title: python script library error while continuously executing script
body: <p>Error while running python script to get pixel points from google static map image. I got the python script from <a href="https://stackoverflow.com/questions/5401661/google-maps-how-to-get-buildings-polygon-coordinates-from-address">Google maps - how to get building&#39;s polygon coordinates from address?</a>
  I use python2.7 to execute the script
  Initially when i was running the script i was not getting any error, but after continuous running for 3-4 hours i am getting the following error </p>
  
  <pre><code>Traceback (most recent call last):
  File "pyscript.py", line 19, in &lt;module&gt;
  imgBuildings = io.imread(urlBuildings)
  File "/usr/local/lib/python2.7/dist-packages/skimage/io/_io.py", line 60, in i
  with file_or_url_context(fname) as fname:
  File "/usr/lib/python2.7/contextlib.py", line 17, in __enter__
  return self.gen.next()
  File "/usr/local/lib/python2.7/dist-packages/skimage/io/util.py", line 29, in
  u = urlopen(resource_name)
  File "/usr/lib/python2.7/urllib2.py", line 154, in urlopen
  return opener.open(url, data, timeout)
  File "/usr/lib/python2.7/urllib2.py", line 435, in open
  response = meth(req, response)
  File "/usr/lib/python2.7/urllib2.py", line 548, in http_response
  'http', request, response, code, msg, hdrs)
  File "/usr/lib/python2.7/urllib2.py", line 473, in error
  return self._call_chain(*args)
  File "/usr/lib/python2.7/urllib2.py", line 407, in _call_chain
  result = func(*args)
  File "/usr/lib/python2.7/urllib2.py", line 556, in http_error_default
  raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)
  urllib2.HTTPError: HTTP Error 403: Forbidden
  </code></pre>
  
  <p>AS i am new to python i am not sure how to fix it ? Is this some kind of cache issue?
  Help very much appreciated.</p>