docs: def by_location(self, location, cc=None, radius=None, term=None, num_biz_requested=None, category=None):
          """
          Perform a Yelp Review Search based on a location specifier.
  
          Args:
            location - textual location specifier of form: "address, neighborhood, city, state or zip, optional country"
            cc       - ISO 3166-1 alpha-2 country code. (Optional)
            radius   - search radius (in miles) (Optional)
            term     - Search term to filter by (Optional)
            num_biz_requested - Maximum number of matching results to return (Optional)
            category - '+'-seperated list of categories to filter by. See
          http://www.yelp.com/developers/documentation/category_list
          			  for list of valid categories. (Optional)
          """
  
          header, content = self._http_request(
              self.BASE_URL, 
              location = location, 
              cc = cc,
              radius = radius,
              term = term,
              num_biz_requested = num_biz_requested
          )		
          return json.loads(content)