docs: def contains (self, point):
      """contains(point) -> True | False
  
      Returns True if point is contained inside this Rectangle, False otherwise.
  
      Examples:
      
      >>> r = Rect( Point(-1, -1), Point(1, 1) )
      >>> r.contains( Point(0, 0) )
      True
  
      >>> r.contains( Point(2, 3) )
      False
      """
      return (point.x >= self.ul.x and point.x <= self.lr.x) and \
             (point.y >= self.ul.y and point.y <= self.lr.y)