class Point:
    def __init__(self,x,y):
        self.x = x
        self.y = y
class Rect:
    def __init__(self,lefttop_point,rightbottom_point):
        self.lefttop = lefttop_point
        self.rightbottom = rightbottom_point
    def __contains__(self,y):
        if self.lefttop.x<=y.x<=self.rightbottom.x and self.lefttop.y<=y.y<=self.rightbottom.y:
            return True
        else:
            return False
rectA = Rect(Point(10,10),Point(20,5))
print(Point(15,18) in rectA)