title: Check requirements for python 3 support
body: <p>I have several python projects with different set of dependencies listed in <a href="http://pip.readthedocs.org/en/latest/user_guide.html#requirements-files">pip requirements files</a>. I've started to think about porting the code to python 3, but I need to know if my dependencies are already there.</p>
  
  <p>Is it possible to check what packages from a <code>requirements.txt</code> file support python 3 and what don't? </p>
  
  <p>Example <code>requirements.txt</code> contents:</p>
  
  <pre><code>mysql-python==1.2.5
  lxml==3.3.4
  Fabric==1.8.0
  </code></pre>
  
  <p>From this list, only <code>lxml</code> supports python 3.</p>
  
  <hr>
  
  <p>Just a side note.</p>
  
  <p>There is a <a href="https://python3wos.appspot.com/">Python 3 Wall of Superpowers</a> (<a href="https://code.google.com/p/python3wos/">python3wos</a> project) that shows python 3 support of popular python packages.</p>
  
  <p>As far as I understand, <code>python3wos</code> periodically parses the <code>Python Package Index</code> html pages and <a href="https://code.google.com/p/python3wos/source/browse/pypi_parser.py">checks</a> for the <code>Programming Language :: Python :: 3</code> text to define whether a packages supports python 3rd branch or not. Isn't there anything simpler than scraping the html on PyPI?</p>