title: socket installation error in python2.7
body: <pre><code> python2.7 -m pip install socket
   Collecting socket
   Using cached socket-0.5.tar.gz
    Complete output from command python setup.py egg_info:
  Traceback (most recent call last):
  File "&lt;string&gt;", line 1, in &lt;module&gt;
  File "/tmp/pip-build-NGBb1T/socket/setup.py", line 2, in &lt;module&gt; raise RuntimeError("Package 'socket' must not be downloaded from pypi")
  RuntimeError: Package 'socket' must not be downloaded from pypi
  </code></pre>
  
  <p>Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-NGBb1T/socket/</p>