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When used on object types for which they do not apply, they will raise a Python exception.</p> <p>It is not possible to use these functions on objects that are not properly initialized, such as a list object that has been created by <a class="reference internal" href="list.html#PyList_New" title="PyList_New"><tt class="xref c c-func docutils literal"><span class="pre">PyList_New()</span></tt></a>, but whose items have not been set to some non-<tt class="docutils literal"><span class="pre">NULL</span></tt> value yet.</p> <div class="toctree-wrapper compound"> <ul> <li class="toctree-l1"><a class="reference internal" href="object.html">Object Protocol</a></li> <li class="toctree-l1"><a class="reference internal" href="number.html">Number Protocol</a></li> <li class="toctree-l1"><a class="reference internal" href="sequence.html">Sequence Protocol</a></li> <li class="toctree-l1"><a class="reference internal" href="mapping.html">Mapping Protocol</a></li> <li class="toctree-l1"><a class="reference internal" href="iter.html">Iterator Protocol</a></li> <li class="toctree-l1"><a class="reference internal" href="objbuffer.html">Old Buffer Protocol</a></li> </ul> </div> </div> </div> </div> </div> <div class="sphinxsidebar"> <div class="sphinxsidebarwrapper"> <h4>Previous topic</h4> <p class="topless"><a href="codec.html" title="previous chapter">Codec registry and support functions</a></p> <h4>Next topic</h4> <p class="topless"><a href="object.html" title="next chapter">Object Protocol</a></p> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../bugs.html">Report a Bug</a></li> <li><a href="../_sources/c-api/abstract.txt" rel="nofollow">Show Source</a></li> </ul> <div id="searchbox" style="display: none"> <h3>Quick search</h3> <form class="search" action="../search.html" method="get"> <input type="text" name="q" /> <input type="submit" value="Go" /> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form> <p class="searchtip" style="font-size: 90%"> Enter search terms or a module, class or function name. </p> </div> <script type="text/javascript">$('#searchbox').show(0);</script> </div> </div> <div class="clearer"></div> </div> <div class="related"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" >index</a></li> <li class="right" > <a href="../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="object.html" title="Object Protocol" >next</a> |</li> <li class="right" > <a href="codec.html" title="Codec registry and support functions" >previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="http://www.python.org/">Python</a> »</li> <li> <a href="../index.html">Python 2.7.5 documentation</a> » </li> <li><a href="index.html" >Python/C API Reference Manual</a> »</li> </ul> </div> <div class="footer"> © <a href="../copyright.html">Copyright</a> 1990-2020, Python Software Foundation. <br /> The Python Software Foundation is a non-profit corporation. <a href="http://www.python.org/psf/donations/">Please donate.</a> <br /> Last updated on Oct 13, 2020. <a href="../bugs.html">Found a bug</a>? <br /> Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 1.1.3. </div> </body> </html>