def by_location(self, location, cc=None, radius=None, term=None, num_biz_requested=None, category=None):
header, content = self._http_request(<EOL>self.BASE_URL, <EOL>location = location, <EOL>cc = cc,<EOL>radius = radius,<EOL>term = term,<EOL>num_biz_requested = num_biz_requested<EOL>)  <EOL>return json.loads(content)<EOL>
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)