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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="X-UA-Compatible" content="IE=Edge" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>19.1.15. email.iterators: Iterators — Python 3.6.7 documentation</title> <link rel="stylesheet" href="../_static/pydoctheme.css" type="text/css" /> <link rel="stylesheet" href="../_static/pygments.css" type="text/css" /> <script type="text/javascript" id="documentation_options" data-url_root="../" src="../_static/documentation_options.js"></script> <script type="text/javascript" src="../_static/jquery.js"></script> <script type="text/javascript" src="../_static/underscore.js"></script> <script type="text/javascript" src="../_static/doctools.js"></script> <script type="text/javascript" src="../_static/sidebar.js"></script> <link rel="search" type="application/opensearchdescription+xml" title="Search within Python 3.6.7 documentation" href="../_static/opensearch.xml"/> <link rel="author" title="About these documents" href="../about.html" /> <link rel="index" title="Index" href="../genindex.html" /> <link rel="search" title="Search" href="../search.html" /> <link rel="copyright" title="Copyright" href="../copyright.html" /> <link rel="next" title="19.2. json — JSON encoder and decoder" href="json.html" /> <link rel="prev" title="19.1.14. email.utils: Miscellaneous utilities" href="email.util.html" /> <link rel="shortcut icon" type="image/png" href="../_static/py.png" /> <link rel="canonical" href="https://docs.python.org/3/library/email.iterators.html" /> <script type="text/javascript" src="../_static/copybutton.js"></script> </head><body> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" accesskey="I">index</a></li> <li class="right" > <a href="../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="json.html" title="19.2. json — JSON encoder and decoder" accesskey="N">next</a> |</li> <li class="right" > <a href="email.util.html" title="19.1.14. email.utils: Miscellaneous utilities" accesskey="P">previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="https://www.python.org/">Python</a> »</li> <li> <a href="../index.html">3.6.7 Documentation</a> » </li> <li class="nav-item nav-item-1"><a href="index.html" >The Python Standard Library</a> »</li> <li class="nav-item nav-item-2"><a href="netdata.html" >19. Internet Data Handling</a> »</li> <li class="nav-item nav-item-3"><a href="email.html" accesskey="U">19.1. <code class="docutils literal notranslate"><span class="pre">email</span></code> — An email and MIME handling package</a> »</li> <li class="right"> <div class="inline-search" style="display: none" role="search"> <form class="inline-search" action="../search.html" method="get"> <input placeholder="Quick search" type="text" name="q" /> <input type="submit" value="Go" /> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form> </div> <script type="text/javascript">$('.inline-search').show(0);</script> | </li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body" role="main"> <div class="section" id="module-email.iterators"> <span id="email-iterators-iterators"></span><h1>19.1.15. <a class="reference internal" href="#module-email.iterators" title="email.iterators: Iterate over a message object tree."><code class="xref py py-mod docutils literal notranslate"><span class="pre">email.iterators</span></code></a>: Iterators<a class="headerlink" href="#module-email.iterators" title="Permalink to this headline">¶</a></h1> <p><strong>Source code:</strong> <a class="reference external" href="https://github.com/python/cpython/tree/3.6/Lib/email/iterators.py">Lib/email/iterators.py</a></p> <hr class="docutils" /> <p>Iterating over a message object tree is fairly easy with the <a class="reference internal" href="email.compat32-message.html#email.message.Message.walk" title="email.message.Message.walk"><code class="xref py py-meth docutils literal notranslate"><span class="pre">Message.walk</span></code></a> method. The <a class="reference internal" href="#module-email.iterators" title="email.iterators: Iterate over a message object tree."><code class="xref py py-mod docutils literal notranslate"><span class="pre">email.iterators</span></code></a> module provides some useful higher level iterations over message object trees.</p> <dl class="function"> <dt id="email.iterators.body_line_iterator"> <code class="descclassname">email.iterators.</code><code class="descname">body_line_iterator</code><span class="sig-paren">(</span><em>msg</em>, <em>decode=False</em><span class="sig-paren">)</span><a class="headerlink" href="#email.iterators.body_line_iterator" title="Permalink to this definition">¶</a></dt> <dd><p>This iterates over all the payloads in all the subparts of <em>msg</em>, 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 <a class="reference internal" href="io.html#io.TextIOBase.readline" title="io.TextIOBase.readline"><code class="xref py py-meth docutils literal notranslate"><span class="pre">readline()</span></code></a>, skipping over all the intervening headers.</p> <p>Optional <em>decode</em> is passed through to <a class="reference internal" href="email.compat32-message.html#email.message.Message.get_payload" title="email.message.Message.get_payload"><code class="xref py py-meth docutils literal notranslate"><span class="pre">Message.get_payload</span></code></a>.</p> </dd></dl> <dl class="function"> <dt id="email.iterators.typed_subpart_iterator"> <code class="descclassname">email.iterators.</code><code class="descname">typed_subpart_iterator</code><span class="sig-paren">(</span><em>msg</em>, <em>maintype='text'</em>, <em>subtype=None</em><span class="sig-paren">)</span><a class="headerlink" href="#email.iterators.typed_subpart_iterator" title="Permalink to this definition">¶</a></dt> <dd><p>This iterates over all the subparts of <em>msg</em>, returning only those subparts that match the MIME type specified by <em>maintype</em> and <em>subtype</em>.</p> <p>Note that <em>subtype</em> is optional; if omitted, then subpart MIME type matching is done only with the main type. <em>maintype</em> is optional too; it defaults to <em class="mimetype">text</em>.</p> <p>Thus, by default <a class="reference internal" href="#email.iterators.typed_subpart_iterator" title="email.iterators.typed_subpart_iterator"><code class="xref py py-func docutils literal notranslate"><span class="pre">typed_subpart_iterator()</span></code></a> returns each subpart that has a MIME type of <em class="mimetype">text/*</em>.</p> </dd></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 class="function"> <dt id="email.iterators._structure"> <code class="descclassname">email.iterators.</code><code class="descname">_structure</code><span class="sig-paren">(</span><em>msg</em>, <em>fp=None</em>, <em>level=0</em>, <em>include_default=False</em><span class="sig-paren">)</span><a class="headerlink" href="#email.iterators._structure" title="Permalink to this definition">¶</a></dt> <dd><p>Prints an indented representation of the content types of the message object structure. For example:</p> <div class="highlight-pycon notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="n">msg</span> <span class="o">=</span> <span class="n">email</span><span class="o">.</span><span class="n">message_from_file</span><span class="p">(</span><span class="n">somefile</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">_structure</span><span class="p">(</span><span class="n">msg</span><span class="p">)</span> <span class="go">multipart/mixed</span> <span class="go"> text/plain</span> <span class="go"> text/plain</span> <span class="go"> multipart/digest</span> <span class="go"> message/rfc822</span> <span class="go"> text/plain</span> <span class="go"> message/rfc822</span> <span class="go"> text/plain</span> <span class="go"> message/rfc822</span> <span class="go"> text/plain</span> <span class="go"> message/rfc822</span> <span class="go"> text/plain</span> <span class="go"> message/rfc822</span> <span class="go"> text/plain</span> <span class="go"> text/plain</span> </pre></div> </div> <p>Optional <em>fp</em> is a file-like object to print the output to. It must be suitable for Python’s <a class="reference internal" href="functions.html#print" title="print"><code class="xref py py-func docutils literal notranslate"><span class="pre">print()</span></code></a> function. <em>level</em> is used internally. <em>include_default</em>, if true, prints the default type as well.</p> </dd></dl> </div> </div> </div> </div> <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> <div class="sphinxsidebarwrapper"> <h4>Previous topic</h4> <p class="topless"><a href="email.util.html" title="previous chapter">19.1.14. <code class="docutils literal notranslate"><span class="pre">email.utils</span></code>: Miscellaneous utilities</a></p> <h4>Next topic</h4> <p class="topless"><a href="json.html" title="next chapter">19.2. <code class="docutils literal notranslate"><span class="pre">json</span></code> — JSON encoder and decoder</a></p> <div role="note" aria-label="source link"> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../bugs.html">Report a Bug</a></li> <li> <a href="https://github.com/python/cpython/blob/3.6/Doc/library/email.iterators.rst" rel="nofollow">Show Source </a> </li> </ul> </div> </div> </div> <div class="clearer"></div> </div> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" >index</a></li> <li class="right" > <a href="../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="json.html" title="19.2. json — JSON encoder and decoder" >next</a> |</li> <li class="right" > <a href="email.util.html" title="19.1.14. email.utils: Miscellaneous utilities" >previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="https://www.python.org/">Python</a> »</li> <li> <a href="../index.html">3.6.7 Documentation</a> » </li> <li class="nav-item nav-item-1"><a href="index.html" >The Python Standard Library</a> »</li> <li class="nav-item nav-item-2"><a href="netdata.html" >19. Internet Data Handling</a> »</li> <li class="nav-item nav-item-3"><a href="email.html" >19.1. <code class="docutils literal notranslate"><span class="pre">email</span></code> — An email and MIME handling package</a> »</li> <li class="right"> <div class="inline-search" style="display: none" role="search"> <form class="inline-search" action="../search.html" method="get"> <input placeholder="Quick search" type="text" name="q" /> <input type="submit" value="Go" /> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form> </div> <script type="text/javascript">$('.inline-search').show(0);</script> | </li> </ul> </div> <div class="footer"> © <a href="../copyright.html">Copyright</a> 2001-2021, Python Software Foundation. <br /> The Python Software Foundation is a non-profit corporation. <a href="https://www.python.org/psf/donations/">Please donate.</a> <br /> Last updated on Aug 25, 2021. <a href="../bugs.html">Found a bug</a>? <br /> Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 1.7.6. </div> </body> </html>