# -*- coding: utf-8 -*-"""Created on Sun Apr 22 15:55:56 2018@author: MyPC"""def main():    '''    计算圆柱体的体积.        公式：    area = radius * radius * π    volume = area * length    input:radius,length      output:volume    '''    PI=3.1415926    radius, length = eval(input("input radius, length:"))    area = radius * radius * PI    volume = area * length    print("The volume is %6.2f :"%(volume))        if __name__ == "__main__":    main()