import math #导入math模块，使用pi常量

def caculate_area(i): # 定义一个就算面积的公式 area = math.piii print('半径%.2f的面积为%.2f'%(i,area))

inputNum = int(input('请输入要计算的个数：'))

ratioList = [] for x in range(inputNum): ratio = float(input('请输入第%d个半径：'%(x+1))) ratioList.append(ratio)

for ratio in ratioList: caculate_area(ratio)