<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Python Objects and QVariant — PyQt 4.10.3 Reference Guide</title> <link rel="stylesheet" href="_static/default.css" type="text/css" /> <link rel="stylesheet" href="_static/pygments.css" type="text/css" /> <script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT: '', VERSION: '4.10.3', COLLAPSE_INDEX: false, FILE_SUFFIX: '.html', HAS_SOURCE: true }; </script> <script type="text/javascript" src="_static/jquery.js"></script> <script type="text/javascript" src="_static/underscore.js"></script> <script type="text/javascript" src="_static/doctools.js"></script> <link rel="shortcut icon" href="_static/logo_tn.ico"/> <link rel="top" title="PyQt 4.10.3 Reference Guide" href="index.html" /> <link rel="next" title="Support for QSettings" href="pyqt_qsettings.html" /> <link rel="prev" title="The PyQt4 Resource System" href="resources.html" /> </head> <body> <div class="related"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="genindex.html" title="General Index" accesskey="I">index</a></li> <li class="right" > <a href="py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="pyqt_qsettings.html" title="Support for QSettings" accesskey="N">next</a> |</li> <li class="right" > <a href="resources.html" title="The PyQt4 Resource System" accesskey="P">previous</a> |</li> <li><a href="index.html">PyQt 4.10.3 Reference Guide</a> »</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body"> <div class="section" id="python-objects-and-qvariant"> <h1>Python Objects and QVariant<a class="headerlink" href="#python-objects-and-qvariant" title="Permalink to this headline">ΒΆ</a></h1> <p>Qt uses the <tt class="docutils literal"><span class="pre">QVariant</span></tt> class as a wrapper for any C++ data type. PyQt4 allows any Python object to be wrapped as a <tt class="docutils literal"><span class="pre">QVariant</span></tt> and passed around Qt’s meta-object system like any other type.</p> <p>PyQt4 will try to convert the Python object to a C++ equivalent if it can so that the <tt class="docutils literal"><span class="pre">QVariant</span></tt> can be passed to other C++ code that doesn’t know what a Python object is.</p> <p>Version 2 of PyQt4’s <tt class="docutils literal"><span class="pre">QVariant</span></tt> API will automatically convert a <tt class="docutils literal"><span class="pre">QVariant</span></tt> back to a Python object of the correct type.</p> <p>Version 1 of the <tt class="docutils literal"><span class="pre">QVariant</span></tt> API provides the <tt class="docutils literal"><span class="pre">QVariant.toPyObject()</span></tt> method to convert the <tt class="docutils literal"><span class="pre">QVariant</span></tt> back to a Python object of the correct type.</p> <p>Both versions will raise a Python exception if the conversion cannot be done.</p> </div> </div> </div> </div> <div class="sphinxsidebar"> <div class="sphinxsidebarwrapper"> <p class="logo"><a href="index.html"> <img class="logo" src="_static/logo.png" alt="Logo"/> </a></p> <h4>Previous topic</h4> <p class="topless"><a href="resources.html" title="previous chapter">The PyQt4 Resource System</a></p> <h4>Next topic</h4> <p class="topless"><a href="pyqt_qsettings.html" title="next chapter">Support for QSettings</a></p> <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="pyqt_qsettings.html" title="Support for QSettings" >next</a> |</li> <li class="right" > <a href="resources.html" title="The PyQt4 Resource System" >previous</a> |</li> <li><a href="index.html">PyQt 4.10.3 Reference Guide</a> »</li> </ul> </div> <div class="footer"> © Copyright 2013 Riverbank Computing Limited. Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 1.1.3. </div> </body> </html>