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  <div class="section" id="module-MimeWriter">
<h1>19.8. <tt class="xref docutils literal"><span class="pre">MimeWriter</span></tt> &#8212; Generic MIME file writer<a class="headerlink" href="#module-MimeWriter" title="Permalink to this headline">¶</a></h1>
<p class="deprecated">
<span class="versionmodified">Deprecated since version 2.3: </span>The <a title="Package supporting the parsing, manipulating, and generating email messages, including MIME documents." class="reference external" href="email.html#module-email"><tt class="xref docutils literal"><span class="pre">email</span></tt></a> package should be used in preference to the <tt class="xref docutils literal"><span class="pre">MimeWriter</span></tt>
module.  This module is present only to maintain backward compatibility.</p>
<p>This module defines the class <a title="MimeWriter.MimeWriter" class="reference internal" href="#MimeWriter.MimeWriter"><tt class="xref docutils literal"><span class="pre">MimeWriter</span></tt></a>.  The <a title="MimeWriter.MimeWriter" class="reference internal" href="#MimeWriter.MimeWriter"><tt class="xref docutils literal"><span class="pre">MimeWriter</span></tt></a>
class implements a basic formatter for creating MIME multi-part files.  It
doesn&#8217;t seek around the output file nor does it use large amounts of buffer
space. You must write the parts out in the order that they should occur in the
final file. <a title="MimeWriter.MimeWriter" class="reference internal" href="#MimeWriter.MimeWriter"><tt class="xref docutils literal"><span class="pre">MimeWriter</span></tt></a> does buffer the headers you add, allowing you
to rearrange their order.</p>
<dl class="class">
<dt id="MimeWriter.MimeWriter">
<em class="property">class </em><tt class="descclassname">MimeWriter.</tt><tt class="descname">MimeWriter</tt><big>(</big><em>fp</em><big>)</big><a class="headerlink" href="#MimeWriter.MimeWriter" title="Permalink to this definition">¶</a></dt>
<dd>Return a new instance of the <a title="MimeWriter.MimeWriter" class="reference internal" href="#MimeWriter.MimeWriter"><tt class="xref docutils literal"><span class="pre">MimeWriter</span></tt></a> class.  The only argument
passed, <em>fp</em>, is a file object to be used for writing. Note that a
<tt class="xref docutils literal"><span class="pre">StringIO</span></tt> object could also be used.</dd></dl>

<div class="section" id="mimewriter-objects">
<span id="id1"></span><h2>19.8.1. MimeWriter Objects<a class="headerlink" href="#mimewriter-objects" title="Permalink to this headline">¶</a></h2>
<p><a title="MimeWriter.MimeWriter" class="reference internal" href="#MimeWriter.MimeWriter"><tt class="xref docutils literal"><span class="pre">MimeWriter</span></tt></a> instances have the following methods:</p>
<dl class="method">
<dt id="MimeWriter.MimeWriter.addheader">
<tt class="descclassname">MimeWriter.</tt><tt class="descname">addheader</tt><big>(</big><em>key</em>, <em>value</em><span class="optional">[</span>, <em>prefix</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#MimeWriter.MimeWriter.addheader" title="Permalink to this definition">¶</a></dt>
<dd>Add a header line to the MIME message. The <em>key</em> is the name of the header,
where the <em>value</em> obviously provides the value of the header. The optional
argument <em>prefix</em> determines where the header  is inserted; <tt class="docutils literal"><span class="pre">0</span></tt> means append
at the end, <tt class="docutils literal"><span class="pre">1</span></tt> is insert at the start. The default is to append.</dd></dl>

<dl class="method">
<dt id="MimeWriter.MimeWriter.flushheaders">
<tt class="descclassname">MimeWriter.</tt><tt class="descname">flushheaders</tt><big>(</big><big>)</big><a class="headerlink" href="#MimeWriter.MimeWriter.flushheaders" title="Permalink to this definition">¶</a></dt>
<dd>Causes all headers accumulated so far to be written out (and forgotten). This is
useful if you don&#8217;t need a body part at all, e.g. for a subpart of type
<em>message/rfc822</em> that&#8217;s (mis)used to store some header-like
information.</dd></dl>

<dl class="method">
<dt id="MimeWriter.MimeWriter.startbody">
<tt class="descclassname">MimeWriter.</tt><tt class="descname">startbody</tt><big>(</big><em>ctype</em><span class="optional">[</span>, <em>plist</em><span class="optional">[</span>, <em>prefix</em><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#MimeWriter.MimeWriter.startbody" title="Permalink to this definition">¶</a></dt>
<dd>Returns a file-like object which can be used to write to the body of the
message.  The content-type is set to the provided <em>ctype</em>, and the optional
parameter <em>plist</em> provides additional parameters for the content-type
declaration. <em>prefix</em> functions as in <a title="MimeWriter.MimeWriter.addheader" class="reference internal" href="#MimeWriter.MimeWriter.addheader"><tt class="xref docutils literal"><span class="pre">addheader()</span></tt></a> except that the default
is to insert at the start.</dd></dl>

<dl class="method">
<dt id="MimeWriter.MimeWriter.startmultipartbody">
<tt class="descclassname">MimeWriter.</tt><tt class="descname">startmultipartbody</tt><big>(</big><em>subtype</em><span class="optional">[</span>, <em>boundary</em><span class="optional">[</span>, <em>plist</em><span class="optional">[</span>, <em>prefix</em><span class="optional">]</span><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#MimeWriter.MimeWriter.startmultipartbody" title="Permalink to this definition">¶</a></dt>
<dd>Returns a file-like object which can be used to write to the body of the
message.  Additionally, this method initializes the multi-part code, where
<em>subtype</em> provides the multipart subtype, <em>boundary</em> may provide a user-defined
boundary specification, and <em>plist</em> provides optional parameters for the
subtype. <em>prefix</em> functions as in <a title="MimeWriter.MimeWriter.startbody" class="reference internal" href="#MimeWriter.MimeWriter.startbody"><tt class="xref docutils literal"><span class="pre">startbody()</span></tt></a>.  Subparts should be created
using <a title="MimeWriter.MimeWriter.nextpart" class="reference internal" href="#MimeWriter.MimeWriter.nextpart"><tt class="xref docutils literal"><span class="pre">nextpart()</span></tt></a>.</dd></dl>

<dl class="method">
<dt id="MimeWriter.MimeWriter.nextpart">
<tt class="descclassname">MimeWriter.</tt><tt class="descname">nextpart</tt><big>(</big><big>)</big><a class="headerlink" href="#MimeWriter.MimeWriter.nextpart" title="Permalink to this definition">¶</a></dt>
<dd>Returns a new instance of <a title="MimeWriter.MimeWriter" class="reference internal" href="#MimeWriter.MimeWriter"><tt class="xref docutils literal"><span class="pre">MimeWriter</span></tt></a> which represents an individual
part in a multipart message.  This may be used to write the  part as well as
used for creating recursively complex multipart messages. The message must first
be initialized with <a title="MimeWriter.MimeWriter.startmultipartbody" class="reference internal" href="#MimeWriter.MimeWriter.startmultipartbody"><tt class="xref docutils literal"><span class="pre">startmultipartbody()</span></tt></a> before using <a title="MimeWriter.MimeWriter.nextpart" class="reference internal" href="#MimeWriter.MimeWriter.nextpart"><tt class="xref docutils literal"><span class="pre">nextpart()</span></tt></a>.</dd></dl>

<dl class="method">
<dt id="MimeWriter.MimeWriter.lastpart">
<tt class="descclassname">MimeWriter.</tt><tt class="descname">lastpart</tt><big>(</big><big>)</big><a class="headerlink" href="#MimeWriter.MimeWriter.lastpart" title="Permalink to this definition">¶</a></dt>
<dd>This is used to designate the last part of a multipart message, and should
<em>always</em> be used when writing multipart messages.</dd></dl>

</div>
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<li><a class="reference external" href="#">19.8. <tt class="docutils literal"><span class="pre">MimeWriter</span></tt> &#8212; Generic MIME file writer</a><ul>
<li><a class="reference external" href="#mimewriter-objects">19.8.1. MimeWriter Objects</a></li>
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