title: Python 2.7 imports module from wrong location
body: <p>I'm on Python 2.7.6 un Ubuntu 14.04 and I'm trying to import openpyxl. I upraged to a recent version via <code>sudo pip install openpyxl --upgrade</code> and <code>pip show openpyxl</code> gives the following output:</p>
  
  <pre><code>pip show openpyxl
  ---
  Name: openpyxl
  Version: 2.3.3
  Location: /usr/local/lib/python2.7/dist-packages
  Requires: 
  </code></pre>
  
  <p>However, when inside python, after I <code>import openpyxl</code> It seems to load it from a different location: <code>/usr/lib</code> instead of <code>/usr/local/lib</code></p>
  
  <pre><code>openpyxl.__version__
  '1.7.0'
  openpyxl.__file__
  '/usr/lib/pymodules/python2.7/openpyxl/__init__.pyc'
  </code></pre>
  
  <p>I have set the <code>$PYTHONPATH</code> to <code>/usr/local/lib/python2.7/dist-packages</code></p>
  
  <p>And when looking at <code>sys.path</code> I get this output:</p>
  
  <pre><code>['', '/usr/local/lib/python2.7/dist-packages',... and 12 other locations]
  </code></pre>
  
  <p>It seems to have my desired location in first. Nevertheless the wrong module gets loaded.</p>
  
  <p><strong>EDIT:</strong></p>
  
  <p>Contents of <code>$PATH</code>:</p>
  
  <pre><code>/misc/software-lin/lmbsoft/build/x86_64-gcc4.8/release/bin:/misc/software-lin/lmbsoft/build/x86_64-gcc4.8/debug/bin:/misc/software-lin/lmbsoft/build/x86_64-gcc4.8/bin:/home/maid/phd/3rdpartySoft/art-2009-03-12/bin:/home/maid/phd/3rdpartySoft/ANTs-1.9.x-Linux/bin:/misc/software-lin/lmbsoft/build/x86_64-gcc4.8/release/bin:/misc/software-lin/lmbsoft/build/x86_64-gcc4.8/debug/bin:/misc/software-lin/lmbsoft/build/x86_64-gcc4.8/bin:/home/maid/phd/3rdpartySoft/art-2009-03-12/bin:/home/maid/phd/3rdpartySoft/ANTs-1.9.x-Linux/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:.:/home/maid/bin:/misc/software-lin/matlabR2015a/bin:/home/maid/phd/3rdpartySoft/nifty_reg-1.3/niftyreg_install/bin:/misc/software-lin/lmbsoft/cudatoolkit-3.2.16-x86_64/cuda/bin:/misc/database/cv2/local/bin:/misc/software-lin/vibez/bin:/usr/lib/jvm/java-6-openjdk/jre/bin:/misc/software-lin/vivi:/home/maid/localsoft/voreen/voreen-src-3.0.1-unix/bin/:/home/maid/tmp/ij146/ImageJ:.:/home/maid/bin:/misc/software-lin/matlabR2015a/bin:/home/maid/phd/3rdpartySoft/nifty_reg-1.3/niftyreg_install/bin:/misc/software-lin/lmbsoft/cudatoolkit-3.2.16-x86_64/cuda/bin:/misc/database/cv2/local/bin:/misc/software-lin/vibez/bin:/usr/lib/jvm/java-6-openjdk/jre/bin:/misc/software-lin/vivi:/home/maid/localsoft/voreen/voreen-src-3.0.1-unix/bin/:/home/maid/tmp/ij146/ImageJ
  </code></pre>
  
  <p>Any help appreciated, 
  thanks, Dominic</p>