TypeError: point_class.dis_m() missing 1 required positional argument: ‘y2’

这段代码为什么出错

一个又一个错误

终于摸到点头绪

#distance方法 我做的叫get_dis_m

    def get_dis_m(self):

        a_m = self.__x1 - self.__x2
        b_m = self.__y1 - self.__y2
        return (pow(a_m, 2) + pow(b_m, 2)) ** 0.5


x_1, y_1, x_2, y_2 = 2.1, 2.3, 19.1, 19.2
a1=point_class(x_1, y_1, x_2, y_2).get_dis_m()
print(a1)

经过对第8章的复习,我做出了下面的代码

class point_class:
    def __init__(self, x1, y1, x2, y2):
        self.__x1 = x1
        self.__y1 = y1
        self.__x2 = x2
        self.__y2 = y2

    def set_x1(self, x1):
        self.__x1 = x1

    def set_y1(self, y1):
        self.__y1 = y1

    def set_x2(self, x2):
        self.__x2 = x2

    def set_y2(self, y2):
        self.__y2 = y2

    def get_cr_point(self, x1, y1):
        self.__x1 = 0
        self.__y1 = 0
        return turtle.goto(x1, y1)

    def get_dis_m(self):
        a_m = self.__x1 - self.__x2
        b_m = self.__y1 - self.__y2
        return (pow(a_m, 2) + pow(b_m, 2)) ** 0.5

    def is_near_by(self):
        a = point_class(self.__x1, self.__y1, self.__x2, self.__y2)
        if a.get_dis_m() <= 5:
            print("The two points area near each other")
        else:
            print("The two points area not near each other")

    def __str__(self):
        return x_1, y_1


x_1, y_1, x_2, y_2 = 2.1, 2.3, 19.1, 19.2
a1 = point_class(x_1, y_1, x_2, y_2).get_dis_m()
point_class(x_1, y_1, x_2, y_2).is_near_by()
a2 = point_class(x_1, y_1, x_2, y_2).__str__()
print(a1)
print("str",type(a2),"is",a2)

end