计算器、tuple操作、dict、其他常用操作

计算器

#!/usr/bin/env python
#!--coding:utf-8 --
#!shenjie :2018/1/23 22:34
#[email protected] :shenjie
#[email protected]: 计算器.py
def add(string):
    total=0
    numbers=[]
    numbers+=string.split('+')
    for num in numbers:
        total+=int(num.strip())
    print('{0}={1}'.format(string,total))

def reduce(string):
    result=0
    numbers=[]
    numbers+=string.split('-')
    result=int(numbers[0].strip())
    numbers.pop(0)
    for num in numbers:
        result-=int(num.strip())
    print('{0}={1}'.format(string,result))

def ride(string):
    total=1
    numbers=[]
    numbers+=string.split('*')
    for num in numbers:
        total*=int(num.strip())
    print('{0}={1}'.format(string,total))

def division(string):
    result=0
    numbers=[]
    numbers+=string.split('/')
    result=int(numbers[0].strip())
    numbers.pop(0)
    for num in numbers:
        result /=int(num.strip())
    print("{0}={1}".format(string,result))

if __name__=='__main__':
    print('  ##################################################')
    print('  ###################欢迎来到计算中心##################')
    print('  ##################################################')
    print("1:  加法：a+b+c+d")
    print("2:  减法：a-b-c-d")
    print("3:  乘法：a*b*c*d")
    print("4:  除法：a/b/c/d")
    method=input("Please input num:(1/2/3/4): ")
    if method == "1":
        string=input("请输入您的表达式：")
        add(string)
    elif method == "2":
        string=input("请输入您的表达式：")
        reduce(string)
    elif method == "3":
        string=input("请输入您的表达式：")
        ride(string)
    elif method == "4":
        string=input("请输入您的表达式：")
        division(string)
    else:
        print("您输入的错误，只能输入1/2/3/4")