In this recipe, you will geocode addresses using web geocoding APIs, such as Google Maps, Yahoo! Maps, Geocoder, GeoNames, and so on. Be sure to read the terms of service of these APIs carefully before using them in production.
The geopy Python library (https://github.com/geopy/geopy) offers convenient uniform access to all of these web services. Therefore, you will use it to create a PL/Python PostgreSQL function that can be used in your SQL commands to query all of these engines.
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