title: Python - cannot import name viewkeys
body: <p>I'm importing a module which inturn imports <code>six</code>, but I'm getting this weird error. </p>
  
  <pre><code>Traceback (most recent call last):
    File "/Users/praful/Desktop/got/modules/categories/tests.py", line 13, in &lt;module&gt;
      import microdata
    File "build/bdist.macosx-10.10-intel/egg/microdata.py", line 4, in &lt;module&gt;
    File "/Library/Python/2.7/site-packages/html5lib/__init__.py", line 16, in &lt;module&gt;
      from .html5parser import HTMLParser, parse, parseFragment
    File "/Library/Python/2.7/site-packages/html5lib/html5parser.py", line 2, in &lt;module&gt;
      from six import with_metaclass, viewkeys, PY3
  ImportError: cannot import name viewkeys
  </code></pre>
  
  <p>I'd a look at <a href="https://github.com/JioCloud/python-six/blob/master/six.py" rel="noreferrer">six.py</a>, it has <code>viewkeys</code> in it. </p>
  
  <p>Latest <code>six==1.10.0</code> is installed.</p>