code: def get_nearest_points(self, center_point, radius, unit='km'):
          
          assert isinstance(center_point, GeoPoint), \
              'point should be GeoPoint instance'
          for point in self.get_nearest_points_dirty(center_point, radius):
              distance = point.distance_to(center_point, unit)
              if distance <= radius:
                  yield point, distance
docs: return list of geo points from circle with given center and radius
          :param center_point: GeoPoint with center of search circle
          :param radius: radius of search circle
          :return: generator with tuple with GeoPoints and distance