title: PyQt5 failing import of QtGui
body: <p>I've just moved from PyQt4 to 5 and I'm having an issue with QtGui.  I installed using the 32bit windows installer, not my own build.  </p>
  
  <p>when I do:</p>
  
  <pre><code>from PyQt5 import QtGui
  </code></pre>
  
  <p>I get</p>
  
  <pre><code>class MainWindow(QtGui.QMainWindow, UI.MainUI.Ui_MainWindow):
  AttributeError: 'module' object has no attribute 'QMainWindow'
  </code></pre>
  
  <p>so I tried</p>
  
  <pre><code>from PyQt5.QtWidgets import QtGui
  </code></pre>
  
  <p>Which results in:</p>
  
  <pre><code>ImportError: cannot import name QtGui
  </code></pre>
  
  <p>then I tried to change the sys.path according to <a href="https://stackoverflow.com/questions/11335722/pyinstaller-importerror-cannot-import-name-qtgui">Pyinstaller: ImportError: cannot import name QtGui</a> work around but it still gives me the same</p>
  
  <pre><code>ImportError: cannot import name QtGui
  </code></pre>
  
  <p><em>Update:</em> It looks like I do in fact import QtGui because when I go in IDLE and try it, it still autocompletes QMovie and a whole bunch of other attributes.  Is there any reason QMainWindow just wouldn't be in there?  (It's not, neither is QDialog and they seem important)</p>