title: where should i put my owl file in order to loadable via python owlready
body: <p>I'm being in final project of my study. I analyze public conversation about governor election in twitter by mention and hashtag. And then I make an ontology from its result.
  The ontology I make manually with protege and wish to run this protege OWL file with python.
  According to <a href="http://pythonhosted.org/Owlready/onto.html#loading-an-ontology-from-owl" rel="nofollow noreferrer">this link</a>, we can load local copy of the OWL file</p>
  <pre><code>&gt;&gt;&gt; onto = onto_path.append(&quot;/path/to/owlready/onto/&quot;)
  </code></pre>
  <p>I tried similar line of above code like this</p>
  <pre><code>&gt;&gt;&gt; onto = onto_path.append(&quot;E:/dir/dir/ontologyfile.owl&quot;)
  &gt;&gt;&gt; onto.load()
  </code></pre>
  <p>but the error shows up, said that <code>'NoneType' object has no attribute 'load'</code>. How can i fix this?</p>