2.3将英尺转化为米数.py

# -*- coding: utf-8 -*-
"""
Created on Sun Apr 22 16:20:42 2018

@author: MyPC
"""

def main():
    '''
    将英尺转化为米数.
    
    公式：
    一英尺等于0.305米
    '''
    
    feet = eval(input("input feet:"))
    meters = feet*0.305
    print("%.2f feet is %.4f meters :"%(feet,meters))
    
    
if __name__ == "__main__":
    main()