title: pip and easy_install > erroring out after trying to install tensorflow
body: <p>Trying to install tensor flow pip / easy_install both seem to have broken and I'm at a complete loss. Python (2.7.10) on the command line still seems to work. I don't really have anything worth keeping.  Is there anyway to just reset (or delete) everything both and just use pip (or even docker) to try again?</p>
  
  <p>Any ideas on the root cause? 
  (I'm certainly not a python expert and was just going through the install set up here <a href="https://www.tensorflow.org/install/install_mac" rel="nofollow noreferrer">https://www.tensorflow.org/install/install_mac</a>)</p>
  
  <p>pip:</p>
  
  <pre><code>bcmp-air:tensor1 paullb$ pip
  Traceback (most recent call last):
    File "/usr/local/bin/pip", line 5, in &lt;module&gt;
      from pkg_resources import load_entry_point
    File "/Library/Python/2.7/site-packages/pkg_resources/__init__.py", line 72, in &lt;module&gt;
      import packaging.requirements
    File "/Library/Python/2.7/site-packages/packaging/requirements.py", line 59, in &lt;module&gt;
      MARKER_EXPR = originalTextFor(MARKER_EXPR())("marker")
  TypeError: __call__() takes exactly 2 arguments (1 given)
  </code></pre>
  
  <p>And easy_install:</p>
  
  <pre><code>bcmp-air:tensor1 paullb$ easy_install
  Traceback (most recent call last):
    File "/usr/local/bin/easy_install", line 7, in &lt;module&gt;
      from setuptools.command.easy_install import main
    File "/Library/Python/2.7/site-packages/setuptools/__init__.py", line 12, in &lt;module&gt;
      import setuptools.version
    File "/Library/Python/2.7/site-packages/setuptools/version.py", line 1, in &lt;module&gt;
      import pkg_resources
    File "/Library/Python/2.7/site-packages/pkg_resources/__init__.py", line 72, in &lt;module&gt;
      import packaging.requirements
    File "/Library/Python/2.7/site-packages/packaging/requirements.py", line 59, in &lt;module&gt;
      MARKER_EXPR = originalTextFor(MARKER_EXPR())("marker")
  TypeError: __call__() takes exactly 2 arguments (1 given)
  </code></pre>