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Internet Data Handling</a> &#187;</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> &#187;</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body" role="main"> <div class="section" id="module-email.charset"> <span id="email-charset-representing-character-sets"></span><h1>18.1.6. <a class="reference internal" href="#module-email.charset" title="email.charset: Character Sets"><code class="xref py py-mod docutils literal notranslate"><span class="pre">email.charset</span></code></a>: Representing character sets<a class="headerlink" href="#module-email.charset" title="Permalink to this headline">¶</a></h1> <p>This module provides a class <a class="reference internal" href="#email.charset.Charset" title="email.charset.Charset"><code class="xref py py-class docutils literal notranslate"><span class="pre">Charset</span></code></a> for representing character sets and character set conversions in email messages, as well as a character set registry and several convenience methods for manipulating this registry. Instances of <a class="reference internal" href="#email.charset.Charset" title="email.charset.Charset"><code class="xref py py-class docutils literal notranslate"><span class="pre">Charset</span></code></a> are used in several other modules within 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.</p> <p>Import this class from the <a class="reference internal" href="#module-email.charset" title="email.charset: Character Sets"><code class="xref py py-mod docutils literal notranslate"><span class="pre">email.charset</span></code></a> module.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 2.2.2.</span></p> </div> <dl class="class"> <dt id="email.charset.Charset"> <em class="property">class </em><code class="descclassname">email.charset.</code><code class="descname">Charset</code><span class="sig-paren">(</span><span class="optional">[</span><em>input_charset</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#email.charset.Charset" title="Permalink to this definition">¶</a></dt> <dd><p>Map character sets to their email properties.</p> <p>This class provides information about the requirements imposed on email for a specific character set. It also provides convenience routines for converting between character sets, given the availability of the applicable codecs. Given a character set, it will do its best to provide information on how to use that character set in an email message in an RFC-compliant way.</p> <p>Certain character sets must be encoded with quoted-printable or base64 when used in email headers or bodies. Certain character sets must be converted outright, and are not allowed in email.</p> <p>Optional <em>input_charset</em> is as described below; it is always coerced to lower case. After being alias normalized it is also used as a lookup into the registry of character sets to find out the header encoding, body encoding, and output conversion codec to be used for the character set. For example, if <em>input_charset</em> is <code class="docutils literal notranslate"><span class="pre">iso-8859-1</span></code>, then headers and bodies will be encoded using quoted-printable and no output conversion codec is necessary. If <em>input_charset</em> is <code class="docutils literal notranslate"><span class="pre">euc-jp</span></code>, then headers will be encoded with base64, bodies will not be encoded, but output text will be converted from the <code class="docutils literal notranslate"><span class="pre">euc-jp</span></code> character set to the <code class="docutils literal notranslate"><span class="pre">iso-2022-jp</span></code> character set.</p> <p><a class="reference internal" href="#email.charset.Charset" title="email.charset.Charset"><code class="xref py py-class docutils literal notranslate"><span class="pre">Charset</span></code></a> instances have the following data attributes:</p> <dl class="attribute"> <dt id="email.charset.Charset.input_charset"> <code class="descname">input_charset</code><a class="headerlink" href="#email.charset.Charset.input_charset" title="Permalink to this definition">¶</a></dt> <dd><p>The initial character set specified. Common aliases are converted to their <em>official</em> email names (e.g. <code class="docutils literal notranslate"><span class="pre">latin_1</span></code> is converted to <code class="docutils literal notranslate"><span class="pre">iso-8859-1</span></code>). Defaults to 7-bit <code class="docutils literal notranslate"><span class="pre">us-ascii</span></code>.</p> </dd></dl> <dl class="attribute"> <dt id="email.charset.Charset.header_encoding"> <code class="descname">header_encoding</code><a class="headerlink" href="#email.charset.Charset.header_encoding" title="Permalink to this definition">¶</a></dt> <dd><p>If the character set must be encoded before it can be used in an email header, this attribute will be set to <code class="docutils literal notranslate"><span class="pre">Charset.QP</span></code> (for quoted-printable), <code class="docutils literal notranslate"><span class="pre">Charset.BASE64</span></code> (for base64 encoding), or <code class="docutils literal notranslate"><span class="pre">Charset.SHORTEST</span></code> for the shortest of QP or BASE64 encoding. Otherwise, it will be <code class="docutils literal notranslate"><span class="pre">None</span></code>.</p> </dd></dl> <dl class="attribute"> <dt id="email.charset.Charset.body_encoding"> <code class="descname">body_encoding</code><a class="headerlink" href="#email.charset.Charset.body_encoding" title="Permalink to this definition">¶</a></dt> <dd><p>Same as <em>header_encoding</em>, but describes the encoding for the mail message’s body, which indeed may be different than the header encoding. <code class="docutils literal notranslate"><span class="pre">Charset.SHORTEST</span></code> is not allowed for <em>body_encoding</em>.</p> </dd></dl> <dl class="attribute"> <dt id="email.charset.Charset.output_charset"> <code class="descname">output_charset</code><a class="headerlink" href="#email.charset.Charset.output_charset" title="Permalink to this definition">¶</a></dt> <dd><p>Some character sets must be converted before they can be used in email headers or bodies. If the <em>input_charset</em> is one of them, this attribute will contain the name of the character set output will be converted to. Otherwise, it will be <code class="docutils literal notranslate"><span class="pre">None</span></code>.</p> </dd></dl> <dl class="attribute"> <dt id="email.charset.Charset.input_codec"> <code class="descname">input_codec</code><a class="headerlink" href="#email.charset.Charset.input_codec" title="Permalink to this definition">¶</a></dt> <dd><p>The name of the Python codec used to convert the <em>input_charset</em> to Unicode. If no conversion codec is necessary, this attribute will be <code class="docutils literal notranslate"><span class="pre">None</span></code>.</p> </dd></dl> <dl class="attribute"> <dt id="email.charset.Charset.output_codec"> <code class="descname">output_codec</code><a class="headerlink" href="#email.charset.Charset.output_codec" title="Permalink to this definition">¶</a></dt> <dd><p>The name of the Python codec used to convert Unicode to the <em>output_charset</em>. If no conversion codec is necessary, this attribute will have the same value as the <em>input_codec</em>.</p> </dd></dl> <p><a class="reference internal" href="#email.charset.Charset" title="email.charset.Charset"><code class="xref py py-class docutils literal notranslate"><span class="pre">Charset</span></code></a> instances also have the following methods:</p> <dl class="method"> <dt id="email.charset.Charset.get_body_encoding"> <code class="descname">get_body_encoding</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#email.charset.Charset.get_body_encoding" title="Permalink to this definition">¶</a></dt> <dd><p>Return the content transfer encoding used for body encoding.</p> <p>This is either the string <code class="docutils literal notranslate"><span class="pre">quoted-printable</span></code> or <code class="docutils literal notranslate"><span class="pre">base64</span></code> depending on the encoding used, or it is a function, in which case you should call the function with a single argument, the Message object being encoded. The function should then set the <em class="mailheader">Content-Transfer-Encoding</em> header itself to whatever is appropriate.</p> <p>Returns the string <code class="docutils literal notranslate"><span class="pre">quoted-printable</span></code> if <em>body_encoding</em> is <code class="docutils literal notranslate"><span class="pre">QP</span></code>, returns the string <code class="docutils literal notranslate"><span class="pre">base64</span></code> if <em>body_encoding</em> is <code class="docutils literal notranslate"><span class="pre">BASE64</span></code>, and returns the string <code class="docutils literal notranslate"><span class="pre">7bit</span></code> otherwise.</p> </dd></dl> <dl class="method"> <dt id="email.charset.Charset.convert"> <code class="descname">convert</code><span class="sig-paren">(</span><em>s</em><span class="sig-paren">)</span><a class="headerlink" href="#email.charset.Charset.convert" title="Permalink to this definition">¶</a></dt> <dd><p>Convert the string <em>s</em> from the <em>input_codec</em> to the <em>output_codec</em>.</p> </dd></dl> <dl class="method"> <dt id="email.charset.Charset.to_splittable"> <code class="descname">to_splittable</code><span class="sig-paren">(</span><em>s</em><span class="sig-paren">)</span><a class="headerlink" href="#email.charset.Charset.to_splittable" title="Permalink to this definition">¶</a></dt> <dd><p>Convert a possibly multibyte string to a safely splittable format. <em>s</em> is the string to split.</p> <p>Uses the <em>input_codec</em> to try and convert the string to Unicode, so it can be safely split on character boundaries (even for multibyte characters).</p> <p>Returns the string as-is if it isn’t known how to convert <em>s</em> to Unicode with the <em>input_charset</em>.</p> <p>Characters that could not be converted to Unicode will be replaced with the Unicode replacement character <code class="docutils literal notranslate"><span class="pre">'U+FFFD'</span></code>.</p> </dd></dl> <dl class="method"> <dt id="email.charset.Charset.from_splittable"> <code class="descname">from_splittable</code><span class="sig-paren">(</span><em>ustr</em><span class="optional">[</span>, <em>to_output</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#email.charset.Charset.from_splittable" title="Permalink to this definition">¶</a></dt> <dd><p>Convert a splittable string back into an encoded string. <em>ustr</em> is a Unicode string to “unsplit”.</p> <p>This method uses the proper codec to try and convert the string from Unicode back into an encoded format. Return the string as-is if it is not Unicode, or if it could not be converted from Unicode.</p> <p>Characters that could not be converted from Unicode will be replaced with an appropriate character (usually <code class="docutils literal notranslate"><span class="pre">'?'</span></code>).</p> <p>If <em>to_output</em> is <code class="docutils literal notranslate"><span class="pre">True</span></code> (the default), uses <em>output_codec</em> to convert to an encoded format. If <em>to_output</em> is <code class="docutils literal notranslate"><span class="pre">False</span></code>, it uses <em>input_codec</em>.</p> </dd></dl> <dl class="method"> <dt id="email.charset.Charset.get_output_charset"> <code class="descname">get_output_charset</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#email.charset.Charset.get_output_charset" title="Permalink to this definition">¶</a></dt> <dd><p>Return the output character set.</p> <p>This is the <em>output_charset</em> attribute if that is not <code class="docutils literal notranslate"><span class="pre">None</span></code>, otherwise it is <em>input_charset</em>.</p> </dd></dl> <dl class="method"> <dt id="email.charset.Charset.encoded_header_len"> <code class="descname">encoded_header_len</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#email.charset.Charset.encoded_header_len" title="Permalink to this definition">¶</a></dt> <dd><p>Return the length of the encoded header string, properly calculating for quoted-printable or base64 encoding.</p> </dd></dl> <dl class="method"> <dt id="email.charset.Charset.header_encode"> <code class="descname">header_encode</code><span class="sig-paren">(</span><em>s</em><span class="optional">[</span>, <em>convert</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#email.charset.Charset.header_encode" title="Permalink to this definition">¶</a></dt> <dd><p>Header-encode the string <em>s</em>.</p> <p>If <em>convert</em> is <code class="docutils literal notranslate"><span class="pre">True</span></code>, the string will be converted from the input charset to the output charset automatically. This is not useful for multibyte character sets, which have line length issues (multibyte characters must be split on a character, not a byte boundary); use the higher-level <a class="reference internal" href="email.header.html#email.header.Header" title="email.header.Header"><code class="xref py py-class docutils literal notranslate"><span class="pre">Header</span></code></a> class to deal with these issues (see <a class="reference internal" href="email.header.html#module-email.header" title="email.header: Representing non-ASCII headers"><code class="xref py py-mod docutils literal notranslate"><span class="pre">email.header</span></code></a>). <em>convert</em> defaults to <code class="docutils literal notranslate"><span class="pre">False</span></code>.</p> <p>The type of encoding (base64 or quoted-printable) will be based on the <em>header_encoding</em> attribute.</p> </dd></dl> <dl class="method"> <dt id="email.charset.Charset.body_encode"> <code class="descname">body_encode</code><span class="sig-paren">(</span><em>s</em><span class="optional">[</span>, <em>convert</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#email.charset.Charset.body_encode" title="Permalink to this definition">¶</a></dt> <dd><p>Body-encode the string <em>s</em>.</p> <p>If <em>convert</em> is <code class="docutils literal notranslate"><span class="pre">True</span></code> (the default), the string will be converted from the input charset to output charset automatically. Unlike <a class="reference internal" href="#email.charset.Charset.header_encode" title="email.charset.Charset.header_encode"><code class="xref py py-meth docutils literal notranslate"><span class="pre">header_encode()</span></code></a>, there are no issues with byte boundaries and multibyte charsets in email bodies, so this is usually pretty safe.</p> <p>The type of encoding (base64 or quoted-printable) will be based on the <em>body_encoding</em> attribute.</p> </dd></dl> <p>The <a class="reference internal" href="#email.charset.Charset" title="email.charset.Charset"><code class="xref py py-class docutils literal notranslate"><span class="pre">Charset</span></code></a> class also provides a number of methods to support standard operations and built-in functions.</p> <dl class="method"> <dt id="email.charset.Charset.__str__"> <code class="descname">__str__</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#email.charset.Charset.__str__" title="Permalink to this definition">¶</a></dt> <dd><p>Returns <em>input_charset</em> as a string coerced to lower case. <a class="reference internal" href="../reference/datamodel.html#object.__repr__" title="object.__repr__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__repr__()</span></code></a> is an alias for <a class="reference internal" href="#email.charset.Charset.__str__" title="email.charset.Charset.__str__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__str__()</span></code></a>.</p> </dd></dl> <dl class="method"> <dt id="email.charset.Charset.__eq__"> <code class="descname">__eq__</code><span class="sig-paren">(</span><em>other</em><span class="sig-paren">)</span><a class="headerlink" href="#email.charset.Charset.__eq__" title="Permalink to this definition">¶</a></dt> <dd><p>This method allows you to compare two <a class="reference internal" href="#email.charset.Charset" title="email.charset.Charset"><code class="xref py py-class docutils literal notranslate"><span class="pre">Charset</span></code></a> instances for equality.</p> </dd></dl> <dl class="method"> <dt id="email.charset.Charset.__ne__"> <code class="descname">__ne__</code><span class="sig-paren">(</span><em>other</em><span class="sig-paren">)</span><a class="headerlink" href="#email.charset.Charset.__ne__" title="Permalink to this definition">¶</a></dt> <dd><p>This method allows you to compare two <a class="reference internal" href="#email.charset.Charset" title="email.charset.Charset"><code class="xref py py-class docutils literal notranslate"><span class="pre">Charset</span></code></a> instances for inequality.</p> </dd></dl> </dd></dl> <p>The <a class="reference internal" href="#module-email.charset" title="email.charset: Character Sets"><code class="xref py py-mod docutils literal notranslate"><span class="pre">email.charset</span></code></a> module also provides the following functions for adding new entries to the global character set, alias, and codec registries:</p> <dl class="function"> <dt id="email.charset.add_charset"> <code class="descclassname">email.charset.</code><code class="descname">add_charset</code><span class="sig-paren">(</span><em>charset</em><span class="optional">[</span>, <em>header_enc</em><span class="optional">[</span>, <em>body_enc</em><span class="optional">[</span>, <em>output_charset</em><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#email.charset.add_charset" title="Permalink to this definition">¶</a></dt> <dd><p>Add character properties to the global registry.</p> <p><em>charset</em> is the input character set, and must be the canonical name of a character set.</p> <p>Optional <em>header_enc</em> and <em>body_enc</em> is either <code class="docutils literal notranslate"><span class="pre">Charset.QP</span></code> for quoted-printable, <code class="docutils literal notranslate"><span class="pre">Charset.BASE64</span></code> for base64 encoding, <code class="docutils literal notranslate"><span class="pre">Charset.SHORTEST</span></code> for the shortest of quoted-printable or base64 encoding, or <code class="docutils literal notranslate"><span class="pre">None</span></code> for no encoding. <code class="docutils literal notranslate"><span class="pre">SHORTEST</span></code> is only valid for <em>header_enc</em>. The default is <code class="docutils literal notranslate"><span class="pre">None</span></code> for no encoding.</p> <p>Optional <em>output_charset</em> is the character set that the output should be in. Conversions will proceed from input charset, to Unicode, to the output charset when the method <a class="reference internal" href="#email.charset.Charset.convert" title="email.charset.Charset.convert"><code class="xref py py-meth docutils literal notranslate"><span class="pre">Charset.convert()</span></code></a> is called. The default is to output in the same character set as the input.</p> <p>Both <em>input_charset</em> and <em>output_charset</em> must have Unicode codec entries in the module’s character set-to-codec mapping; use <a class="reference internal" href="#email.charset.add_codec" title="email.charset.add_codec"><code class="xref py py-func docutils literal notranslate"><span class="pre">add_codec()</span></code></a> to add codecs the module does not know about. See the <a class="reference internal" href="codecs.html#module-codecs" title="codecs: Encode and decode data and streams."><code class="xref py py-mod docutils literal notranslate"><span class="pre">codecs</span></code></a> module’s documentation for more information.</p> <p>The global character set registry is kept in the module global dictionary <code class="docutils literal notranslate"><span class="pre">CHARSETS</span></code>.</p> </dd></dl> <dl class="function"> <dt id="email.charset.add_alias"> <code class="descclassname">email.charset.</code><code class="descname">add_alias</code><span class="sig-paren">(</span><em>alias</em>, <em>canonical</em><span class="sig-paren">)</span><a class="headerlink" href="#email.charset.add_alias" title="Permalink to this definition">¶</a></dt> <dd><p>Add a character set alias. <em>alias</em> is the alias name, e.g. <code class="docutils literal notranslate"><span class="pre">latin-1</span></code>. <em>canonical</em> is the character set’s canonical name, e.g. <code class="docutils literal notranslate"><span class="pre">iso-8859-1</span></code>.</p> <p>The global charset alias registry is kept in the module global dictionary <code class="docutils literal notranslate"><span class="pre">ALIASES</span></code>.</p> </dd></dl> <dl class="function"> <dt id="email.charset.add_codec"> <code class="descclassname">email.charset.</code><code class="descname">add_codec</code><span class="sig-paren">(</span><em>charset</em>, <em>codecname</em><span class="sig-paren">)</span><a class="headerlink" href="#email.charset.add_codec" title="Permalink to this definition">¶</a></dt> <dd><p>Add a codec that map characters in the given character set to and from Unicode.</p> <p><em>charset</em> is the canonical name of a character set. <em>codecname</em> is the name of a Python codec, as appropriate for the second argument to the <a class="reference internal" href="functions.html#unicode" title="unicode"><code class="xref py py-func docutils literal notranslate"><span class="pre">unicode()</span></code></a> built-in, or to the <code class="xref py py-meth docutils literal notranslate"><span class="pre">encode()</span></code> method of a Unicode string.</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.header.html" title="previous chapter">18.1.5. <code class="docutils literal notranslate"><span class="pre">email.header</span></code>: Internationalized headers</a></p> <h4>Next topic</h4> <p class="topless"><a href="email.encoders.html" title="next chapter">18.1.7. <code class="docutils literal notranslate"><span class="pre">email.encoders</span></code>: Encoders</a></p> <div role="note" aria-label="source link"> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../_sources/library/email.charset.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.encoders.html" title="18.1.7. email.encoders: Encoders" >next</a> |</li> <li class="right" > <a href="email.header.html" title="18.1.5. email.header: Internationalized headers" >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> &#187;</li> <li> <a href="../index.html">Python 2.7.16 documentation</a> &#187; </li> <li class="nav-item nav-item-1"><a href="index.html" >The Python Standard Library</a> &#187;</li> <li class="nav-item nav-item-2"><a href="netdata.html" >18. 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