title: error: could not create '/Library/Python/2.7/site-packages/xlrd': Permission denied
body: <p>I'm trying to install xlrd on mac 10.8.4 to be able to read excel files through python.</p>
  
  <p>I have followed the instructions on <a href="http://www.simplistix.co.uk/presentations/python-excel.pdf">http://www.simplistix.co.uk/presentations/python-excel.pdf</a></p>
  
  <p>I did this:</p>
  
  <ol>
  <li><p>unzipped the folder to desktop</p></li>
  <li><p>in terminal, cd to the unzipped folder</p></li>
  <li><p>$ python setup.py install</p></li>
  </ol>
  
  <p>This is what I get:</p>
  
  <pre><code>running install
  running build
  running build_py
  creating build
  creating build/lib
  creating build/lib/xlrd
  copying xlrd/__init__.py -&gt; build/lib/xlrd
  copying xlrd/biffh.py -&gt; build/lib/xlrd
  copying xlrd/book.py -&gt; build/lib/xlrd
  copying xlrd/compdoc.py -&gt; build/lib/xlrd
  copying xlrd/formatting.py -&gt; build/lib/xlrd
  copying xlrd/formula.py -&gt; build/lib/xlrd
  copying xlrd/info.py -&gt; build/lib/xlrd
  copying xlrd/licences.py -&gt; build/lib/xlrd
  copying xlrd/sheet.py -&gt; build/lib/xlrd
  copying xlrd/timemachine.py -&gt; build/lib/xlrd
  copying xlrd/xldate.py -&gt; build/lib/xlrd
  copying xlrd/xlsx.py -&gt; build/lib/xlrd
  creating build/lib/xlrd/doc
  copying xlrd/doc/compdoc.html -&gt; build/lib/xlrd/doc
  copying xlrd/doc/xlrd.html -&gt; build/lib/xlrd/doc
  creating build/lib/xlrd/examples
  copying xlrd/examples/namesdemo.xls -&gt; build/lib/xlrd/examples
  copying xlrd/examples/xlrdnameAPIdemo.py -&gt; build/lib/xlrd/examples
  running build_scripts
  creating build/scripts-2.7
  copying and adjusting scripts/runxlrd.py -&gt; build/scripts-2.7
  changing mode of build/scripts-2.7/runxlrd.py from 644 to 755
  running install_lib
  creating /Library/Python/2.7/site-packages/xlrd
  error: could not create '/Library/Python/2.7/site-packages/xlrd': Permission denied
  </code></pre>
  
  <p>Why is permission denied? Thanks</p>