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<section id="module-email.encoders">
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<span id="email-encoders-encoders"></span><h1><code class="xref py py-mod docutils literal notranslate"><span class="pre">email.encoders</span></code>: Encoders<a class="headerlink" href="#module-email.encoders" title="Link to this heading">¶</a></h1>
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<p><strong>Source code:</strong> <a class="extlink-source reference external" href="https://github.com/python/cpython/tree/3.13/Lib/email/encoders.py">Lib/email/encoders.py</a></p>
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<hr class="docutils" />
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<p>This module is part of the legacy (<code class="docutils literal notranslate"><span class="pre">Compat32</span></code>) email API. In the
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new API the functionality is provided by the <em>cte</em> parameter of
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the <a class="reference internal" href="email.message.html#email.message.EmailMessage.set_content" title="email.message.EmailMessage.set_content"><code class="xref py py-meth docutils literal notranslate"><span class="pre">set_content()</span></code></a> method.</p>
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<p>This module is deprecated in Python 3. The functions provided here
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should not be called explicitly since the <a class="reference internal" href="email.mime.html#email.mime.text.MIMEText" title="email.mime.text.MIMEText"><code class="xref py py-class docutils literal notranslate"><span class="pre">MIMEText</span></code></a>
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class sets the content type and CTE header using the <em>_subtype</em> and <em>_charset</em>
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values passed during the instantiation of that class.</p>
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<p>The remaining text in this section is the original documentation of the module.</p>
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<p>When creating <a class="reference internal" href="email.compat32-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
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||
need to encode the payloads for transport through compliant mail servers. This
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is especially true for <em class="mimetype">image/*</em> and <em class="mimetype">text/*</em> type messages
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containing binary data.</p>
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<p>The <a class="reference internal" href="email.html#module-email" title="email: Package supporting the parsing, manipulating, and generating email messages."><code class="xref py py-mod docutils literal notranslate"><span class="pre">email</span></code></a> package provides some convenient encoders in its
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<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">encoders</span></code></a> module. These encoders are actually used by the
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||
<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>
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class constructors to provide default encodings. All encoder functions take
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exactly one argument, the message object to encode. They usually extract the
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payload, encode it, and reset the payload to this newly encoded value. They
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should also set the <em class="mailheader">Content-Transfer-Encoding</em> header as appropriate.</p>
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<p>Note that these functions are not meaningful for a multipart message. They
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must be applied to individual subparts instead, and will raise a
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<a class="reference internal" href="exceptions.html#TypeError" title="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>
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<p>Here are the encoding functions provided:</p>
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<dl class="py function">
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<dt class="sig sig-object py" id="email.encoders.encode_quopri">
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<span class="sig-prename descclassname"><span class="pre">email.encoders.</span></span><span class="sig-name descname"><span class="pre">encode_quopri</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">msg</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#email.encoders.encode_quopri" title="Link to this definition">¶</a></dt>
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<dd><p>Encodes the payload into quoted-printable form and sets the
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<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 brackets" href="#id2" id="id1" role="doc-noteref"><span class="fn-bracket">[</span>1<span class="fn-bracket">]</span></a>.
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This is a good encoding to use when most of your payload is normal printable
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data, but contains a few unprintable characters.</p>
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</dd></dl>
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<dl class="py function">
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<dt class="sig sig-object py" id="email.encoders.encode_base64">
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<span class="sig-prename descclassname"><span class="pre">email.encoders.</span></span><span class="sig-name descname"><span class="pre">encode_base64</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">msg</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#email.encoders.encode_base64" title="Link to this definition">¶</a></dt>
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<dd><p>Encodes the payload into base64 form and sets the
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<em class="mailheader">Content-Transfer-Encoding</em> header to <code class="docutils literal notranslate"><span class="pre">base64</span></code>. This is a good
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encoding to use when most of your payload is unprintable data since it is a more
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compact form than quoted-printable. The drawback of base64 encoding is that it
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renders the text non-human readable.</p>
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</dd></dl>
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<dl class="py function">
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<dt class="sig sig-object py" id="email.encoders.encode_7or8bit">
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<span class="sig-prename descclassname"><span class="pre">email.encoders.</span></span><span class="sig-name descname"><span class="pre">encode_7or8bit</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">msg</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#email.encoders.encode_7or8bit" title="Link to this definition">¶</a></dt>
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<dd><p>This doesn’t actually modify the message’s payload, but it does set the
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<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
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appropriate, based on the payload data.</p>
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</dd></dl>
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<dl class="py function">
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<dt class="sig sig-object py" id="email.encoders.encode_noop">
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<span class="sig-prename descclassname"><span class="pre">email.encoders.</span></span><span class="sig-name descname"><span class="pre">encode_noop</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">msg</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#email.encoders.encode_noop" title="Link to this definition">¶</a></dt>
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<dd><p>This does nothing; it doesn’t even set the
|
||
<em class="mailheader">Content-Transfer-Encoding</em> header.</p>
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||
</dd></dl>
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<p class="rubric">Footnotes</p>
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<aside class="footnote-list brackets">
|
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<aside class="footnote brackets" id="id2" role="doc-footnote">
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||
<span class="label"><span class="fn-bracket">[</span><a role="doc-backlink" href="#id1">1</a><span class="fn-bracket">]</span></span>
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||
<p>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
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characters in the data.</p>
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<li class="nav-item nav-item-3"><a href="email.html" ><code class="xref py py-mod docutils literal notranslate"><span class="pre">email</span></code> — An email and MIME handling package</a> »</li>
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