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Python: geocode address via urllib

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  1. import urllib,urllib2,time
  2. addr_file = 'addresses.csv'
  3. out_file  = 'addresses_geocoded.csv'
  4. out_file_failed = 'failed.csv'
  5. sleep_time = 2
  6. root_url = "http://maps.google.com/maps/geo?"
  7. gkey = "YourGoogleKeyGoesHere"
  8. return_codes = {'200':'SUCCESS',
  9. 				'400':'BAD REQUEST',
  10. 				'500':'SERVER ERROR',
  11. 				'601':'MISSING QUERY',
  12. 				'602':'UNKOWN ADDRESS',
  13. 				'603':'UNAVAILABLE ADDRESS',
  14. 				'604':'UNKOWN DIRECTIONS',
  15. 				'610':'BAD KEY',
  16. 				'620':'TOO MANY QUERIES'
  17. 				}
  18. def geocode(addr,out_fmt='csv'):
  19. 	#encode our dictionary of url parameters
  20. 	values = {'q' : addr, 'output':out_fmt, 'key':gkey}
  21. 	data = urllib.urlencode(values)
  22. 	#set up our request
  23. 	url = root_url+data
  24. 	req = urllib2.Request(url)
  25. 	#make request and read response
  26. 	response = urllib2.urlopen(req)
  27. 	geodat = response.read().split(',')
  28. 	response.close()
  29. 	#handle the data returned from google
  30. 	code = return_codes[geodat[0]]
  31. 	if code == 'SUCCESS':
  32. 		code,precision,lat,lng = geodat
  33. 		return {'code':code,'precision':precision,'lat':lat,'lng':lng}
  34. 	else:
  35. 		return {'code':code}
  36. def main():
  37. 	#open our i/o files
  38. 	outf = open(out_file,'w')
  39. 	outf_failed = open(out_file_failed,'w')
  40. 	inf = open(addr_file,'r')
  41. 	for address in inf:
  42. 		#get latitude and longitude of address
  43. 		data = geocode(address)
  44. 		#output results and log to file
  45. 		if len(data)>1:
  46. 			print "Latitude and Longitude of "+address+":"
  47. 			print "\tLatitude:",data['lat']
  48. 			print "\tLongitude:",data['lng']
  49. 			outf.write(address.strip()+data['lat']+','+data['lng']+'\n')
  50. 			outf.flush()
  51. 		else:
  52. 			print "Geocoding of '"+addr+"' failed with error code "+data['code']
  53. 			outf_failed.write(address)
  54. 			outf_failed.flush()
  55. 		#play nice and don't just pound the server with requests
  56. 		time.sleep(sleep_time)
  57. 	#clean up
  58. 	inf.close()
  59. 	outf.close()
  60. 	outf_failed.close()
  61. if __name__ == "__main__":
  62. 	main()

URL: http://canadianamp.ca/2008/12/05/simple-geocoding-with-python-and-urllib/

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