title: ImportError: matplotlib requires dateutil
body: <p>I have successfully installed matplotlib with python 2.6 on x64 Windows7. When I try to import matplotlib, it shows the following error. I have also installed numpy following this link: <a href="https://stackoverflow.com/questions/11200137/installing-numpy-on-64bit-windows-7-with-python-2-7-3">Installing Numpy on 64bit Windows 7 with Python 2.7.3</a></p>
  
  <pre><code>import matplotlib.pyplot as plt
  
  Traceback (most recent call last):
    File "&lt;pyshell#2&gt;", line 1, in &lt;module&gt;
      import matplotlib.pyplot as plt
    File "C:\Python26\Lib\site-packages\matplotlib\__init__.py", line 110, in &lt;module&gt;
      raise ImportError("matplotlib requires dateutil")
  ImportError: matplotlib requires dateutil
  </code></pre>
  
  <p>How can I make it work?</p>
  
  <p>I installed matplotlib-1.3.0.win-amd64-py2.6.exe from <a href="http://matplotlib.org/downloads.html" rel="noreferrer">http://matplotlib.org/downloads.html</a></p>