class Cirle: def __init__(self, r): # 初始化 self.r = r def c(self): # 計算圓的周長 PI = 3.1415 return 2 * PI * self.r def s(self): # 計算圓的面積 PI = 3.1415 return PI * self.r * self.r if __name__ == "__main__": c1 = Cirle(4) c = c1.c() s = c1.s() print("圓的周長為 ", c, "面積為 ", s)
