class Cirle:
def __init__(self, r): # 初始化
self.r =
def c(self): # 计算圆的周长
PI = 3.1415
return 2 * PI * self.
def s(self): # 计算圆的面积
PI = 3.1415
return PI * self.r * self.
if __name__ == "__main__":
c1 = Cirle(4)
c = c1.c()
s = c1.s()
print("圆的周长为 ", c, "面积为 ", s)
