code: def get_from_postcode(self, postcode, distance, skip_cache=False):
          
          distance = float(distance)
          if distance < 0:
              raise IllegalDistanceException("Distance must not be negative")
          # remove spaces and change case here due to caching
          postcode = postcode.lower().replace(' ', '')
          return self._lookup(skip_cache, get_from_postcode, postcode, 
                              float(distance))
docs: Calls `postcodes.get_from_postcode` but checks correctness of 
          `distance`, and by default utilises a local cache.
  
          :param skip_cache: optional argument specifying whether to skip 
                             the cache and make an explicit request.
  
          :raises IllegalPointException: if the latitude or longitude 
                                         are out of bounds.
  
          :returns: a list of dicts containing postcode data within the 
                    specified distance.