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+:mod:`email`: Iterators
+-----------------------
+
+.. module:: email.iterators
+ :synopsis: Iterate over a message object tree.
+
+
+Iterating over a message object tree is fairly easy with the
+:meth:`Message.walk` method. The :mod:`email.iterators` module provides some
+useful higher level iterations over message object trees.
+
+
+.. function:: body_line_iterator(msg[, decode])
+
+ 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:`readline`, skipping over all the intervening headers.
+
+ Optional *decode* is passed through to :meth:`Message.get_payload`.
+
+
+.. function:: typed_subpart_iterator(msg[, maintype[, subtype]])
+
+ 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[, level]])
+
+ Prints an indented representation of the content types of the message object
+ structure. For example::
+
+ >>> 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
+
+ Optional *fp* is a file-like object to print the output to. It must be suitable
+ for Python's extended print statement. *level* is used internally.
+