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<div class="section" id="module-email.contentmanager">
<span id="email-contentmanager-managing-mime-content"></span><h1>19.1.6. <a class="reference internal" href="#module-email.contentmanager" title="email.contentmanager: Storing and Retrieving Content from MIME Parts"><code class="xref py py-mod docutils literal"><span class="pre">email.contentmanager</span></code></a>: Managing MIME Content<a class="headerlink" href="#module-email.contentmanager" title="Permalink to this headline">¶</a></h1>
<div class="versionadded">
<p><span class="versionmodified">New in version 3.4: </span>as a <a class="reference internal" href="../glossary.html#term-provisional-package"><span class="xref std std-term">provisional module</span></a>.</p>
</div>
<p><strong>Source code:</strong> <a class="reference external" href="https://hg.python.org/cpython/file/3.5/Lib/email/contentmanager.py">Lib/email/contentmanager.py</a></p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">The contentmanager module has been included in the standard library on a
<a class="reference internal" href="../glossary.html#term-provisional-package"><span class="xref std std-term">provisional basis</span></a>. Backwards incompatible
changes (up to and including removal of the module) may occur if deemed
necessary by the core developers.</p>
</div>
<hr class="docutils" />
<p>The <a class="reference internal" href="email.message.html#module-email.message" title="email.message: The base class representing email messages."><code class="xref py py-mod docutils literal"><span class="pre">message</span></code></a> module provides a class that can represent an
arbitrary email message. That basic message model has a useful and flexible
API, but it provides only a lower-level API for interacting with the generic
parts of a message (the headers, generic header parameters, and the payload,
which may be a list of sub-parts). This module provides classes and tools
that provide an enhanced and extensible API for dealing with various specific
types of content, including the ability to retrieve the content of the message
as a specialized object type rather than as a simple bytes object. The module
automatically takes care of the RFC-specified MIME details (required headers
and parameters, etc.) for the certain common content types content properties,
and support for additional types can be added by an application using the
extension mechanisms.</p>
<p>This module defines the eponymous “Content Manager” classes. The base
<a class="reference internal" href="#email.contentmanager.ContentManager" title="email.contentmanager.ContentManager"><code class="xref py py-class docutils literal"><span class="pre">ContentManager</span></code></a> class defines an API for registering content
management functions which extract data from <code class="docutils literal"><span class="pre">Message</span></code> objects or insert data
and headers into <code class="docutils literal"><span class="pre">Message</span></code> objects, thus providing a way of converting
between <code class="docutils literal"><span class="pre">Message</span></code> objects containing data and other representations of that
data (Python data types, specialized Python objects, external files, etc). The
module also defines one concrete content manager: <a class="reference internal" href="#email.contentmanager.raw_data_manager" title="email.contentmanager.raw_data_manager"><code class="xref py py-data docutils literal"><span class="pre">raw_data_manager</span></code></a>
converts between MIME content types and <code class="docutils literal"><span class="pre">str</span></code> or <code class="docutils literal"><span class="pre">bytes</span></code> data. It also
provides a convenient API for managing the MIME parameters when inserting
content into <code class="docutils literal"><span class="pre">Message</span></code>s. It also handles inserting and extracting
<code class="docutils literal"><span class="pre">Message</span></code> objects when dealing with the <code class="docutils literal"><span class="pre">message/rfc822</span></code> content type.</p>
<p>Another part of the enhanced interface is subclasses of
<a class="reference internal" href="email.message.html#email.message.Message" title="email.message.Message"><code class="xref py py-class docutils literal"><span class="pre">Message</span></code></a> that provide new convenience API functions,
including convenience methods for calling the Content Managers derived from
this module.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">Although <a class="reference internal" href="#email.message.EmailMessage" title="email.message.EmailMessage"><code class="xref py py-class docutils literal"><span class="pre">EmailMessage</span></code></a> and <a class="reference internal" href="#email.message.MIMEPart" title="email.message.MIMEPart"><code class="xref py py-class docutils literal"><span class="pre">MIMEPart</span></code></a> are currently
documented in this module because of the provisional nature of the code, the
implementation lives in the <a class="reference internal" href="email.message.html#module-email.message" title="email.message: The base class representing email messages."><code class="xref py py-mod docutils literal"><span class="pre">email.message</span></code></a> module.</p>
</div>
<dl class="class">
<dt id="email.message.EmailMessage">
<em class="property">class </em><code class="descclassname">email.message.</code><code class="descname">EmailMessage</code><span class="sig-paren">(</span><em>policy=default</em><span class="sig-paren">)</span><a class="headerlink" href="#email.message.EmailMessage" title="Permalink to this definition">¶</a></dt>
<dd><p>If <em>policy</em> is specified (it must be an instance of a <a class="reference internal" href="email.policy.html#module-email.policy" title="email.policy: Controlling the parsing and generating of messages"><code class="xref py py-mod docutils literal"><span class="pre">policy</span></code></a>
class) use the rules it specifies to udpate and serialize the representation
of the message. If <em>policy</em> is not set, use the
<a class="reference internal" href="email.policy.html#email.policy.default" title="email.policy.default"><code class="xref py py-class docutils literal"><span class="pre">default</span></code></a> policy, which follows the rules of the email
RFCs except for line endings (instead of the RFC mandated <code class="docutils literal"><span class="pre">\r\n</span></code>, it uses
the Python standard <code class="docutils literal"><span class="pre">\n</span></code> line endings). For more information see the
<a class="reference internal" href="email.policy.html#module-email.policy" title="email.policy: Controlling the parsing and generating of messages"><code class="xref py py-mod docutils literal"><span class="pre">policy</span></code></a> documentation.</p>
<p>This class is a subclass of <a class="reference internal" href="email.message.html#email.message.Message" title="email.message.Message"><code class="xref py py-class docutils literal"><span class="pre">Message</span></code></a>. It adds
the following methods:</p>
<dl class="method">
<dt id="email.message.EmailMessage.is_attachment">
<code class="descname">is_attachment</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#email.message.EmailMessage.is_attachment" title="Permalink to this definition">¶</a></dt>
<dd><p>Return <code class="docutils literal"><span class="pre">True</span></code> if there is a <em class="mailheader">Content-Disposition</em> header
and its (case insensitive) value is <code class="docutils literal"><span class="pre">attachment</span></code>, <code class="docutils literal"><span class="pre">False</span></code> otherwise.</p>
<div class="versionchanged">
<p><span class="versionmodified">Changed in version 3.4.2: </span>is_attachment is now a method instead of a property, for consistency
with <a class="reference internal" href="email.message.html#email.message.Message.is_multipart" title="email.message.Message.is_multipart"><code class="xref py py-meth docutils literal"><span class="pre">is_multipart()</span></code></a>.</p>
</div>
</dd></dl>
<dl class="method">
<dt id="email.message.EmailMessage.get_body">
<code class="descname">get_body</code><span class="sig-paren">(</span><em>preferencelist=('related'</em>, <em>'html'</em>, <em>'plain')</em><span class="sig-paren">)</span><a class="headerlink" href="#email.message.EmailMessage.get_body" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the MIME part that is the best candidate to be the “body” of the
message.</p>
<p><em>preferencelist</em> must be a sequence of strings from the set <code class="docutils literal"><span class="pre">related</span></code>,
<code class="docutils literal"><span class="pre">html</span></code>, and <code class="docutils literal"><span class="pre">plain</span></code>, and indicates the order of preference for the
content type of the part returned.</p>
<p>Start looking for candidate matches with the object on which the
<code class="docutils literal"><span class="pre">get_body</span></code> method is called.</p>
<p>If <code class="docutils literal"><span class="pre">related</span></code> is not included in <em>preferencelist</em>, consider the root
part (or subpart of the root part) of any related encountered as a
candidate if the (sub-)part matches a preference.</p>
<p>When encountering a <code class="docutils literal"><span class="pre">multipart/related</span></code>, check the <code class="docutils literal"><span class="pre">start</span></code> parameter
and if a part with a matching <em class="mailheader">Content-ID</em> is found, consider
only it when looking for candidate matches. Otherwise consider only the
first (default root) part of the <code class="docutils literal"><span class="pre">multipart/related</span></code>.</p>
<p>If a part has a <em class="mailheader">Content-Disposition</em> header, only consider
the part a candidate match if the value of the header is <code class="docutils literal"><span class="pre">inline</span></code>.</p>
<p>If none of the candidates matches any of the preferences in
<em>preferneclist</em>, return <code class="docutils literal"><span class="pre">None</span></code>.</p>
<p>Notes: (1) For most applications the only <em>preferencelist</em> combinations
that really make sense are <code class="docutils literal"><span class="pre">('plain',)</span></code>, <code class="docutils literal"><span class="pre">('html',</span> <span class="pre">'plain')</span></code>, and the
default, <code class="docutils literal"><span class="pre">('related',</span> <span class="pre">'html',</span> <span class="pre">'plain')</span></code>. (2) Because matching starts
with the object on which <code class="docutils literal"><span class="pre">get_body</span></code> is called, calling <code class="docutils literal"><span class="pre">get_body</span></code> on
a <code class="docutils literal"><span class="pre">multipart/related</span></code> will return the object itself unless
<em>preferencelist</em> has a non-default value. (3) Messages (or message parts)
that do not specify a <em class="mailheader">Content-Type</em> or whose
<em class="mailheader">Content-Type</em> header is invalid will be treated as if they
are of type <code class="docutils literal"><span class="pre">text/plain</span></code>, which may occasionally cause <code class="docutils literal"><span class="pre">get_body</span></code> to
return unexpected results.</p>
</dd></dl>
<dl class="method">
<dt id="email.message.EmailMessage.iter_attachments">
<code class="descname">iter_attachments</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#email.message.EmailMessage.iter_attachments" title="Permalink to this definition">¶</a></dt>
<dd><p>Return an iterator over all of the parts of the message that are not
candidate “body” parts. That is, skip the first occurrence of each of
<code class="docutils literal"><span class="pre">text/plain</span></code>, <code class="docutils literal"><span class="pre">text/html</span></code>, <code class="docutils literal"><span class="pre">multipart/related</span></code>, or
<code class="docutils literal"><span class="pre">multipart/alternative</span></code> (unless they are explicitly marked as
attachments via <em class="mailheader">Content-Disposition: attachment</em>), and
return all remaining parts. When applied directly to a
<code class="docutils literal"><span class="pre">multipart/related</span></code>, return an iterator over the all the related parts
except the root part (ie: the part pointed to by the <code class="docutils literal"><span class="pre">start</span></code> parameter,
or the first part if there is no <code class="docutils literal"><span class="pre">start</span></code> parameter or the <code class="docutils literal"><span class="pre">start</span></code>
parameter doesn’t match the <em class="mailheader">Content-ID</em> of any of the
parts). When applied directly to a <code class="docutils literal"><span class="pre">multipart/alternative</span></code> or a
non-<code class="docutils literal"><span class="pre">multipart</span></code>, return an empty iterator.</p>
</dd></dl>
<dl class="method">
<dt id="email.message.EmailMessage.iter_parts">
<code class="descname">iter_parts</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#email.message.EmailMessage.iter_parts" title="Permalink to this definition">¶</a></dt>
<dd><p>Return an iterator over all of the immediate sub-parts of the message,
which will be empty for a non-<code class="docutils literal"><span class="pre">multipart</span></code>. (See also
<code class="xref py py-meth docutils literal"><span class="pre">walk()</span></code>.)</p>
</dd></dl>
<dl class="method">
<dt id="email.message.EmailMessage.get_content">
<code class="descname">get_content</code><span class="sig-paren">(</span><em>*args</em>, <em>content_manager=None</em>, <em>**kw</em><span class="sig-paren">)</span><a class="headerlink" href="#email.message.EmailMessage.get_content" title="Permalink to this definition">¶</a></dt>
<dd><p>Call the <code class="docutils literal"><span class="pre">get_content</span></code> method of the <em>content_manager</em>, passing self
as the message object, and passing along any other arguments or keywords
as additional arguments. If <em>content_manager</em> is not specified, use
the <code class="docutils literal"><span class="pre">content_manager</span></code> specified by the current <a class="reference internal" href="email.policy.html#module-email.policy" title="email.policy: Controlling the parsing and generating of messages"><code class="xref py py-mod docutils literal"><span class="pre">policy</span></code></a>.</p>
</dd></dl>
<dl class="method">
<dt id="email.message.EmailMessage.set_content">
<code class="descname">set_content</code><span class="sig-paren">(</span><em>*args</em>, <em>content_manager=None</em>, <em>**kw</em><span class="sig-paren">)</span><a class="headerlink" href="#email.message.EmailMessage.set_content" title="Permalink to this definition">¶</a></dt>
<dd><p>Call the <code class="docutils literal"><span class="pre">set_content</span></code> method of the <em>content_manager</em>, passing self
as the message object, and passing along any other arguments or keywords
as additional arguments. If <em>content_manager</em> is not specified, use
the <code class="docutils literal"><span class="pre">content_manager</span></code> specified by the current <a class="reference internal" href="email.policy.html#module-email.policy" title="email.policy: Controlling the parsing and generating of messages"><code class="xref py py-mod docutils literal"><span class="pre">policy</span></code></a>.</p>
</dd></dl>
<dl class="method">
<dt id="email.message.EmailMessage.make_related">
<code class="descname">make_related</code><span class="sig-paren">(</span><em>boundary=None</em><span class="sig-paren">)</span><a class="headerlink" href="#email.message.EmailMessage.make_related" title="Permalink to this definition">¶</a></dt>
<dd><p>Convert a non-<code class="docutils literal"><span class="pre">multipart</span></code> message into a <code class="docutils literal"><span class="pre">multipart/related</span></code> message,
moving any existing <em class="mailheader">Content-</em> headers and payload into a
(new) first part of the <code class="docutils literal"><span class="pre">multipart</span></code>. If <em>boundary</em> is specified, use
it as the boundary string in the multipart, otherwise leave the boundary
to be automatically created when it is needed (for example, when the
message is serialized).</p>
</dd></dl>
<dl class="method">
<dt id="email.message.EmailMessage.make_alternative">
<code class="descname">make_alternative</code><span class="sig-paren">(</span><em>boundary=None</em><span class="sig-paren">)</span><a class="headerlink" href="#email.message.EmailMessage.make_alternative" title="Permalink to this definition">¶</a></dt>
<dd><p>Convert a non-<code class="docutils literal"><span class="pre">multipart</span></code> or a <code class="docutils literal"><span class="pre">multipart/related</span></code> into a
<code class="docutils literal"><span class="pre">multipart/alternative</span></code>, moving any existing <em class="mailheader">Content-</em>
headers and payload into a (new) first part of the <code class="docutils literal"><span class="pre">multipart</span></code>. If
<em>boundary</em> is specified, use it as the boundary string in the multipart,
otherwise leave the boundary to be automatically created when it is
needed (for example, when the message is serialized).</p>
</dd></dl>
<dl class="method">
<dt id="email.message.EmailMessage.make_mixed">
<code class="descname">make_mixed</code><span class="sig-paren">(</span><em>boundary=None</em><span class="sig-paren">)</span><a class="headerlink" href="#email.message.EmailMessage.make_mixed" title="Permalink to this definition">¶</a></dt>
<dd><p>Convert a non-<code class="docutils literal"><span class="pre">multipart</span></code>, a <code class="docutils literal"><span class="pre">multipart/related</span></code>, or a
<code class="docutils literal"><span class="pre">multipart-alternative</span></code> into a <code class="docutils literal"><span class="pre">multipart/mixed</span></code>, moving any existing
<em class="mailheader">Content-</em> headers and payload into a (new) first part of the
<code class="docutils literal"><span class="pre">multipart</span></code>. If <em>boundary</em> is specified, use it as the boundary string
in the multipart, otherwise leave the boundary to be automatically
created when it is needed (for example, when the message is serialized).</p>
</dd></dl>
<dl class="method">
<dt id="email.message.EmailMessage.add_related">
<code class="descname">add_related</code><span class="sig-paren">(</span><em>*args</em>, <em>content_manager=None</em>, <em>**kw</em><span class="sig-paren">)</span><a class="headerlink" href="#email.message.EmailMessage.add_related" title="Permalink to this definition">¶</a></dt>
<dd><p>If the message is a <code class="docutils literal"><span class="pre">multipart/related</span></code>, create a new message
object, pass all of the arguments to its <a class="reference internal" href="#email.message.EmailMessage.set_content" title="email.message.EmailMessage.set_content"><code class="xref py py-meth docutils literal"><span class="pre">set_content()</span></code></a> method,
and <a class="reference internal" href="email.message.html#email.message.Message.attach" title="email.message.Message.attach"><code class="xref py py-meth docutils literal"><span class="pre">attach()</span></code></a> it to the <code class="docutils literal"><span class="pre">multipart</span></code>. If
the message is a non-<code class="docutils literal"><span class="pre">multipart</span></code>, call <a class="reference internal" href="#email.message.EmailMessage.make_related" title="email.message.EmailMessage.make_related"><code class="xref py py-meth docutils literal"><span class="pre">make_related()</span></code></a> and then
proceed as above. If the message is any other type of <code class="docutils literal"><span class="pre">multipart</span></code>,
raise a <a class="reference internal" href="exceptions.html#TypeError" title="TypeError"><code class="xref py py-exc docutils literal"><span class="pre">TypeError</span></code></a>. If <em>content_manager</em> is not specified, use
the <code class="docutils literal"><span class="pre">content_manager</span></code> specified by the current <a class="reference internal" href="email.policy.html#module-email.policy" title="email.policy: Controlling the parsing and generating of messages"><code class="xref py py-mod docutils literal"><span class="pre">policy</span></code></a>.
If the added part has no <em class="mailheader">Content-Disposition</em> header,
add one with the value <code class="docutils literal"><span class="pre">inline</span></code>.</p>
</dd></dl>
<dl class="method">
<dt id="email.message.EmailMessage.add_alternative">
<code class="descname">add_alternative</code><span class="sig-paren">(</span><em>*args</em>, <em>content_manager=None</em>, <em>**kw</em><span class="sig-paren">)</span><a class="headerlink" href="#email.message.EmailMessage.add_alternative" title="Permalink to this definition">¶</a></dt>
<dd><p>If the message is a <code class="docutils literal"><span class="pre">multipart/alternative</span></code>, create a new message
object, pass all of the arguments to its <a class="reference internal" href="#email.message.EmailMessage.set_content" title="email.message.EmailMessage.set_content"><code class="xref py py-meth docutils literal"><span class="pre">set_content()</span></code></a> method, and
<a class="reference internal" href="email.message.html#email.message.Message.attach" title="email.message.Message.attach"><code class="xref py py-meth docutils literal"><span class="pre">attach()</span></code></a> it to the <code class="docutils literal"><span class="pre">multipart</span></code>. If the
message is a non-<code class="docutils literal"><span class="pre">multipart</span></code> or <code class="docutils literal"><span class="pre">multipart/related</span></code>, call
<a class="reference internal" href="#email.message.EmailMessage.make_alternative" title="email.message.EmailMessage.make_alternative"><code class="xref py py-meth docutils literal"><span class="pre">make_alternative()</span></code></a> and then proceed as above. If the message is
any other type of <code class="docutils literal"><span class="pre">multipart</span></code>, raise a <a class="reference internal" href="exceptions.html#TypeError" title="TypeError"><code class="xref py py-exc docutils literal"><span class="pre">TypeError</span></code></a>. If
<em>content_manager</em> is not specified, use the <code class="docutils literal"><span class="pre">content_manager</span></code> specified
by the current <a class="reference internal" href="email.policy.html#module-email.policy" title="email.policy: Controlling the parsing and generating of messages"><code class="xref py py-mod docutils literal"><span class="pre">policy</span></code></a>.</p>
</dd></dl>
<dl class="method">
<dt id="email.message.EmailMessage.add_attachment">
<code class="descname">add_attachment</code><span class="sig-paren">(</span><em>*args</em>, <em>content_manager=None</em>, <em>**kw</em><span class="sig-paren">)</span><a class="headerlink" href="#email.message.EmailMessage.add_attachment" title="Permalink to this definition">¶</a></dt>
<dd><p>If the message is a <code class="docutils literal"><span class="pre">multipart/mixed</span></code>, create a new message object,
pass all of the arguments to its <a class="reference internal" href="#email.message.EmailMessage.set_content" title="email.message.EmailMessage.set_content"><code class="xref py py-meth docutils literal"><span class="pre">set_content()</span></code></a> method, and
<a class="reference internal" href="email.message.html#email.message.Message.attach" title="email.message.Message.attach"><code class="xref py py-meth docutils literal"><span class="pre">attach()</span></code></a> it to the <code class="docutils literal"><span class="pre">multipart</span></code>. If the
message is a non-<code class="docutils literal"><span class="pre">multipart</span></code>, <code class="docutils literal"><span class="pre">multipart/related</span></code>, or
<code class="docutils literal"><span class="pre">multipart/alternative</span></code>, call <a class="reference internal" href="#email.message.EmailMessage.make_mixed" title="email.message.EmailMessage.make_mixed"><code class="xref py py-meth docutils literal"><span class="pre">make_mixed()</span></code></a> and then proceed as
above. If <em>content_manager</em> is not specified, use the <code class="docutils literal"><span class="pre">content_manager</span></code>
specified by the current <a class="reference internal" href="email.policy.html#module-email.policy" title="email.policy: Controlling the parsing and generating of messages"><code class="xref py py-mod docutils literal"><span class="pre">policy</span></code></a>. If the added part
has no <em class="mailheader">Content-Disposition</em> header, add one with the value
<code class="docutils literal"><span class="pre">attachment</span></code>. This method can be used both for explicit attachments
(<em class="mailheader">Content-Disposition: attachment</em> and <code class="docutils literal"><span class="pre">inline</span></code> attachments
(<em class="mailheader">Content-Disposition: inline</em>), by passing appropriate
options to the <code class="docutils literal"><span class="pre">content_manager</span></code>.</p>
</dd></dl>
<dl class="method">
<dt id="email.message.EmailMessage.clear">
<code class="descname">clear</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#email.message.EmailMessage.clear" title="Permalink to this definition">¶</a></dt>
<dd><p>Remove the payload and all of the headers.</p>
</dd></dl>
<dl class="method">
<dt id="email.message.EmailMessage.clear_content">
<code class="descname">clear_content</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#email.message.EmailMessage.clear_content" title="Permalink to this definition">¶</a></dt>
<dd><p>Remove the payload and all of the <code class="xref py py-exc docutils literal"><span class="pre">Content-</span></code> headers, leaving
all other headers intact and in their original order.</p>
</dd></dl>
</dd></dl>
<dl class="class">
<dt id="email.message.MIMEPart">
<em class="property">class </em><code class="descclassname">email.message.</code><code class="descname">MIMEPart</code><span class="sig-paren">(</span><em>policy=default</em><span class="sig-paren">)</span><a class="headerlink" href="#email.message.MIMEPart" title="Permalink to this definition">¶</a></dt>
<dd><p>This class represents a subpart of a MIME message. It is identical to
<a class="reference internal" href="#email.message.EmailMessage" title="email.message.EmailMessage"><code class="xref py py-class docutils literal"><span class="pre">EmailMessage</span></code></a>, except that no <em class="mailheader">MIME-Version</em> headers are
added when <a class="reference internal" href="#email.message.EmailMessage.set_content" title="email.message.EmailMessage.set_content"><code class="xref py py-meth docutils literal"><span class="pre">set_content()</span></code></a> is called, since sub-parts do
not need their own <em class="mailheader">MIME-Version</em> headers.</p>
</dd></dl>
<dl class="class">
<dt id="email.contentmanager.ContentManager">
<em class="property">class </em><code class="descclassname">email.contentmanager.</code><code class="descname">ContentManager</code><a class="headerlink" href="#email.contentmanager.ContentManager" title="Permalink to this definition">¶</a></dt>
<dd><p>Base class for content managers. Provides the standard registry mechanisms
to register converters between MIME content and other representations, as
well as the <code class="docutils literal"><span class="pre">get_content</span></code> and <code class="docutils literal"><span class="pre">set_content</span></code> dispatch methods.</p>
<dl class="method">
<dt id="email.contentmanager.ContentManager.get_content">
<code class="descname">get_content</code><span class="sig-paren">(</span><em>msg</em>, <em>*args</em>, <em>**kw</em><span class="sig-paren">)</span><a class="headerlink" href="#email.contentmanager.ContentManager.get_content" title="Permalink to this definition">¶</a></dt>
<dd><p>Look up a handler function based on the <code class="docutils literal"><span class="pre">mimetype</span></code> of <em>msg</em> (see next
paragraph), call it, passing through all arguments, and return the result
of the call. The expectation is that the handler will extract the
payload from <em>msg</em> and return an object that encodes information about
the extracted data.</p>
<p>To find the handler, look for the following keys in the registry,
stopping with the first one found:</p>
<blockquote>
<div><ul class="simple">
<li>the string representing the full MIME type (<code class="docutils literal"><span class="pre">maintype/subtype</span></code>)</li>
<li>the string representing the <code class="docutils literal"><span class="pre">maintype</span></code></li>
<li>the empty string</li>
</ul>
</div></blockquote>
<p>If none of these keys produce a handler, raise a <a class="reference internal" href="exceptions.html#KeyError" title="KeyError"><code class="xref py py-exc docutils literal"><span class="pre">KeyError</span></code></a> for the
full MIME type.</p>
</dd></dl>
<dl class="method">
<dt id="email.contentmanager.ContentManager.set_content">
<code class="descname">set_content</code><span class="sig-paren">(</span><em>msg</em>, <em>obj</em>, <em>*args</em>, <em>**kw</em><span class="sig-paren">)</span><a class="headerlink" href="#email.contentmanager.ContentManager.set_content" title="Permalink to this definition">¶</a></dt>
<dd><p>If the <code class="docutils literal"><span class="pre">maintype</span></code> is <code class="docutils literal"><span class="pre">multipart</span></code>, raise a <a class="reference internal" href="exceptions.html#TypeError" title="TypeError"><code class="xref py py-exc docutils literal"><span class="pre">TypeError</span></code></a>; otherwise
look up a handler function based on the type of <em>obj</em> (see next
paragraph), call <a class="reference internal" href="#email.message.EmailMessage.clear_content" title="email.message.EmailMessage.clear_content"><code class="xref py py-meth docutils literal"><span class="pre">clear_content()</span></code></a> on the
<em>msg</em>, and call the handler function, passing through all arguments. The
expectation is that the handler will transform and store <em>obj</em> into
<em>msg</em>, possibly making other changes to <em>msg</em> as well, such as adding
various MIME headers to encode information needed to interpret the stored
data.</p>
<p>To find the handler, obtain the type of <em>obj</em> (<code class="docutils literal"><span class="pre">typ</span> <span class="pre">=</span> <span class="pre">type(obj)</span></code>), and
look for the following keys in the registry, stopping with the first one
found:</p>
<blockquote>
<div><ul class="simple">
<li>the type itself (<code class="docutils literal"><span class="pre">typ</span></code>)</li>
<li>the type’s fully qualified name (<code class="docutils literal"><span class="pre">typ.__module__</span> <span class="pre">+</span> <span class="pre">'.'</span> <span class="pre">+</span>
<span class="pre">typ.__qualname__</span></code>).</li>
<li>the type’s qualname (<code class="docutils literal"><span class="pre">typ.__qualname__</span></code>)</li>
<li>the type’s name (<code class="docutils literal"><span class="pre">typ.__name__</span></code>).</li>
</ul>
</div></blockquote>
<p>If none of the above match, repeat all of the checks above for each of
the types in the <a class="reference internal" href="../glossary.html#term-mro"><span class="xref std std-term">MRO</span></a> (<code class="docutils literal"><span class="pre">typ.__mro__</span></code>). Finally, if no other key
yields a handler, check for a handler for the key <code class="docutils literal"><span class="pre">None</span></code>. If there is
no handler for <code class="docutils literal"><span class="pre">None</span></code>, raise a <a class="reference internal" href="exceptions.html#KeyError" title="KeyError"><code class="xref py py-exc docutils literal"><span class="pre">KeyError</span></code></a> for the fully
qualified name of the type.</p>
<p>Also add a <em class="mailheader">MIME-Version</em> header if one is not present (see
also <a class="reference internal" href="#email.message.MIMEPart" title="email.message.MIMEPart"><code class="xref py py-class docutils literal"><span class="pre">MIMEPart</span></code></a>).</p>
</dd></dl>
<dl class="method">
<dt id="email.contentmanager.ContentManager.add_get_handler">
<code class="descname">add_get_handler</code><span class="sig-paren">(</span><em>key</em>, <em>handler</em><span class="sig-paren">)</span><a class="headerlink" href="#email.contentmanager.ContentManager.add_get_handler" title="Permalink to this definition">¶</a></dt>
<dd><p>Record the function <em>handler</em> as the handler for <em>key</em>. For the possible
values of <em>key</em>, see <a class="reference internal" href="#email.contentmanager.get_content" title="email.contentmanager.get_content"><code class="xref py py-meth docutils literal"><span class="pre">get_content()</span></code></a>.</p>
</dd></dl>
<dl class="method">
<dt id="email.contentmanager.ContentManager.add_set_handler">
<code class="descname">add_set_handler</code><span class="sig-paren">(</span><em>typekey</em>, <em>handler</em><span class="sig-paren">)</span><a class="headerlink" href="#email.contentmanager.ContentManager.add_set_handler" title="Permalink to this definition">¶</a></dt>
<dd><p>Record <em>handler</em> as the function to call when an object of a type
matching <em>typekey</em> is passed to <a class="reference internal" href="#email.contentmanager.set_content" title="email.contentmanager.set_content"><code class="xref py py-meth docutils literal"><span class="pre">set_content()</span></code></a>. For the possible
values of <em>typekey</em>, see <a class="reference internal" href="#email.contentmanager.set_content" title="email.contentmanager.set_content"><code class="xref py py-meth docutils literal"><span class="pre">set_content()</span></code></a>.</p>
</dd></dl>
</dd></dl>
<div class="section" id="content-manager-instances">
<h2>19.1.6.1. Content Manager Instances<a class="headerlink" href="#content-manager-instances" title="Permalink to this headline">¶</a></h2>
<p>Currently the email package provides only one concrete content manager,
<a class="reference internal" href="#email.contentmanager.raw_data_manager" title="email.contentmanager.raw_data_manager"><code class="xref py py-data docutils literal"><span class="pre">raw_data_manager</span></code></a>, although more may be added in the future.
<a class="reference internal" href="#email.contentmanager.raw_data_manager" title="email.contentmanager.raw_data_manager"><code class="xref py py-data docutils literal"><span class="pre">raw_data_manager</span></code></a> is the
<a class="reference internal" href="email.policy.html#email.policy.EmailPolicy.content_manager" title="email.policy.EmailPolicy.content_manager"><code class="xref py py-attr docutils literal"><span class="pre">content_manager</span></code></a> provided by
<a class="reference internal" href="email.policy.html#email.policy.EmailPolicy" title="email.policy.EmailPolicy"><code class="xref py py-attr docutils literal"><span class="pre">EmailPolicy</span></code></a> and its derivatives.</p>
<dl class="data">
<dt id="email.contentmanager.raw_data_manager">
<code class="descclassname">email.contentmanager.</code><code class="descname">raw_data_manager</code><a class="headerlink" href="#email.contentmanager.raw_data_manager" title="Permalink to this definition">¶</a></dt>
<dd><p>This content manager provides only a minimum interface beyond that provided
by <a class="reference internal" href="email.message.html#email.message.Message" title="email.message.Message"><code class="xref py py-class docutils literal"><span class="pre">Message</span></code></a> itself: it deals only with text, raw
byte strings, and <a class="reference internal" href="email.message.html#email.message.Message" title="email.message.Message"><code class="xref py py-class docutils literal"><span class="pre">Message</span></code></a> objects. Nevertheless, it
provides significant advantages compared to the base API: <code class="docutils literal"><span class="pre">get_content</span></code> on
a text part will return a unicode string without the application needing to
manually decode it, <code class="docutils literal"><span class="pre">set_content</span></code> provides a rich set of options for
controlling the headers added to a part and controlling the content transfer
encoding, and it enables the use of the various <code class="docutils literal"><span class="pre">add_</span></code> methods, thereby
simplifying the creation of multipart messages.</p>
<dl class="method">
<dt id="email.contentmanager.get_content">
<code class="descclassname">email.contentmanager.</code><code class="descname">get_content</code><span class="sig-paren">(</span><em>msg</em>, <em>errors='replace'</em><span class="sig-paren">)</span><a class="headerlink" href="#email.contentmanager.get_content" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the payload of the part as either a string (for <code class="docutils literal"><span class="pre">text</span></code> parts), an
<a class="reference internal" href="#email.message.EmailMessage" title="email.message.EmailMessage"><code class="xref py py-class docutils literal"><span class="pre">EmailMessage</span></code></a> object (for <code class="docutils literal"><span class="pre">message/rfc822</span></code>
parts), or a <code class="docutils literal"><span class="pre">bytes</span></code> object (for all other non-multipart types). Raise
a <a class="reference internal" href="exceptions.html#KeyError" title="KeyError"><code class="xref py py-exc docutils literal"><span class="pre">KeyError</span></code></a> if called on a <code class="docutils literal"><span class="pre">multipart</span></code>. If the part is a
<code class="docutils literal"><span class="pre">text</span></code> part and <em>errors</em> is specified, use it as the error handler when
decoding the payload to unicode. The default error handler is
<code class="docutils literal"><span class="pre">replace</span></code>.</p>
</dd></dl>
<dl class="method">
<dt id="email.contentmanager.set_content">
<code class="descclassname">email.contentmanager.</code><code class="descname">set_content</code><span class="sig-paren">(</span><em>msg</em>, <em><'str'></em>, <em>subtype="plain"</em>, <em>charset='utf-8' cte=None</em>, <em>disposition=None</em>, <em>filename=None</em>, <em>cid=None</em>, <em>params=None</em>, <em>headers=None</em><span class="sig-paren">)</span><a class="headerlink" href="#email.contentmanager.set_content" title="Permalink to this definition">¶</a></dt>
<dt>
<code class="descclassname">email.contentmanager.</code><code class="descname">set_content</code><span class="sig-paren">(</span><em>msg</em>, <em><'bytes'></em>, <em>maintype</em>, <em>subtype</em>, <em>cte="base64"</em>, <em>disposition=None</em>, <em>filename=None</em>, <em>cid=None</em>, <em>params=None</em>, <em>headers=None</em><span class="sig-paren">)</span></dt>
<dt>
<code class="descclassname">email.contentmanager.</code><code class="descname">set_content</code><span class="sig-paren">(</span><em>msg</em>, <em><'Message'></em>, <em>cte=None</em>, <em>disposition=None</em>, <em>filename=None</em>, <em>cid=None</em>, <em>params=None</em>, <em>headers=None</em><span class="sig-paren">)</span></dt>
<dt>
<code class="descclassname">email.contentmanager.</code><code class="descname">set_content</code><span class="sig-paren">(</span><em>msg</em>, <em><'list'></em>, <em>subtype='mixed'</em>, <em>disposition=None</em>, <em>filename=None</em>, <em>cid=None</em>, <em>params=None</em>, <em>headers=None</em><span class="sig-paren">)</span></dt>
<dd><p>Add headers and payload to <em>msg</em>:</p>
<p>Add a <em class="mailheader">Content-Type</em> header with a <code class="docutils literal"><span class="pre">maintype/subtype</span></code>
value.</p>
<blockquote>
<div><ul class="simple">
<li>For <code class="docutils literal"><span class="pre">str</span></code>, set the MIME <code class="docutils literal"><span class="pre">maintype</span></code> to <code class="docutils literal"><span class="pre">text</span></code>, and set the
subtype to <em>subtype</em> if it is specified, or <code class="docutils literal"><span class="pre">plain</span></code> if it is not.</li>
<li>For <code class="docutils literal"><span class="pre">bytes</span></code>, use the specified <em>maintype</em> and <em>subtype</em>, or
raise a <a class="reference internal" href="exceptions.html#TypeError" title="TypeError"><code class="xref py py-exc docutils literal"><span class="pre">TypeError</span></code></a> if they are not specified.</li>
<li>For <a class="reference internal" href="email.message.html#email.message.Message" title="email.message.Message"><code class="xref py py-class docutils literal"><span class="pre">Message</span></code></a> objects, set the maintype to
<code class="docutils literal"><span class="pre">message</span></code>, and set the subtype to <em>subtype</em> if it is specified
or <code class="docutils literal"><span class="pre">rfc822</span></code> if it is not. If <em>subtype</em> is <code class="docutils literal"><span class="pre">partial</span></code>, raise an
error (<code class="docutils literal"><span class="pre">bytes</span></code> objects must be used to construct
<code class="docutils literal"><span class="pre">message/partial</span></code> parts).</li>
<li>For <em><’list’></em>, which should be a list of
<a class="reference internal" href="email.message.html#email.message.Message" title="email.message.Message"><code class="xref py py-class docutils literal"><span class="pre">Message</span></code></a> objects, set the <code class="docutils literal"><span class="pre">maintype</span></code> to
<code class="docutils literal"><span class="pre">multipart</span></code>, and the <code class="docutils literal"><span class="pre">subtype</span></code> to <em>subtype</em> if it is
specified, and <code class="docutils literal"><span class="pre">mixed</span></code> if it is not. If the message parts in
the <em><’list’></em> have <em class="mailheader">MIME-Version</em> headers, remove
them.</li>
</ul>
</div></blockquote>
<p>If <em>charset</em> is provided (which is valid only for <code class="docutils literal"><span class="pre">str</span></code>), encode the
string to bytes using the specified character set. The default is
<code class="docutils literal"><span class="pre">utf-8</span></code>. If the specified <em>charset</em> is a known alias for a standard
MIME charset name, use the standard charset instead.</p>
<p>If <em>cte</em> is set, encode the payload using the specified content transfer
encoding, and set the <em class="mailheader">Content-Transfer-Endcoding</em> header to
that value. For <code class="docutils literal"><span class="pre">str</span></code> objects, if it is not set use heuristics to
determine the most compact encoding. Possible values for <em>cte</em> are
<code class="docutils literal"><span class="pre">quoted-printable</span></code>, <code class="docutils literal"><span class="pre">base64</span></code>, <code class="docutils literal"><span class="pre">7bit</span></code>, <code class="docutils literal"><span class="pre">8bit</span></code>, and <code class="docutils literal"><span class="pre">binary</span></code>.
If the input cannot be encoded in the specified encoding (eg: <code class="docutils literal"><span class="pre">7bit</span></code>),
raise a <a class="reference internal" href="exceptions.html#ValueError" title="ValueError"><code class="xref py py-exc docutils literal"><span class="pre">ValueError</span></code></a>. For <a class="reference internal" href="email.message.html#email.message.Message" title="email.message.Message"><code class="xref py py-class docutils literal"><span class="pre">Message</span></code></a>, per
<span class="target" id="index-0"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc2046.html"><strong>RFC 2046</strong></a>, raise an error if a <em>cte</em> of <code class="docutils literal"><span class="pre">quoted-printable</span></code> or
<code class="docutils literal"><span class="pre">base64</span></code> is requested for <em>subtype</em> <code class="docutils literal"><span class="pre">rfc822</span></code>, and for any <em>cte</em>
other than <code class="docutils literal"><span class="pre">7bit</span></code> for <em>subtype</em> <code class="docutils literal"><span class="pre">external-body</span></code>. For
<code class="docutils literal"><span class="pre">message/rfc822</span></code>, use <code class="docutils literal"><span class="pre">8bit</span></code> if <em>cte</em> is not specified. For all
other values of <em>subtype</em>, use <code class="docutils literal"><span class="pre">7bit</span></code>.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">A <em>cte</em> of <code class="docutils literal"><span class="pre">binary</span></code> does not actually work correctly yet.
The <code class="docutils literal"><span class="pre">Message</span></code> object as modified by <code class="docutils literal"><span class="pre">set_content</span></code> is correct, but
<a class="reference internal" href="email.generator.html#email.generator.BytesGenerator" title="email.generator.BytesGenerator"><code class="xref py py-class docutils literal"><span class="pre">BytesGenerator</span></code></a> does not serialize it
correctly.</p>
</div>
<p>If <em>disposition</em> is set, use it as the value of the
<em class="mailheader">Content-Disposition</em> header. If not specified, and
<em>filename</em> is specified, add the header with the value <code class="docutils literal"><span class="pre">attachment</span></code>.
If it is not specified and <em>filename</em> is also not specified, do not add
the header. The only valid values for <em>disposition</em> are <code class="docutils literal"><span class="pre">attachment</span></code>
and <code class="docutils literal"><span class="pre">inline</span></code>.</p>
<p>If <em>filename</em> is specified, use it as the value of the <code class="docutils literal"><span class="pre">filename</span></code>
parameter of the <em class="mailheader">Content-Disposition</em> header. There is no
default.</p>
<p>If <em>cid</em> is specified, add a <em class="mailheader">Content-ID</em> header with
<em>cid</em> as its value.</p>
<p>If <em>params</em> is specified, iterate its <code class="docutils literal"><span class="pre">items</span></code> method and use the
resulting <code class="docutils literal"><span class="pre">(key,</span> <span class="pre">value)</span></code> pairs to set additional parameters on the
<em class="mailheader">Content-Type</em> header.</p>
<p>If <em>headers</em> is specified and is a list of strings of the form
<code class="docutils literal"><span class="pre">headername:</span> <span class="pre">headervalue</span></code> or a list of <code class="docutils literal"><span class="pre">header</span></code> objects
(distinguished from strings by having a <code class="docutils literal"><span class="pre">name</span></code> attribute), add the
headers to <em>msg</em>.</p>
</dd></dl>
</dd></dl>
</div>
</div>
</div>
</div>
</div>
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<h3><a href="../contents.html">Table Of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">19.1.6. <code class="docutils literal"><span class="pre">email.contentmanager</span></code>: Managing MIME Content</a><ul>
<li><a class="reference internal" href="#content-manager-instances">19.1.6.1. Content Manager Instances</a></li>
</ul>
</li>
</ul>
<h4>Previous topic</h4>
<p class="topless"><a href="email.headerregistry.html"
title="previous chapter">19.1.5. <code class="docutils literal"><span class="pre">email.headerregistry</span></code>: Custom Header Objects</a></p>
<h4>Next topic</h4>
<p class="topless"><a href="email.mime.html"
title="next chapter">19.1.7. <code class="docutils literal"><span class="pre">email.mime</span></code>: Creating email and MIME objects from scratch</a></p>
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