python 物件 class

class Polygon:

    def __init__(self,*p):

        self.p = p

    def __repr__(self):

        return perimeter()

    def __str__(self):

        return "perimeter is " + "{:>3.2f}".format(self.perimeter())

    def perimeter(self):

        p = self.p

        #計算兩點距離(X1-X2)平方+(Y1-Y2)平方，開根號

        i = len(p) - 1

        d = ((p[0][0] - p[i][0]) ** 2 + (p[0][1] - p[i][1]) ** 2) ** 0.5

        for i in range(1,len(p)):

            d += ((p[i][0] - p[i-1][0]) ** 2 + (p[i][1] - p[i-1][1]) ** 2) ** 0.5

        return d

        

        

triangle = Polygon((0,0), (3,0), (0,4))

diamond = Polygon((-1,0), (0,-1), (1,0), (0,1))

print(triangle.perimeter())

print(diamond.perimeter())

print(triangle)

print(diamond)