code: def by_bounding_box(self, tl_lat, tl_long, br_lat, br_long, term=None, num_biz_requested=None, category=None):
          
  
          header, content = self._http_request(
              self.BASE_URL, 
              tl_lat  = tl_lat, 
              tl_long = tl_long,
              br_lat  = br_lat, 
              br_long = br_long,
              term    = term,
              category = category,
              num_biz_requested = num_biz_requested
          )		
          return json.loads(content)
docs: Perform a Yelp Review Search based on a map bounding box.
  
          Args:
            tl_lat   - bounding box top left latitude 
            tl_long  - bounding box top left longitude  
            br_lat   - bounding box bottom right latitude
            br_long  - bounding box bottom right longitude
            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)