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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>18.1.7. email.encoders: Encoders — Python 2.7.18 documentation</title> <link rel="stylesheet" href="../_static/classic.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/language_data.js"></script> <script type="text/javascript" src="../_static/sidebar.js"></script> <link rel="search" type="application/opensearchdescription+xml" title="Search within Python 2.7.18 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="18.1.8. email.errors: Exception and Defect classes" href="email.errors.html" /> <link rel="prev" title="18.1.6. email.charset: Representing character sets" href="email.charset.html" /> <link rel="shortcut icon" type="image/png" href="../_static/py.png" /> <link rel="canonical" href="file:///usr/share/doc/python2.7/html/library/email.encoders.html" /> <script type="text/javascript" src="../_static/copybutton.js"></script> </head><body> <div id="outdated-warning" style="padding: .5em; text-align: center; background-color: #FFBABA; color: #6A0E0E;"> This document is for an old version of Python that is <a href="https://devguide.python.org/devcycle/#end-of-life-branches">no longer supported</a>. You should install the python3 and python3-doc packages and read the <a href="file:///usr/share/doc/python3-doc/html/library/email.encoders.html"> Python documentation for the Python3 version packaged in this release</a>. </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" 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="email.errors.html" title="18.1.8. email.errors: Exception and Defect classes" accesskey="N">next</a> |</li> <li class="right" > <a href="email.charset.html" title="18.1.6. email.charset: Representing character sets" 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">Python 2.7.18 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" >18. Internet Data Handling</a> »</li> <li class="nav-item nav-item-3"><a href="email.html" accesskey="U">18.1. <code class="docutils literal notranslate"><span class="pre">email</span></code> — An email and MIME handling package</a> »</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body" role="main"> <div class="section" id="module-email.encoders"> <span id="email-encoders-encoders"></span><h1>18.1.7. <a class="reference internal" href="#module-email.encoders" title="email.encoders: Encoders for email message payloads."><code class="xref py py-mod docutils literal notranslate"><span class="pre">email.encoders</span></code></a>: Encoders<a class="headerlink" href="#module-email.encoders" title="Permalink to this headline">¶</a></h1> <p>When creating <a class="reference internal" href="email.message.html#email.message.Message" title="email.message.Message"><code class="xref py py-class docutils literal notranslate"><span class="pre">Message</span></code></a> objects from scratch, you often need to encode the payloads for transport through compliant mail servers. This is especially true for <em class="mimetype">image/*</em> and <em class="mimetype">text/*</em> type messages containing binary data.</p> <p>The <a class="reference internal" href="email.html#module-email" title="email: Package supporting the parsing, manipulating, and generating email messages, including MIME documents."><code class="xref py py-mod docutils literal notranslate"><span class="pre">email</span></code></a> package provides some convenient encodings in its <code class="xref py py-mod docutils literal notranslate"><span class="pre">encoders</span></code> module. These encoders are actually used by the <a class="reference internal" href="email.mime.html#email.mime.audio.MIMEAudio" title="email.mime.audio.MIMEAudio"><code class="xref py py-class docutils literal notranslate"><span class="pre">MIMEAudio</span></code></a> and <a class="reference internal" href="email.mime.html#email.mime.image.MIMEImage" title="email.mime.image.MIMEImage"><code class="xref py py-class docutils literal notranslate"><span class="pre">MIMEImage</span></code></a> class constructors to provide default encodings. All encoder functions take exactly one argument, the message object to encode. They usually extract the payload, encode it, and reset the payload to this newly encoded value. They should also set the <em class="mailheader">Content-Transfer-Encoding</em> header as appropriate.</p> <p>Note that these functions are not meaningful for a multipart message. They must be applied to individual subparts instead, and will raise a <a class="reference internal" href="exceptions.html#exceptions.TypeError" title="exceptions.TypeError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">TypeError</span></code></a> if passed a message whose type is multipart.</p> <p>Here are the encoding functions provided:</p> <dl class="function"> <dt id="email.encoders.encode_quopri"> <code class="descclassname">email.encoders.</code><code class="descname">encode_quopri</code><span class="sig-paren">(</span><em>msg</em><span class="sig-paren">)</span><a class="headerlink" href="#email.encoders.encode_quopri" title="Permalink to this definition">¶</a></dt> <dd><p>Encodes the payload into quoted-printable form and sets the <em class="mailheader">Content-Transfer-Encoding</em> header to <code class="docutils literal notranslate"><span class="pre">quoted-printable</span></code> <a class="footnote-reference" href="#id2" id="id1">[1]</a>. This is a good encoding to use when most of your payload is normal printable data, but contains a few unprintable characters.</p> </dd></dl> <dl class="function"> <dt id="email.encoders.encode_base64"> <code class="descclassname">email.encoders.</code><code class="descname">encode_base64</code><span class="sig-paren">(</span><em>msg</em><span class="sig-paren">)</span><a class="headerlink" href="#email.encoders.encode_base64" title="Permalink to this definition">¶</a></dt> <dd><p>Encodes the payload into base64 form and sets the <em class="mailheader">Content-Transfer-Encoding</em> header to <code class="docutils literal notranslate"><span class="pre">base64</span></code>. This is a good encoding to use when most of your payload is unprintable data since it is a more compact form than quoted-printable. The drawback of base64 encoding is that it renders the text non-human readable.</p> </dd></dl> <dl class="function"> <dt id="email.encoders.encode_7or8bit"> <code class="descclassname">email.encoders.</code><code class="descname">encode_7or8bit</code><span class="sig-paren">(</span><em>msg</em><span class="sig-paren">)</span><a class="headerlink" href="#email.encoders.encode_7or8bit" title="Permalink to this definition">¶</a></dt> <dd><p>This doesn’t actually modify the message’s payload, but it does set the <em class="mailheader">Content-Transfer-Encoding</em> header to either <code class="docutils literal notranslate"><span class="pre">7bit</span></code> or <code class="docutils literal notranslate"><span class="pre">8bit</span></code> as appropriate, based on the payload data.</p> </dd></dl> <dl class="function"> <dt id="email.encoders.encode_noop"> <code class="descclassname">email.encoders.</code><code class="descname">encode_noop</code><span class="sig-paren">(</span><em>msg</em><span class="sig-paren">)</span><a class="headerlink" href="#email.encoders.encode_noop" title="Permalink to this definition">¶</a></dt> <dd><p>This does nothing; it doesn’t even set the <em class="mailheader">Content-Transfer-Encoding</em> header.</p> </dd></dl> <p class="rubric">Footnotes</p> <table class="docutils footnote" frame="void" id="id2" rules="none"> <colgroup><col class="label" /><col /></colgroup> <tbody valign="top"> <tr><td class="label"><a class="fn-backref" href="#id1">[1]</a></td><td>Note that encoding with <a class="reference internal" href="#email.encoders.encode_quopri" title="email.encoders.encode_quopri"><code class="xref py py-meth docutils literal notranslate"><span class="pre">encode_quopri()</span></code></a> also encodes all tabs and space characters in the data.</td></tr> </tbody> </table> </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.charset.html" title="previous chapter">18.1.6. <code class="docutils literal notranslate"><span class="pre">email.charset</span></code>: Representing character sets</a></p> <h4>Next topic</h4> <p class="topless"><a href="email.errors.html" title="next chapter">18.1.8. <code class="docutils literal notranslate"><span class="pre">email.errors</span></code>: Exception and Defect classes</a></p> <div role="note" aria-label="source link"> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../_sources/library/email.encoders.rst.txt" rel="nofollow">Show Source</a></li> </ul> </div> <div id="searchbox" style="display: none" role="search"> <h3>Quick search</h3> <div class="searchformwrapper"> <form class="search" action="../search.html" method="get"> <input 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> </div> <script type="text/javascript">$('#searchbox').show(0);</script> </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="email.errors.html" title="18.1.8. email.errors: Exception and Defect classes" >next</a> |</li> <li class="right" > <a href="email.charset.html" title="18.1.6. email.charset: Representing character sets" >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">Python 2.7.18 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" >18. 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