title: %matplotlib qt does not work
body: <p><code>Python 2.7.12 |Anaconda 4.2.0 (64-bit)| Spyder 3.0.1| IPython 5.1.0</code> (Running on Windows)</p>
  
  <p>When asking for plots in a new window via:</p>
  
  <pre><code>%matplotlib qt
  </code></pre>
  
  <p>I get an error:</p>
  
  <pre><code>Traceback (most recent call last):
  
    File "&lt;ipython-input-2-6ad73d0e50c7&gt;", line 1, in &lt;module&gt;
      get_ipython().magic(u'matplotlib qt')
  
    File "C:\Anaconda2\lib\site-packages\IPython\core\interactiveshell.py", line 2158, in magic
      return self.run_line_magic(magic_name, magic_arg_s)
  
    File "C:\Anaconda2\lib\site-packages\IPython\core\interactiveshell.py", line 2079, in run_line_magic
      result = fn(*args,**kwargs)
  
    File "&lt;decorator-gen-105&gt;", line 2, in matplotlib
  
    File "C:\Anaconda2\lib\site-packages\IPython\core\magic.py", line 188, in &lt;lambda&gt;
      call = lambda f, *a, **k: f(*a, **k)
  
    File "C:\Anaconda2\lib\site-packages\IPython\core\magics\pylab.py", line 100, in matplotlib
      gui, backend = self.shell.enable_matplotlib(args.gui)
  
    File "C:\Anaconda2\lib\site-packages\IPython\core\interactiveshell.py", line 2947, in enable_matplotlib
      pt.activate_matplotlib(backend)
  
    File "C:\Anaconda2\lib\site-packages\IPython\core\pylabtools.py", line 295, in activate_matplotlib
      matplotlib.pyplot.switch_backend(backend)
  
    File "C:\Anaconda2\lib\site-packages\matplotlib\pyplot.py", line 232, in switch_backend
      _backend_mod, new_figure_manager, draw_if_interactive, _show = pylab_setup()
  
    File "C:\Anaconda2\lib\site-packages\matplotlib\backends\__init__.py", line 32, in pylab_setup
      globals(),locals(),[backend_name],0)
  
    File "C:\Anaconda2\lib\site-packages\matplotlib\backends\backend_qt4agg.py", line 18, in &lt;module&gt;
      from .backend_qt5agg import FigureCanvasQTAggBase as _FigureCanvasQTAggBase
  
    File "C:\Anaconda2\lib\site-packages\matplotlib\backends\backend_qt5agg.py", line 16, in &lt;module&gt;
      from .backend_qt5 import QtCore
  
    File "C:\Anaconda2\lib\site-packages\matplotlib\backends\backend_qt5.py", line 31, in &lt;module&gt;
      from .qt_compat import QtCore, QtGui, QtWidgets, _getSaveFileName, __version__
  
    File "C:\Anaconda2\lib\site-packages\matplotlib\backends\qt_compat.py", line 137, in &lt;module&gt;
      from PyQt4 import QtCore, QtGui
  
  ImportError: No module named PyQt4
  </code></pre>