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<div class="section" id="using-pyqt4-from-the-python-shell">
<h1>Using PyQt4 from the Python Shell<a class="headerlink" href="#using-pyqt4-from-the-python-shell" title="Permalink to this headline">¶</a></h1>
<p>PyQt4 installs an input hook (using <tt class="docutils literal"><span class="pre">PyOS_InputHook</span></tt>) that processes events
when an interactive interpreter is waiting for user input. This means that
you can, for example, create widgets from the Python shell prompt, interact
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<p>For example, if you enter the following in the Python shell:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="kn">from</span> <span class="nn">PyQt4</span> <span class="kn">import</span> <span class="n">QtGui</span>
<span class="gp">>>> </span><span class="n">a</span> <span class="o">=</span> <span class="n">QtGui</span><span class="o">.</span><span class="n">QApplication</span><span class="p">([])</span>
<span class="gp">>>> </span><span class="n">w</span> <span class="o">=</span> <span class="n">QtGui</span><span class="o">.</span><span class="n">QWidget</span><span class="p">()</span>
<span class="gp">>>> </span><span class="n">w</span><span class="o">.</span><span class="n">show</span><span class="p">()</span>
<span class="gp">>>> </span><span class="n">w</span><span class="o">.</span><span class="n">hide</span><span class="p">()</span>
<span class="go">>>></span>
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<p>The widget would be displayed when <tt class="docutils literal"><span class="pre">w.show()</span></tt> was entered amd hidden as soon
as <tt class="docutils literal"><span class="pre">w.hide()</span></tt> was entered.</p>
<p>The installation of an input hook can cause problems for certain applications
(particularly those that implement a similar feature using different means).
The <tt class="xref py py-mod docutils literal"><span class="pre">QtCore</span></tt> module contains the
<tt class="xref py py-func docutils literal"><span class="pre">pyqtRemoveInputHook()</span></tt> and
<tt class="xref py py-func docutils literal"><span class="pre">pyqtRestoreInputHook()</span></tt> functions that remove and restore
the input hook respectively.</p>
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