title: AttributeError: 'module' object has no attribute 'DefaultRoutingSearchParameters'
body: <p>I have installed the ortools exactly as mentioned in <a href="https://developers.google.com/optimization/introduction/installing/binary" rel="nofollow noreferrer">this</a> link.</p>
  
  <p>After that, I copied vehicle routing problem from the documentation and tried to execute.I am using python 2.7.12 in my system.</p>
  
  <p>I ended up with the below error:</p>
  
  <pre><code>   &gt;&gt;python or_test.py 
        Traceback (most recent call last):
        File "or_test.py", line 120, in &lt;module&gt;
        main()
        File "or_test.py", line 52, in main
       search_parameters = pywrapcp.DefaultRoutingSearchParameters()
     AttributeError: 'module' object has no attribute 
    'DefaultRoutingSearchParameters'
  </code></pre>
  
  <p>Example problem link :
  <a href="https://developers.google.com/optimization/routing/tsp/vehicle_routing" rel="nofollow noreferrer">https://developers.google.com/optimization/routing/tsp/vehicle_routing</a> </p>