title: Installing rpy2 for Python 3 using pip
body: <p>I am trying to install the <code>rpy2</code> package for python 3 on Windows 7. So I simply typed pip install rpy2 in the command line. However, it fails for a reason I do not understand, could anyone clear this up please? It threw back the following in the command line:</p>
  
  <pre><code>    Collecting rpy2
      Using cached rpy2-2.8.2.tar.gz
      Complete output from command python setup.py egg_info:
      Warning: Tried to guess R's HOME but no command &lt;R&gt; in the PATH.
      _______________________________
      Command "python setup.py egg_info" failed with error code 1 in C:\Users\...\AppData\Local\Temp\pip-build-14jn4kdx\rpy2\
  </code></pre>