1 :mod:`email`: Iterators
2 -----------------------
4 .. module:: email.iterators
5 :synopsis: Iterate over a message object tree.
8 Iterating over a message object tree is fairly easy with the
9 :meth:`Message.walk` method. The :mod:`email.iterators` module provides some
10 useful higher level iterations over message object trees.
13 .. function:: body_line_iterator(msg[, decode])
15 This iterates over all the payloads in all the subparts of *msg*, returning the
16 string payloads line-by-line. It skips over all the subpart headers, and it
17 skips over any subpart with a payload that isn't a Python string. This is
18 somewhat equivalent to reading the flat text representation of the message from
19 a file using :meth:`readline`, skipping over all the intervening headers.
21 Optional *decode* is passed through to :meth:`Message.get_payload`.
24 .. function:: typed_subpart_iterator(msg[, maintype[, subtype]])
26 This iterates over all the subparts of *msg*, returning only those subparts that
27 match the MIME type specified by *maintype* and *subtype*.
29 Note that *subtype* is optional; if omitted, then subpart MIME type matching is
30 done only with the main type. *maintype* is optional too; it defaults to
33 Thus, by default :func:`typed_subpart_iterator` returns each subpart that has a
34 MIME type of :mimetype:`text/\*`.
36 The following function has been added as a useful debugging tool. It should
37 *not* be considered part of the supported public interface for the package.
40 .. function:: _structure(msg[, fp[, level]])
42 Prints an indented representation of the content types of the message object
43 structure. For example::
45 >>> msg = email.message_from_file(somefile)
63 Optional *fp* is a file-like object to print the output to. It must be suitable
64 for Python's extended print statement. *level* is used internally.