title: PyQt Import Error
body: <p>I have a very simple PyQt program</p>
  
  <pre><code>import sys
  from PyQt4.QtGui import *
  
  app = QApplication(sys.argv)
  
  widget = QWidget()
  widget.show()
  
  sys.exit(app.exec_())
  </code></pre>
  
  <p>When I double click to run the program, it runs successfully.
  But when I run it in command line: python test.py, I got the following error</p>
  
  <pre><code>Traceback (most recent call last):
    File "test.py", line 2, in &lt;module&gt;
      from PyQt4.QtGui import *
  ImportError: No module named PyQt4.QtGui
  </code></pre>