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<div class="section" id="module-email.errors">
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<span id="email-errors-exception-and-defect-classes"></span><h1><a class="reference internal" href="#module-email.errors" title="email.errors: The exception classes used by the email package."><code class="xref py py-mod docutils literal notranslate"><span class="pre">email.errors</span></code></a>: Exception and Defect classes<a class="headerlink" href="#module-email.errors" title="Permalink to this headline">¶</a></h1>
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<p><strong>Source code:</strong> <a class="reference external" href="https://github.com/python/cpython/tree/3.7/Lib/email/errors.py">Lib/email/errors.py</a></p>
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<p>The following exception classes are defined in the <a class="reference internal" href="#module-email.errors" title="email.errors: The exception classes used by the email package."><code class="xref py py-mod docutils literal notranslate"><span class="pre">email.errors</span></code></a> module:</p>
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<dl class="exception">
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<dt id="email.errors.MessageError">
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<em class="property">exception </em><code class="descclassname">email.errors.</code><code class="descname">MessageError</code><a class="headerlink" href="#email.errors.MessageError" title="Permalink to this definition">¶</a></dt>
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<dd><p>This is the base class for all exceptions that the <a class="reference internal" href="email.html#module-email" title="email: Package supporting the parsing, manipulating, and generating email messages."><code class="xref py py-mod docutils literal notranslate"><span class="pre">email</span></code></a> package can
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raise. It is derived from the standard <a class="reference internal" href="exceptions.html#Exception" title="Exception"><code class="xref py py-exc docutils literal notranslate"><span class="pre">Exception</span></code></a> class and defines no
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additional methods.</p>
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</dd></dl>
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<dl class="exception">
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<dt id="email.errors.MessageParseError">
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<em class="property">exception </em><code class="descclassname">email.errors.</code><code class="descname">MessageParseError</code><a class="headerlink" href="#email.errors.MessageParseError" title="Permalink to this definition">¶</a></dt>
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<dd><p>This is the base class for exceptions raised by the
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<a class="reference internal" href="email.parser.html#email.parser.Parser" title="email.parser.Parser"><code class="xref py py-class docutils literal notranslate"><span class="pre">Parser</span></code></a> class. It is derived from
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<a class="reference internal" href="#email.errors.MessageError" title="email.errors.MessageError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">MessageError</span></code></a>. This class is also used internally by the parser used
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by <a class="reference internal" href="email.headerregistry.html#module-email.headerregistry" title="email.headerregistry: Automatic Parsing of headers based on the field name"><code class="xref py py-mod docutils literal notranslate"><span class="pre">headerregistry</span></code></a>.</p>
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</dd></dl>
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<dl class="exception">
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<dt id="email.errors.HeaderParseError">
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<em class="property">exception </em><code class="descclassname">email.errors.</code><code class="descname">HeaderParseError</code><a class="headerlink" href="#email.errors.HeaderParseError" title="Permalink to this definition">¶</a></dt>
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<dd><p>Raised under some error conditions when parsing the <span class="target" id="index-0"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc5322.html"><strong>RFC 5322</strong></a> headers of a
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message, this class is derived from <a class="reference internal" href="#email.errors.MessageParseError" title="email.errors.MessageParseError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">MessageParseError</span></code></a>. The
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<a class="reference internal" href="email.message.html#email.message.EmailMessage.set_boundary" title="email.message.EmailMessage.set_boundary"><code class="xref py py-meth docutils literal notranslate"><span class="pre">set_boundary()</span></code></a> method will raise this
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error if the content type is unknown when the method is called.
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<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> may raise this error for certain base64
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decoding errors, and when an attempt is made to create a header that appears
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to contain an embedded header (that is, there is what is supposed to be a
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continuation line that has no leading whitespace and looks like a header).</p>
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</dd></dl>
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<dl class="exception">
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<dt id="email.errors.BoundaryError">
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<em class="property">exception </em><code class="descclassname">email.errors.</code><code class="descname">BoundaryError</code><a class="headerlink" href="#email.errors.BoundaryError" title="Permalink to this definition">¶</a></dt>
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<dd><p>Deprecated and no longer used.</p>
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</dd></dl>
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<dl class="exception">
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<dt id="email.errors.MultipartConversionError">
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<em class="property">exception </em><code class="descclassname">email.errors.</code><code class="descname">MultipartConversionError</code><a class="headerlink" href="#email.errors.MultipartConversionError" title="Permalink to this definition">¶</a></dt>
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<dd><p>Raised when a payload is added to a <a class="reference internal" href="email.compat32-message.html#email.message.Message" title="email.message.Message"><code class="xref py py-class docutils literal notranslate"><span class="pre">Message</span></code></a> object
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using <code class="xref py py-meth docutils literal notranslate"><span class="pre">add_payload()</span></code>, but the payload is already a scalar and the
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message’s <em class="mailheader">Content-Type</em> main type is not either
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<em class="mimetype">multipart</em> or missing. <a class="reference internal" href="#email.errors.MultipartConversionError" title="email.errors.MultipartConversionError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">MultipartConversionError</span></code></a> multiply
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inherits from <a class="reference internal" href="#email.errors.MessageError" title="email.errors.MessageError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">MessageError</span></code></a> and the built-in <a class="reference internal" href="exceptions.html#TypeError" title="TypeError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">TypeError</span></code></a>.</p>
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<p>Since <code class="xref py py-meth docutils literal notranslate"><span class="pre">Message.add_payload()</span></code> is deprecated, this exception is rarely
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raised in practice. However the exception may also be raised if the
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<a class="reference internal" href="email.compat32-message.html#email.message.Message.attach" title="email.message.Message.attach"><code class="xref py py-meth docutils literal notranslate"><span class="pre">attach()</span></code></a>
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method is called on an instance of a class derived from
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<a class="reference internal" href="email.mime.html#email.mime.nonmultipart.MIMENonMultipart" title="email.mime.nonmultipart.MIMENonMultipart"><code class="xref py py-class docutils literal notranslate"><span class="pre">MIMENonMultipart</span></code></a> (e.g.
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<a class="reference internal" href="email.mime.html#email.mime.image.MIMEImage" title="email.mime.image.MIMEImage"><code class="xref py py-class docutils literal notranslate"><span class="pre">MIMEImage</span></code></a>).</p>
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</dd></dl>
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<p>Here is the list of the defects that the <a class="reference internal" href="email.parser.html#email.parser.FeedParser" title="email.parser.FeedParser"><code class="xref py py-class docutils literal notranslate"><span class="pre">FeedParser</span></code></a>
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can find while parsing messages. Note that the defects are added to the message
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where the problem was found, so for example, if a message nested inside a
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<em class="mimetype">multipart/alternative</em> had a malformed header, that nested message
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object would have a defect, but the containing messages would not.</p>
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<p>All defect classes are subclassed from <code class="xref py py-class docutils literal notranslate"><span class="pre">email.errors.MessageDefect</span></code>.</p>
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<ul>
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<li><p><code class="xref py py-class docutils literal notranslate"><span class="pre">NoBoundaryInMultipartDefect</span></code> – A message claimed to be a multipart,
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but had no <em class="mimetype">boundary</em> parameter.</p></li>
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<li><p><code class="xref py py-class docutils literal notranslate"><span class="pre">StartBoundaryNotFoundDefect</span></code> – The start boundary claimed in the
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<em class="mailheader">Content-Type</em> header was never found.</p></li>
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<li><p><code class="xref py py-class docutils literal notranslate"><span class="pre">CloseBoundaryNotFoundDefect</span></code> – A start boundary was found, but
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no corresponding close boundary was ever found.</p>
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<div class="versionadded">
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<p><span class="versionmodified added">New in version 3.3.</span></p>
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</div>
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</li>
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<li><p><code class="xref py py-class docutils literal notranslate"><span class="pre">FirstHeaderLineIsContinuationDefect</span></code> – The message had a continuation
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line as its first header line.</p></li>
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<li><p><code class="xref py py-class docutils literal notranslate"><span class="pre">MisplacedEnvelopeHeaderDefect</span></code> - A “Unix From” header was found in the
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middle of a header block.</p></li>
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<li><p><code class="xref py py-class docutils literal notranslate"><span class="pre">MissingHeaderBodySeparatorDefect</span></code> - A line was found while parsing
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headers that had no leading white space but contained no ‘:’. Parsing
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continues assuming that the line represents the first line of the body.</p>
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<div class="versionadded">
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<p><span class="versionmodified added">New in version 3.3.</span></p>
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</div>
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</li>
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<li><p><code class="xref py py-class docutils literal notranslate"><span class="pre">MalformedHeaderDefect</span></code> – A header was found that was missing a colon,
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or was otherwise malformed.</p>
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<div class="deprecated">
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<p><span class="versionmodified deprecated">Deprecated since version 3.3: </span>This defect has not been used for several Python versions.</p>
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</div>
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</li>
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<li><p><code class="xref py py-class docutils literal notranslate"><span class="pre">MultipartInvariantViolationDefect</span></code> – A message claimed to be a
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<em class="mimetype">multipart</em>, but no subparts were found. Note that when a message
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has this defect, its <a class="reference internal" href="email.compat32-message.html#email.message.Message.is_multipart" title="email.message.Message.is_multipart"><code class="xref py py-meth docutils literal notranslate"><span class="pre">is_multipart()</span></code></a> method may
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return false even though its content type claims to be <em class="mimetype">multipart</em>.</p></li>
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<li><p><code class="xref py py-class docutils literal notranslate"><span class="pre">InvalidBase64PaddingDefect</span></code> – When decoding a block of base64
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encoded bytes, the padding was not correct. Enough padding is added to
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perform the decode, but the resulting decoded bytes may be invalid.</p></li>
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<li><p><code class="xref py py-class docutils literal notranslate"><span class="pre">InvalidBase64CharactersDefect</span></code> – When decoding a block of base64
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encoded bytes, characters outside the base64 alphabet were encountered.
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The characters are ignored, but the resulting decoded bytes may be invalid.</p></li>
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<li><p><code class="xref py py-class docutils literal notranslate"><span class="pre">InvalidBase64LengthDefect</span></code> – When decoding a block of base64 encoded
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bytes, the number of non-padding base64 characters was invalid (1 more than
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a multiple of 4). The encoded block was kept as-is.</p></li>
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</ul>
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</div>
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<h4>Previous topic</h4>
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<p class="topless"><a href="email.policy.html"
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title="previous chapter"><code class="xref py py-mod docutils literal notranslate"><span class="pre">email.policy</span></code>: Policy Objects</a></p>
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<h4>Next topic</h4>
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<p class="topless"><a href="email.headerregistry.html"
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title="next chapter"><code class="xref py py-mod docutils literal notranslate"><span class="pre">email.headerregistry</span></code>: Custom Header Objects</a></p>
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<h3>This Page</h3>
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Last updated on Jul 13, 2019.
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