title: Python open url with urllib than get back the changed url of opened webpage
body: <p>I want to send some requests to Google maps. I open the url that is changed based on the request. And I want to get back the changed url.
  An example:</p>
  
  <pre><code>import urllib, urllib2
  
  my_address = '1600 Amphitheatre Parkway Mountain View, CA 94043'
  data = urllib.urlencode({'output':'csv', 'q':my_address})
  req = urllib2.Request('https://www.google.co.uk/maps/place?' + data)
  res_0 = urllib2.urlopen(req)
  print res_0.geturl()
  </code></pre>
  
  <p>url to open (<code>res_0.geturl()</code>):</p>
  
  <p><code>'https://www.google.co.uk/maps/search/1600+Amphitheatre+Parkway+Mountain+View,+CA+94043/data=!4m2!2m1!4b1?dg=dbrw&amp;newdg=1'</code></p>
  
  <p>And I want to get back the changed url, that is:</p>
  
  <p><code>'https://www.google.co.uk/maps/place/1600+Amphitheatre+Pkwy,+Mountain+View,+CA+94043,+USA/@37.4223371,-122.0866079,17z/data=!3m1!4b1!4m5!3m4!1s0x808fba027820e5d9:0x60a90600ff6e7e6e!8m2!3d37.4223329!4d-122.0844192'</code></p>
  
  <p>I opened the <code>res_0</code> url in the browser manually and I get the above changed url.</p>
  
  <p>How can I do that?</p>
  
  <p>Thank you!</p>