"""Class Point"""
check_num= lambda num : isinstance(num,(int,float))
class Point:
    def __init__(self,x,y):
        if check_num(x)==False:
            raise ValueError("x must be an intger/float")
        if check_num(y)==False:
            raise ValueError("y must be an intger/float")
        self.__x = x
        self.__y = y
    """setters"""
    def set_x(self,x):
        if check_num(x)==False:
            raise ValueError("x must be an intger/float")
        self.__x = x
    def set_y(self,y):
        if check_num(y)==False:
            raise ValueError("y must be an intger/float")
        self.__y = y
    """getters"""
    def get_x(self):
        return self.__x
    def get_y(self):
        return self.__y
    """str method"""
    def __str__(self):
        return "("+'%.2f' % self.__x +","+ '%.2f' % self.__y+")"
a=5
b=Point(52,321.11)
"""Class Line"""
is_point = lambda point : isinstance(point,(Point))
class Line:
    def __init__(self,p,q):
        if is_point(q)==False:
            raise Exception("your Value must be Point type.")
        if is_point(p)==False:
            raise Exception("your Value must be Point type.")
        self.__p = p
        self.__q = q
    """setters"""
    def set_q(self,q):
        if is_point(q)==False:
            raise Exception("your Value must be Point type.")
        self.__q = q
    def set_p(self,p):
        if is_point(p)==False:
            raise Exception("your Value must be Point type.")
        self.__p = p
    """getters"""
    def get_q(self):
        return self.__q
    def get_p(self):
        return self.__p