title: ImportError: No module named 'psycopg2._psycopg'
body: <p>When I try to import <code>psycopg2</code> it show below log for me: </p>
  
  <pre><code>Traceback (most recent call last):
    File "D:/Desktop/learn/python/webcatch/appserver/testpgsql.py", line 2, in &lt;module&gt;
      import psycopg2
    File "D:/Desktop/learn/python/webcatch/appserver/webcatch/lib/site-packages/psycopg2-2.6.1-py3.5-win32.egg/psycopg2/__init__.py", line 50, in &lt;module&gt;
      from psycopg2._psycopg import BINARY, NUMBER, STRING, DATETIME, ROWID
  ImportError: No module named 'psycopg2._psycopg'
  </code></pre>
  
  <p>How can I solve it?
  My platform is win10 (64) and version is python 3.5</p>