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<H2><A NAME="SECTION00142100000000000000000">
12.2.10 Iterators</A>
</H2>
<A NAME="module-email.Iterators"></A>

<P>
Iterating over a message object tree is fairly easy with the
<tt class="method">Message.walk()</tt> method.  The <tt class="module">email.Iterators</tt> module
provides some useful higher level iterations over message object
trees.

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-3957' xml:id='l2h-3957' class="function">body_line_iterator</tt></b>(</nobr></td>
  <td><var>msg</var><big>[</big><var>, decode</var><big>]</big><var></var>)</td></tr></table></dt>
<dd>
This iterates over all the payloads in all the subparts of <var>msg</var>,
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
<tt class="method">readline()</tt>, skipping over all the intervening headers.

<P>
Optional <var>decode</var> is passed through to <tt class="method">Message.get_payload()</tt>.
</dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-3958' xml:id='l2h-3958' class="function">typed_subpart_iterator</tt></b>(</nobr></td>
  <td><var>msg</var><big>[</big><var>,
    maintype</var><big>[</big><var>, subtype</var><big>]</big><var></var><big>]</big><var></var>)</td></tr></table></dt>
<dd>
This iterates over all the subparts of <var>msg</var>, returning only those
subparts that match the MIME type specified by <var>maintype</var> and
<var>subtype</var>.

<P>
Note that <var>subtype</var> is optional; if omitted, then subpart MIME
type matching is done only with the main type.  <var>maintype</var> is
optional too; it defaults to <span class="mimetype">text</span>.

<P>
Thus, by default <tt class="function">typed_subpart_iterator()</tt> returns each
subpart that has a MIME type of <span class="mimetype">text/*</span>.
</dl>

<P>
The following function has been added as a useful debugging tool.  It
should <em>not</em> be considered part of the supported public interface
for the package.

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><tt id='l2h-3959' xml:id='l2h-3959' class="function">_structure</tt></b>(</nobr></td>
  <td><var>msg</var><big>[</big><var>, fp</var><big>[</big><var>, level</var><big>]</big><var></var><big>]</big><var></var>)</td></tr></table></dt>
<dd>
Prints an indented representation of the content types of the
message object structure.  For example:

<P>
<div class="verbatim"><pre>
&gt;&gt;&gt; msg = email.message_from_file(somefile)
&gt;&gt;&gt; _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
</pre></div>

<P>
Optional <var>fp</var> is a file-like object to print the output to.  It
must be suitable for Python's extended print statement.  <var>level</var>
is used internally.
</dl>

<P>

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<span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span>
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