mirror of https://github.com/python/cpython
84 lines
2.7 KiB
ReStructuredText
84 lines
2.7 KiB
ReStructuredText
:mod:`email.iterators`: Iterators
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---------------------------------
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.. module:: email.iterators
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:synopsis: Iterate over a message object tree.
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**Source code:** :source:`Lib/email/iterators.py`
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--------------
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Iterating over a message object tree is fairly easy with the
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:meth:`Message.walk <email.message.Message.walk>` method. The
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:mod:`email.iterators` module provides some useful higher level iterations over
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message object trees.
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.. function:: body_line_iterator(msg, decode=False)
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This iterates over all the payloads in all the subparts of *msg*, returning the
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string payloads line-by-line. It skips over all the subpart headers, and it
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skips over any subpart with a payload that isn't a Python string. This is
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somewhat equivalent to reading the flat text representation of the message from
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a file using :meth:`~io.TextIOBase.readline`, skipping over all the
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intervening headers.
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Optional *decode* is passed through to :meth:`Message.get_payload
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<email.message.Message.get_payload>`.
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.. function:: typed_subpart_iterator(msg, maintype='text', subtype=None)
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This iterates over all the subparts of *msg*, returning only those subparts that
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match the MIME type specified by *maintype* and *subtype*.
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Note that *subtype* is optional; if omitted, then subpart MIME type matching is
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done only with the main type. *maintype* is optional too; it defaults to
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:mimetype:`text`.
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Thus, by default :func:`typed_subpart_iterator` returns each subpart that has a
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MIME type of :mimetype:`text/\*`.
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The following function has been added as a useful debugging tool. It should
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*not* be considered part of the supported public interface for the package.
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.. function:: _structure(msg, fp=None, level=0, include_default=False)
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Prints an indented representation of the content types of the message object
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structure. For example:
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.. testsetup::
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>>> import email
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>>> from email.iterators import _structure
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>>> somefile = open('Lib/test/test_email/data/msg_02.txt')
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.. doctest::
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>>> msg = email.message_from_file(somefile)
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>>> _structure(msg)
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multipart/mixed
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text/plain
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text/plain
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multipart/digest
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message/rfc822
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text/plain
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message/rfc822
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text/plain
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message/rfc822
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text/plain
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message/rfc822
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text/plain
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message/rfc822
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text/plain
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text/plain
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.. testsetup::
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>>> somefile.close()
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Optional *fp* is a file-like object to print the output to. It must be
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suitable for Python's :func:`print` function. *level* is used internally.
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*include_default*, if true, prints the default type as well.
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