mirror of
https://github.com/python/cpython.git
synced 2024-12-16 21:34:44 +08:00
84 lines
2.7 KiB
ReStructuredText
84 lines
2.7 KiB
ReStructuredText
:mod:`email.iterators`: Iterators
|
|
---------------------------------
|
|
|
|
.. module:: email.iterators
|
|
:synopsis: Iterate over a message object tree.
|
|
|
|
**Source code:** :source:`Lib/email/iterators.py`
|
|
|
|
--------------
|
|
|
|
Iterating over a message object tree is fairly easy with the
|
|
:meth:`Message.walk <email.message.Message.walk>` method. The
|
|
:mod:`email.iterators` module provides some useful higher level iterations over
|
|
message object trees.
|
|
|
|
|
|
.. function:: body_line_iterator(msg, decode=False)
|
|
|
|
This iterates over all the payloads in all the subparts of *msg*, returning the
|
|
string payloads line-by-line. It skips over all the subpart headers, and it
|
|
skips over any subpart with a payload that isn't a Python string. This is
|
|
somewhat equivalent to reading the flat text representation of the message from
|
|
a file using :meth:`~io.TextIOBase.readline`, skipping over all the
|
|
intervening headers.
|
|
|
|
Optional *decode* is passed through to :meth:`Message.get_payload
|
|
<email.message.Message.get_payload>`.
|
|
|
|
|
|
.. function:: typed_subpart_iterator(msg, maintype='text', subtype=None)
|
|
|
|
This iterates over all the subparts of *msg*, returning only those subparts that
|
|
match the MIME type specified by *maintype* and *subtype*.
|
|
|
|
Note that *subtype* is optional; if omitted, then subpart MIME type matching is
|
|
done only with the main type. *maintype* is optional too; it defaults to
|
|
:mimetype:`text`.
|
|
|
|
Thus, by default :func:`typed_subpart_iterator` returns each subpart that has a
|
|
MIME type of :mimetype:`text/\*`.
|
|
|
|
|
|
The following function has been added as a useful debugging tool. It should
|
|
*not* be considered part of the supported public interface for the package.
|
|
|
|
.. function:: _structure(msg, fp=None, level=0, include_default=False)
|
|
|
|
Prints an indented representation of the content types of the message object
|
|
structure. For example:
|
|
|
|
.. testsetup::
|
|
|
|
import email
|
|
from email.iterators import _structure
|
|
somefile = open('../Lib/test/test_email/data/msg_02.txt')
|
|
|
|
.. doctest::
|
|
|
|
>>> msg = email.message_from_file(somefile)
|
|
>>> _structure(msg)
|
|
multipart/mixed
|
|
text/plain
|
|
text/plain
|
|
multipart/digest
|
|
message/rfc822
|
|
text/plain
|
|
message/rfc822
|
|
text/plain
|
|
message/rfc822
|
|
text/plain
|
|
message/rfc822
|
|
text/plain
|
|
message/rfc822
|
|
text/plain
|
|
text/plain
|
|
|
|
.. testcleanup::
|
|
|
|
somefile.close()
|
|
|
|
Optional *fp* is a file-like object to print the output to. It must be
|
|
suitable for Python's :func:`print` function. *level* is used internally.
|
|
*include_default*, if true, prints the default type as well.
|