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id="cpython-language-and-version">172 <a href="../index.html">3.15.0a6 Documentation</a> »173 </li>174 175 <li class="nav-item nav-item-1"><a href="index.html" >The Python Standard Library</a> »</li>176 <li class="nav-item nav-item-2"><a href="netdata.html" >Internet Data Handling</a> »</li>177 <li class="nav-item nav-item-3"><a href="email.html" accesskey="U"><code class="xref py py-mod docutils literal notranslate"><span class="pre">email</span></code> — An email and MIME handling package</a> »</li>178 <li class="nav-item nav-item-this"><a href=""><code class="xref py py-mod docutils literal notranslate"><span class="pre">email.errors</span></code>: Exception and Defect classes</a></li>179 <li class="right">180 181 182 <div class="inline-search" role="search">183 <form class="inline-search" action="../search.html" method="get">184 <input placeholder="Quick search" aria-label="Quick search" type="search" name="q" id="search-box">185 <input type="submit" value="Go">186 </form>187 </div>188 |189 </li>190 <li class="right">191<label class="theme-selector-label">192 Theme193 <select class="theme-selector" oninput="activateTheme(this.value)">194 <option value="auto" selected>Auto</option>195 <option value="light">Light</option>196 <option value="dark">Dark</option>197 </select>198</label> |</li>199 200 </ul>201 </div> 202 203 <div class="document">204 <div class="documentwrapper">205 <div class="bodywrapper">206 <div class="body" role="main">207 208 <section id="module-email.errors">209<span id="email-errors-exception-and-defect-classes"></span><h1><code class="xref py py-mod docutils literal notranslate"><span class="pre">email.errors</span></code>: Exception and Defect classes<a class="headerlink" href="#module-email.errors" title="Link to this heading">¶</a></h1>210<p><strong>Source code:</strong> <a class="extlink-source reference external" href="https://github.com/python/cpython/tree/main/Lib/email/errors.py">Lib/email/errors.py</a></p>211<hr class="docutils" />212<p>The following exception classes are defined in the <code class="xref py py-mod docutils literal notranslate"><span class="pre">email.errors</span></code> module:</p>213<dl class="py exception">214<dt class="sig sig-object py" id="email.errors.MessageError">215<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">MessageError</span></span><a class="headerlink" href="#email.errors.MessageError" title="Link to this definition">¶</a></dt>216<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 can217raise. 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 no218additional methods.</p>219</dd></dl>220 221<dl class="py exception">222<dt class="sig sig-object py" id="email.errors.MessageParseError">223<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">MessageParseError</span></span><a class="headerlink" href="#email.errors.MessageParseError" title="Link to this definition">¶</a></dt>224<dd><p>This is the base class for exceptions raised by the225<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 from226<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 used227by <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>228</dd></dl>229 230<dl class="py exception">231<dt class="sig sig-object py" id="email.errors.HeaderParseError">232<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">HeaderParseError</span></span><a class="headerlink" href="#email.errors.HeaderParseError" title="Link to this definition">¶</a></dt>233<dd><p>Raised under some error conditions when parsing the <span class="target" id="index-0"></span><a class="rfc reference external" href="https://datatracker.ietf.org/doc/html/rfc5322.html"><strong>RFC 5322</strong></a> headers of a234message, 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>. The235<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 this236error if the content type is unknown when the method is called.237<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 base64238decoding errors, and when an attempt is made to create a header that appears239to contain an embedded header (that is, there is what is supposed to be a240continuation line that has no leading whitespace and looks like a header).</p>241</dd></dl>242 243<dl class="py exception">244<dt class="sig sig-object py" id="email.errors.BoundaryError">245<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">BoundaryError</span></span><a class="headerlink" href="#email.errors.BoundaryError" title="Link to this definition">¶</a></dt>246<dd><p>Deprecated and no longer used.</p>247</dd></dl>248 249<dl class="py exception">250<dt class="sig sig-object py" id="email.errors.MultipartConversionError">251<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">MultipartConversionError</span></span><a class="headerlink" href="#email.errors.MultipartConversionError" title="Link to this definition">¶</a></dt>252<dd><p>Raised if the <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> method is called253on an instance of a class derived from254<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.255<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>).256<code class="xref py py-exc docutils literal notranslate"><span class="pre">MultipartConversionError</span></code> multiply257inherits 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>258</dd></dl>259 260<dl class="py exception">261<dt class="sig sig-object py" id="email.errors.HeaderWriteError">262<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">HeaderWriteError</span></span><a class="headerlink" href="#email.errors.HeaderWriteError" title="Link to this definition">¶</a></dt>263<dd><p>Raised when an error occurs when the <a class="reference internal" href="email.generator.html#module-email.generator" title="email.generator: Generate flat text email messages from a message structure."><code class="xref py py-mod docutils literal notranslate"><span class="pre">generator</span></code></a> outputs264headers.</p>265</dd></dl>266 267<dl class="py exception">268<dt class="sig sig-object py" id="email.errors.MessageDefect">269<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">MessageDefect</span></span><a class="headerlink" href="#email.errors.MessageDefect" title="Link to this definition">¶</a></dt>270<dd><p>This is the base class for all defects found when parsing email messages.271It is derived from <a class="reference internal" href="exceptions.html#ValueError" title="ValueError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">ValueError</span></code></a>.</p>272</dd></dl>273 274<dl class="py exception">275<dt class="sig sig-object py" id="email.errors.HeaderDefect">276<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">HeaderDefect</span></span><a class="headerlink" href="#email.errors.HeaderDefect" title="Link to this definition">¶</a></dt>277<dd><p>This is the base class for all defects found when parsing email headers.278It is derived from <a class="reference internal" href="#email.errors.MessageDefect" title="email.errors.MessageDefect"><code class="xref py py-exc docutils literal notranslate"><span class="pre">MessageDefect</span></code></a>.</p>279</dd></dl>280 281<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>282can find while parsing messages. Note that the defects are added to the message283where the problem was found, so for example, if a message nested inside a284<em class="mimetype">multipart/alternative</em> had a malformed header, that nested message285object would have a defect, but the containing messages would not.</p>286<p>All defect classes are subclassed from <a class="reference internal" href="#email.errors.MessageDefect" title="email.errors.MessageDefect"><code class="xref py py-class docutils literal notranslate"><span class="pre">email.errors.MessageDefect</span></code></a>.</p>287<dl class="py exception">288<dt class="sig sig-object py" id="email.errors.NoBoundaryInMultipartDefect">289<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">NoBoundaryInMultipartDefect</span></span><a class="headerlink" href="#email.errors.NoBoundaryInMultipartDefect" title="Link to this definition">¶</a></dt>290<dd><p>A message claimed to be a multipart, but had no <em class="mimetype">boundary</em>291parameter.</p>292</dd></dl>293 294<dl class="py exception">295<dt class="sig sig-object py" id="email.errors.StartBoundaryNotFoundDefect">296<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">StartBoundaryNotFoundDefect</span></span><a class="headerlink" href="#email.errors.StartBoundaryNotFoundDefect" title="Link to this definition">¶</a></dt>297<dd><p>The start boundary claimed in the <em class="mailheader">Content-Type</em> header was298never found.</p>299</dd></dl>300 301<dl class="py exception">302<dt class="sig sig-object py" id="email.errors.CloseBoundaryNotFoundDefect">303<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">CloseBoundaryNotFoundDefect</span></span><a class="headerlink" href="#email.errors.CloseBoundaryNotFoundDefect" title="Link to this definition">¶</a></dt>304<dd><p>A start boundary was found, but no corresponding close boundary was ever305found.</p>306<div class="versionadded">307<p><span class="versionmodified added">Added in version 3.3.</span></p>308</div>309</dd></dl>310 311<dl class="py exception">312<dt class="sig sig-object py" id="email.errors.FirstHeaderLineIsContinuationDefect">313<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">FirstHeaderLineIsContinuationDefect</span></span><a class="headerlink" href="#email.errors.FirstHeaderLineIsContinuationDefect" title="Link to this definition">¶</a></dt>314<dd><p>The message had a continuation line as its first header line.</p>315</dd></dl>316 317<dl class="py exception">318<dt class="sig sig-object py" id="email.errors.MisplacedEnvelopeHeaderDefect">319<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">MisplacedEnvelopeHeaderDefect</span></span><a class="headerlink" href="#email.errors.MisplacedEnvelopeHeaderDefect" title="Link to this definition">¶</a></dt>320<dd><p>A “Unix From” header was found in the middle of a header block.</p>321</dd></dl>322 323<dl class="py exception">324<dt class="sig sig-object py" id="email.errors.MissingHeaderBodySeparatorDefect">325<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">MissingHeaderBodySeparatorDefect</span></span><a class="headerlink" href="#email.errors.MissingHeaderBodySeparatorDefect" title="Link to this definition">¶</a></dt>326<dd><p>A line was found while parsing headers that had no leading white space but327contained no ‘:’. Parsing continues assuming that the line represents the328first line of the body.</p>329<div class="versionadded">330<p><span class="versionmodified added">Added in version 3.3.</span></p>331</div>332</dd></dl>333 334<dl class="py exception">335<dt class="sig sig-object py" id="email.errors.MalformedHeaderDefect">336<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">MalformedHeaderDefect</span></span><a class="headerlink" href="#email.errors.MalformedHeaderDefect" title="Link to this definition">¶</a></dt>337<dd><p>A header was found that was missing a colon, or was otherwise malformed.</p>338<div class="deprecated">339<p><span class="versionmodified deprecated">Deprecated since version 3.3: </span>This defect has not been used for several Python versions.</p>340</div>341</dd></dl>342 343<dl class="py exception">344<dt class="sig sig-object py" id="email.errors.MultipartInvariantViolationDefect">345<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">MultipartInvariantViolationDefect</span></span><a class="headerlink" href="#email.errors.MultipartInvariantViolationDefect" title="Link to this definition">¶</a></dt>346<dd><p>A message claimed to be a <em class="mimetype">multipart</em>, but no subparts were found.347Note that when a message has this defect, its348<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 return <code class="docutils literal notranslate"><span class="pre">False</span></code>349even though its content type claims to be <em class="mimetype">multipart</em>.</p>350</dd></dl>351 352<dl class="py exception">353<dt class="sig sig-object py" id="email.errors.InvalidBase64PaddingDefect">354<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">InvalidBase64PaddingDefect</span></span><a class="headerlink" href="#email.errors.InvalidBase64PaddingDefect" title="Link to this definition">¶</a></dt>355<dd><p>When decoding a block of base64 encoded bytes, the padding was not correct.356Enough padding is added to perform the decode, but the resulting decoded357bytes may be invalid.</p>358</dd></dl>359 360<dl class="py exception">361<dt class="sig sig-object py" id="email.errors.InvalidBase64CharactersDefect">362<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">InvalidBase64CharactersDefect</span></span><a class="headerlink" href="#email.errors.InvalidBase64CharactersDefect" title="Link to this definition">¶</a></dt>363<dd><p>When decoding a block of base64 encoded bytes, characters outside the base64364alphabet were encountered. The characters are ignored, but the resulting365decoded bytes may be invalid.</p>366</dd></dl>367 368<dl class="py exception">369<dt class="sig sig-object py" id="email.errors.InvalidBase64LengthDefect">370<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">InvalidBase64LengthDefect</span></span><a class="headerlink" href="#email.errors.InvalidBase64LengthDefect" title="Link to this definition">¶</a></dt>371<dd><p>When decoding a block of base64 encoded bytes, the number of non-padding372base64 characters was invalid (1 more than a multiple of 4). The encoded373block was kept as-is.</p>374</dd></dl>375 376<dl class="py exception">377<dt class="sig sig-object py" id="email.errors.InvalidDateDefect">378<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">email.errors.</span></span><span class="sig-name descname"><span class="pre">InvalidDateDefect</span></span><a class="headerlink" href="#email.errors.InvalidDateDefect" title="Link to this definition">¶</a></dt>379<dd><p>When decoding an invalid or unparsable date field. The original value is380kept as-is.</p>381</dd></dl>382 383</section>384 385 386 <div class="clearer"></div>387 </div>388 </div>389 </div>390 <div class="sphinxsidebar" role="navigation" aria-label="Main">391 <div class="sphinxsidebarwrapper">392 <div>393 <h4>Previous topic</h4>394 <p class="topless"><a href="email.policy.html"395 title="previous chapter"><code class="xref py py-mod docutils literal notranslate"><span class="pre">email.policy</span></code>: Policy Objects</a></p>396 </div>397 <div>398 <h4>Next topic</h4>399 <p class="topless"><a href="email.headerregistry.html"400 title="next chapter"><code class="xref py py-mod docutils literal notranslate"><span class="pre">email.headerregistry</span></code>: Custom Header Objects</a></p>401 </div>402 <script>403 document.addEventListener('DOMContentLoaded', () => {404 const title = document.querySelector('meta[property="og:title"]').content;405 const elements = document.querySelectorAll('.improvepage');406 const pageurl = window.location.href.split('?')[0];407 elements.forEach(element => {408 const url = new URL(element.href.split('?')[0].replace("-nojs", ""));409 url.searchParams.set('pagetitle', title);410 url.searchParams.set('pageurl', pageurl);411 url.searchParams.set('pagesource', "library/email.errors.rst");412 element.href = url.toString();413 });414 });415 </script>416 <div role="note" aria-label="source link">417 <h3>This page</h3>418 <ul class="this-page-menu">419 <li><a href="../bugs.html">Report a bug</a></li>420 <li><a class="improvepage" href="../improve-page-nojs.html">Improve this page</a></li>421 <li>422 <a href="https://github.com/python/cpython/blob/main/Doc/library/email.errors.rst?plain=1"423 rel="nofollow">Show source424 </a>425 </li>426 427 </ul>428 </div>429 </div>430<div id="sidebarbutton" title="Collapse sidebar">431<span>«</span>432</div>433 434 </div>435 <div class="clearer"></div>436 </div> 437 <div class="related" role="navigation" aria-label="Related">438 <h3>Navigation</h3>439 <ul>440 <li class="right" style="margin-right: 10px">441 <a href="../genindex.html" title="General Index"442 >index</a></li>443 <li class="right" >444 <a href="../py-modindex.html" title="Python Module Index"445 >modules</a> |</li>446 <li class="right" >447 <a href="email.headerregistry.html" title="email.headerregistry: Custom Header Objects"448 >next</a> |</li>449 <li class="right" >450 <a href="email.policy.html" title="email.policy: Policy Objects"451 >previous</a> |</li>452 453 <li><img src="../_static/py.svg" alt="Python logo" style="vertical-align: middle; margin-top: -1px"></li>454 <li><a href="https://www.python.org/">Python</a> »</li>455 <li class="switchers">456 <div class="language_switcher_placeholder"></div>457 <div class="version_switcher_placeholder"></div>458 </li>459 <li>460 461 </li>462 <li id="cpython-language-and-version">463 <a href="../index.html">3.15.0a6 Documentation</a> »464 </li>465 466 <li class="nav-item nav-item-1"><a href="index.html" >The Python Standard Library</a> »</li>467 <li class="nav-item nav-item-2"><a href="netdata.html" >Internet Data Handling</a> »</li>468 <li class="nav-item nav-item-3"><a href="email.html" ><code class="xref py py-mod docutils literal notranslate"><span class="pre">email</span></code> — An email and MIME handling package</a> »</li>469 <li class="nav-item nav-item-this"><a href=""><code class="xref py py-mod docutils literal notranslate"><span class="pre">email.errors</span></code>: Exception and Defect classes</a></li>470 <li class="right">471 472 473 <div class="inline-search" role="search">474 <form class="inline-search" action="../search.html" method="get">475 <input placeholder="Quick search" aria-label="Quick search" type="search" name="q" id="search-box">476 <input type="submit" value="Go">477 </form>478 </div>479 |480 </li>481 <li class="right">482<label class="theme-selector-label">483 Theme484 <select class="theme-selector" oninput="activateTheme(this.value)">485 <option value="auto" selected>Auto</option>486 <option value="light">Light</option>487 <option value="dark">Dark</option>488 </select>489</label> |</li>490 491 </ul>492 </div> 493 <div class="footer">494 © <a href="../copyright.html">Copyright</a> 2001 Python Software Foundation.495 <br>496 This page is licensed under the Python Software Foundation License Version 2.497 <br>498 Examples, recipes, and other code in the documentation are additionally licensed under the Zero Clause BSD License.499 <br>500 501 See <a href="/license.html">History and License</a> for more information.<br>502 503 504 <br>505 506 The Python Software Foundation is a non-profit corporation.507<a href="https://www.python.org/psf/donations/">Please donate.</a>508<br>509 <br>510 Last updated on Mar 10, 2026 (08:58 UTC).511 512 <a href="/bugs.html">Found a bug</a>?513 514 <br>515 516 Created using <a href="https://www.sphinx-doc.org/">Sphinx</a> 8.2.3.517 </div>518 519 </body>520</html>