two functions are provided as a convenience. They are available |
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in the top-level :mod:`email` package namespace. |
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161 |
|
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.. currentmodule:: email |
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163 |
|
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.. function:: message_from_string(s[, _class[, strict]]) |
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165 |
|
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Return a message object structure from a string. This is exactly equivalent to |
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``Parser().parsestr(s)``. Optional *_class* and *strict* are interpreted as |
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with the :class:`Parser` class constructor. |
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169 |
|
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.. versionchanged:: 2.2.2 |
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The *strict* flag was added. |
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172 |
|
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173 |
|
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.. function:: message_from_file(fp[, _class[, strict]]) |
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175 |
|
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Return a message object structure tree from an open file object. This is |
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exactly equivalent to ``Parser().parse(fp)``. Optional *_class* and *strict* |
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are interpreted as with the :class:`Parser` class constructor. |
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179 |
|
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.. versionchanged:: 2.2.2 |
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181 |
The *strict* flag was added. |
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182 |
|
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Here's an example of how you might use this at an interactive Python prompt:: |
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184 |
|
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>>> import email |
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>>> msg = email.message_from_string(myString) |
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187 |
|
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188 |
|
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189 |
Additional notes |
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^^^^^^^^^^^^^^^^ |
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191 |
|
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Here are some notes on the parsing semantics: |
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193 |
|
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* Most non-\ :mimetype:`multipart` type messages are parsed as a single message |
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object with a string payload. These objects will return ``False`` for |
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:meth:`is_multipart`. Their :meth:`get_payload` method will return a string |
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197 |
object. |
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198 |
|
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199 |
* All :mimetype:`multipart` type messages will be parsed as a container message |
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|
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object with a list of sub-message objects for their payload. The outer |
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container message will return ``True`` for :meth:`is_multipart` and their |
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:meth:`get_payload` method will return the list of :class:`Message` subparts. |
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203 |
|
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* Most messages with a content type of :mimetype:`message/\*` (e.g. |
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:mimetype:`message/delivery-status` and :mimetype:`message/rfc822`) will also be |
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parsed as container object containing a list payload of length 1. Their |
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|
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:meth:`is_multipart` method will return ``True``. The single element in the |
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list payload will be a sub-message object. |
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209 |
|
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* Some non-standards compliant messages may not be internally consistent about |
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their :mimetype:`multipart`\ -edness. Such messages may have a |
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:mailheader:`Content-Type` header of type :mimetype:`multipart`, but their |
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:meth:`is_multipart` method may return ``False``. If such messages were parsed |
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with the :class:`FeedParser`, they will have an instance of the |
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:class:`MultipartInvariantViolationDefect` class in their *defects* attribute |
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list. See :mod:`email.errors` for details. |
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.. rubric:: Footnotes |
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.. [#] As of email package version 3.0, introduced in Python 2.4, the classic |
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:class:`Parser` was re-implemented in terms of the :class:`FeedParser`, so the |
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semantics and results are identical between the two parsers. |
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