Python购物车的实现课程

需求：

1.用户输入工资收入

2.打印商品列表

3.用户选择商品，不断的加入购物车

4.检测用户余额，直接捐款，不足提示余额不足

5.允许主动退出，退出时，打印已购商品列表

重点方法：

打印列表下标的方法：

a=['alex','sys','root','admin']

>>> for index,i in enumerate(a):
...     print(index,i)

0 alex
1 sys
2 root
3 admin

 #!/usr/bin/env python3
 # -*-conding:utf-8-**
 # __Author__:'liudong'
 salary=input("Input your salary:")
 if salary.isdigit():
     salary=int(salary)
 else:
     exit("Invalid data type...")
 welcom_msg='Welcome to Shopping mall'.center(50,'-')
 print(welcom_msg)
 exit_flag=False
 product_list = [
     ('Iphone',5000),
     ('Mac Air',8000),
     ('Mac Pro',9000),
     ('XiaoMi',20),
     ('Coffe',30),
     ('Bike',800),
     ('Cloth',200)
 ]
 shop_car = []
 while not exit_flag:
     #for product_item in product_list:
     #    p_name,p_price = product_item  #可选的写法
     print("Products list".center(50,'-'))
     # for p_name,p_price in product_list:
         # print(p_name,p_price)         #由于此方法后面打印下标时，会变成2个无组，所以用下面的方法打印
     for item in enumerate(product_list):
         index=item[0]
         p_name=item[1][0]
         p_price=item[1][1]
         print(index,'.',p_name,p_price)
     user_choice = input('[q=quit,c=check]What do you want to buy?:')
     if user_choice.isdigit():   #肯定是选商品
         user_choice = int(user_choice)
         if user_choice < len(product_list):
             p_item = product_list[user_choice]
             if p_item[1] <= salary: #买的起
                 shop_car.append(p_item) #放入购物车
                 salary -= p_item[1] #扣钱
                 print('Added [%s] into your shop car,your current balance is \033[31;1m[%s]\033[0m' %
                   (p_item,salary))   ＃字体加颜色
             else:
                 print('Your balance is [%s],cannot afford this product..' %salary)
     else:
         if user_choice == 'q' or user_choice == 'quit':
             print('purchased products as blew:'.center(40,'*'))
             for item in shop_car:
                 print(item)
             print('END'.center(40,'*'))
             print('Your balance is [%s]' %salary)
             print('bye.')
             exit_flag = True
         elif user_choice == 'c' or user_choice == 'check':
             print('purchased products as blew:'.center(40, '*'))
             for item in shop_car:
                 print(item)
             print('Your balance is \033[41;1m[%s]\033[0m' % salary) #背景加颜色

编程的思维还要加强。。。。。