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 <section id="module-email.header">
<h1><a class="reference internal" href="#module-email.header" title="email.header: Representing non-ASCII headers"><code class="xref py py-mod docutils literal notranslate">email.header</code></a>: Internationalized headers<a class="headerlink" href="#module-email.header" title="Permalink to this headline">¶</a></h1>
Source code: <a class="reference external" href="https://github.com/python/cpython/tree/3.10/Lib/email/header.py">Lib/email/header.py</a>
<hr class="docutils" />
This module is part of the legacy (<code class="docutils literal notranslate">Compat32</code>) email API. In the current API
encoding and decoding of headers is handled transparently by the
dictionary-like API of the <a class="reference internal" href="email.message.html#email.message.EmailMessage" title="email.message.EmailMessage"><code class="xref py py-class docutils literal notranslate">EmailMessage</code></a> class. In
addition to uses in legacy code, this module can be useful in applications that
need to completely control the character sets used when encoding headers.
The remaining text in this section is the original documentation of the module.
<a class="rfc reference external" href="https://datatracker.ietf.org/doc/html/rfc2822.html">RFC 2822</a> is the base standard that describes the format of email messages.
It derives from the older <a class="rfc reference external" href="https://datatracker.ietf.org/doc/html/rfc822.html">RFC 822</a> standard which came into widespread use at
a time when most email was composed of ASCII characters only. <a class="rfc reference external" href="https://datatracker.ietf.org/doc/html/rfc2822.html">RFC 2822</a> is a
specification written assuming email contains only 7-bit ASCII characters.
Of course, as email has been deployed worldwide, it has become
internationalized, such that language specific character sets can now be used in
email messages. The base standard still requires email messages to be
transferred using only 7-bit ASCII characters, so a slew of RFCs have been
written describing how to encode email containing non-ASCII characters into
<a class="rfc reference external" href="https://datatracker.ietf.org/doc/html/rfc2822.html">RFC 2822</a>-compliant format. These RFCs include <a class="rfc reference external" href="https://datatracker.ietf.org/doc/html/rfc2045.html">RFC 2045</a>, <a class="rfc reference external" href="https://datatracker.ietf.org/doc/html/rfc2046.html">RFC 2046</a>,
<a class="rfc reference external" href="https://datatracker.ietf.org/doc/html/rfc2047.html">RFC 2047</a>, and <a class="rfc reference external" href="https://datatracker.ietf.org/doc/html/rfc2231.html">RFC 2231</a>. 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">email</code></a> package supports these standards
in its <a class="reference internal" href="#module-email.header" title="email.header: Representing non-ASCII headers"><code class="xref py py-mod docutils literal notranslate">email.header</code></a> and <a class="reference internal" href="email.charset.html#module-email.charset" title="email.charset: Character Sets"><code class="xref py py-mod docutils literal notranslate">email.charset</code></a> modules.
If you want to include non-ASCII characters in your email headers, say in the
Subject or To fields, you should use the
<a class="reference internal" href="#email.header.Header" title="email.header.Header"><code class="xref py py-class docutils literal notranslate">Header</code></a> class and assign the field in the <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">Message</code></a>
object to an instance of <a class="reference internal" href="#email.header.Header" title="email.header.Header"><code class="xref py py-class docutils literal notranslate">Header</code></a> instead of using a string for the header
value. Import the <a class="reference internal" href="#email.header.Header" title="email.header.Header"><code class="xref py py-class docutils literal notranslate">Header</code></a> class from the <a class="reference internal" href="#module-email.header" title="email.header: Representing non-ASCII headers"><code class="xref py py-mod docutils literal notranslate">email.header</code></a> module.
For example:
<div class="highlight-python3 notranslate"><div class="highlight"><pre>&gt;&gt;&gt; from email.message import Message
&gt;&gt;&gt; from email.header import Header
&gt;&gt;&gt; msg = Message()
&gt;&gt;&gt; h = Header(&#39;p\xf6stal&#39;, &#39;iso-8859-1&#39;)
&gt;&gt;&gt; msg[&#39;Subject&#39;] = h
&gt;&gt;&gt; msg.as_string()
&#39;Subject: =?iso-8859-1?q?p=F6stal?=\n\n&#39;
</pre></div>
</div>
Notice here how we wanted the Subject field to contain a non-ASCII
character? We did this by creating a <a class="reference internal" href="#email.header.Header" title="email.header.Header"><code class="xref py py-class docutils literal notranslate">Header</code></a> instance and passing in
the character set that the byte string was encoded in. When the subsequent
<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">Message</code></a> instance was flattened, the Subject
field was properly <a class="rfc reference external" href="https://datatracker.ietf.org/doc/html/rfc2047.html">RFC 2047</a> encoded. MIME-aware mail readers would show this
header using the embedded ISO-8859-1 character.
Here is the <a class="reference internal" href="#email.header.Header" title="email.header.Header"><code class="xref py py-class docutils literal notranslate">Header</code></a> class description:
<dl class="py class">
<dt class="sig sig-object py" id="email.header.Header">
class email.header.Header(s=None, charset=None, maxlinelen=None, header_name=None, continuation_ws=' ', errors='strict')<a class="headerlink" href="#email.header.Header" title="Permalink to this definition">¶</a></dt>
<dd>Create a MIME-compliant header that can contain strings in different character
sets.
Optional s is the initial header value. If <code class="docutils literal notranslate">None</code> (the default), the
initial header value is not set. You can later append to the header with
<a class="reference internal" href="#email.header.Header.append" title="email.header.Header.append"><code class="xref py py-meth docutils literal notranslate">append()</code></a> method calls. s may be an instance of <a class="reference internal" href="stdtypes.html#bytes" title="bytes"><code class="xref py py-class docutils literal notranslate">bytes</code></a> or
<a class="reference internal" href="stdtypes.html#str" title="str"><code class="xref py py-class docutils literal notranslate">str</code></a>, but see the <a class="reference internal" href="#email.header.Header.append" title="email.header.Header.append"><code class="xref py py-meth docutils literal notranslate">append()</code></a> documentation for semantics.
Optional charset serves two purposes: it has the same meaning as the charset
argument to the <a class="reference internal" href="#email.header.Header.append" title="email.header.Header.append"><code class="xref py py-meth docutils literal notranslate">append()</code></a> method. It also sets the default character set
for all subsequent <a class="reference internal" href="#email.header.Header.append" title="email.header.Header.append"><code class="xref py py-meth docutils literal notranslate">append()</code></a> calls that omit the charset argument. If
charset is not provided in the constructor (the default), the <code class="docutils literal notranslate">us-ascii</code>
character set is used both as s’s initial charset and as the default for
subsequent <a class="reference internal" href="#email.header.Header.append" title="email.header.Header.append"><code class="xref py py-meth docutils literal notranslate">append()</code></a> calls.
The maximum line length can be specified explicitly via maxlinelen. For
splitting the first line to a shorter value (to account for the field header
which isn’t included in s, e.g. Subject) pass in the name of the
field in header_name. The default maxlinelen is 76, and the default value
for header_name is <code class="docutils literal notranslate">None</code>, meaning it is not taken into account for the
first line of a long, split header.
Optional continuation_ws must be <a class="rfc reference external" href="https://datatracker.ietf.org/doc/html/rfc2822.html">RFC 2822</a>-compliant folding
whitespace, and is usually either a space or a hard tab character. This
character will be prepended to continuation lines. continuation_ws
defaults to a single space character.
Optional errors is passed straight through to the <a class="reference internal" href="#email.header.Header.append" title="email.header.Header.append"><code class="xref py py-meth docutils literal notranslate">append()</code></a> method.
<dl class="py method">
<dt class="sig sig-object py" id="email.header.Header.append">
append(s, charset=None, errors='strict')<a class="headerlink" href="#email.header.Header.append" title="Permalink to this definition">¶</a></dt>
<dd>Append the string s to the MIME header.
Optional charset, if given, should be a <a class="reference internal" href="email.charset.html#email.charset.Charset" title="email.charset.Charset"><code class="xref py py-class docutils literal notranslate">Charset</code></a>
instance (see <a class="reference internal" href="email.charset.html#module-email.charset" title="email.charset: Character Sets"><code class="xref py py-mod docutils literal notranslate">email.charset</code></a>) or the name of a character set, which
will be converted to a <a class="reference internal" href="email.charset.html#email.charset.Charset" title="email.charset.Charset"><code class="xref py py-class docutils literal notranslate">Charset</code></a> instance. A value
of <code class="docutils literal notranslate">None</code> (the default) means that the charset given in the constructor
is used.
s may be an instance of <a class="reference internal" href="stdtypes.html#bytes" title="bytes"><code class="xref py py-class docutils literal notranslate">bytes</code></a> or <a class="reference internal" href="stdtypes.html#str" title="str"><code class="xref py py-class docutils literal notranslate">str</code></a>. If it is an
instance of <a class="reference internal" href="stdtypes.html#bytes" title="bytes"><code class="xref py py-class docutils literal notranslate">bytes</code></a>, then charset is the encoding of that byte
string, and a <a class="reference internal" href="exceptions.html#UnicodeError" title="UnicodeError"><code class="xref py py-exc docutils literal notranslate">UnicodeError</code></a> will be raised if the string cannot be
decoded with that character set.
If s is an instance of <a class="reference internal" href="stdtypes.html#str" title="str"><code class="xref py py-class docutils literal notranslate">str</code></a>, then charset is a hint specifying
the character set of the characters in the string.
In either case, when producing an <a class="rfc reference external" href="https://datatracker.ietf.org/doc/html/rfc2822.html">RFC 2822</a>-compliant header using
<a class="rfc reference external" href="https://datatracker.ietf.org/doc/html/rfc2047.html">RFC 2047</a> rules, the string will be encoded using the output codec of
the charset. If the string cannot be encoded using the output codec, a
UnicodeError will be raised.
Optional errors is passed as the errors argument to the decode call
if s is a byte string.
</dd></dl>

<dl class="py method">
<dt class="sig sig-object py" id="email.header.Header.encode">
encode(splitchars=';, \t', maxlinelen=None, linesep='\n')<a class="headerlink" href="#email.header.Header.encode" title="Permalink to this definition">¶</a></dt>
<dd>Encode a message header into an RFC-compliant format, possibly wrapping
long lines and encapsulating non-ASCII parts in base64 or quoted-printable
encodings.
Optional splitchars is a string containing characters which should be
given extra weight by the splitting algorithm during normal header
wrapping. This is in very rough support of <a class="rfc reference external" href="https://datatracker.ietf.org/doc/html/rfc2822.html">RFC 2822</a>'s ‘higher level
syntactic breaks’: split points preceded by a splitchar are preferred
during line splitting, with the characters preferred in the order in
which they appear in the string. Space and tab may be included in the
string to indicate whether preference should be given to one over the
other as a split point when other split chars do not appear in the line
being split. Splitchars does not affect <a class="rfc reference external" href="https://datatracker.ietf.org/doc/html/rfc2047.html">RFC 2047</a> encoded lines.
maxlinelen, if given, overrides the instance’s value for the maximum
line length.
linesep specifies the characters used to separate the lines of the
folded header. It defaults to the most useful value for Python
application code (<code class="docutils literal notranslate">\n</code>), but <code class="docutils literal notranslate">\r\n</code> can be specified in order
to produce headers with RFC-compliant line separators.
<div class="versionchanged">
Changed in version 3.2: Added the linesep argument.
</div>
</dd></dl>

The <a class="reference internal" href="#email.header.Header" title="email.header.Header"><code class="xref py py-class docutils literal notranslate">Header</code></a> class also provides a number of methods to support
standard operators and built-in functions.
<dl class="py method">
<dt class="sig sig-object py" id="email.header.Header.__str__">
__str__()<a class="headerlink" href="#email.header.Header.__str__" title="Permalink to this definition">¶</a></dt>
<dd>Returns an approximation of the <a class="reference internal" href="#email.header.Header" title="email.header.Header"><code class="xref py py-class docutils literal notranslate">Header</code></a> as a string, using an
unlimited line length. All pieces are converted to unicode using the
specified encoding and joined together appropriately. Any pieces with a
charset of <code class="docutils literal notranslate">'unknown-8bit'</code> are decoded as ASCII using the <code class="docutils literal notranslate">'replace'</code>
error handler.
<div class="versionchanged">
Changed in version 3.2: Added handling for the <code class="docutils literal notranslate">'unknown-8bit'</code> charset.
</div>
</dd></dl>

<dl class="py method">
<dt class="sig sig-object py" id="email.header.Header.__eq__">
__eq__(other)<a class="headerlink" href="#email.header.Header.__eq__" title="Permalink to this definition">¶</a></dt>
<dd>This method allows you to compare two <a class="reference internal" href="#email.header.Header" title="email.header.Header"><code class="xref py py-class docutils literal notranslate">Header</code></a> instances for
equality.
</dd></dl>

<dl class="py method">
<dt class="sig sig-object py" id="email.header.Header.__ne__">
__ne__(other)<a class="headerlink" href="#email.header.Header.__ne__" title="Permalink to this definition">¶</a></dt>
<dd>This method allows you to compare two <a class="reference internal" href="#email.header.Header" title="email.header.Header"><code class="xref py py-class docutils literal notranslate">Header</code></a> instances for
inequality.
</dd></dl>

</dd></dl>

The <a class="reference internal" href="#module-email.header" title="email.header: Representing non-ASCII headers"><code class="xref py py-mod docutils literal notranslate">email.header</code></a> module also provides the following convenient functions.
<dl class="py function">
<dt class="sig sig-object py" id="email.header.decode_header">
email.header.decode_header(header)<a class="headerlink" href="#email.header.decode_header" title="Permalink to this definition">¶</a></dt>
<dd>Decode a message header value without converting the character set. The header
value is in header.
This function returns a list of <code class="docutils literal notranslate">(decoded_string, charset)</code> pairs containing
each of the decoded parts of the header. charset is <code class="docutils literal notranslate">None</code> for non-encoded
parts of the header, otherwise a lower case string containing the name of the
character set specified in the encoded string.
Here’s an example:
<div class="highlight-python3 notranslate"><div class="highlight"><pre>&gt;&gt;&gt; from email.header import decode_header
&gt;&gt;&gt; decode_header(&#39;=?iso-8859-1?q?p=F6stal?=&#39;)
[(b&#39;p\xf6stal&#39;, &#39;iso-8859-1&#39;)]
</pre></div>
</div>
</dd></dl>

<dl class="py function">
<dt class="sig sig-object py" id="email.header.make_header">
email.header.make_header(decoded_seq, maxlinelen=None, header_name=None, continuation_ws=' ')<a class="headerlink" href="#email.header.make_header" title="Permalink to this definition">¶</a></dt>
<dd>Create a <a class="reference internal" href="#email.header.Header" title="email.header.Header"><code class="xref py py-class docutils literal notranslate">Header</code></a> instance from a sequence of pairs as returned by
<a class="reference internal" href="#email.header.decode_header" title="email.header.decode_header"><code class="xref py py-func docutils literal notranslate">decode_header()</code></a>.
<a class="reference internal" href="#email.header.decode_header" title="email.header.decode_header"><code class="xref py py-func docutils literal notranslate">decode_header()</code></a> takes a header value string and returns a sequence of
pairs of the format <code class="docutils literal notranslate">(decoded_string, charset)</code> where charset is the name of
the character set.
This function takes one of those sequence of pairs and returns a
<a class="reference internal" href="#email.header.Header" title="email.header.Header"><code class="xref py py-class docutils literal notranslate">Header</code></a> instance. Optional maxlinelen, header_name, and
continuation_ws are as in the <a class="reference internal" href="#email.header.Header" title="email.header.Header"><code class="xref py py-class docutils literal notranslate">Header</code></a> constructor.
</dd></dl>

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