购物车作业

#!/usr/bin/evn python
# -*- coding:utf-8 -*-
# Author: Aron
import sys
commodity = '''
1.苹果 200
2.橘子 350
3.香蕉 500
4.水蜜桃 750
5.罗明 2000
'''
ShoppingCart = []
wages = int(input("你的工资:"))
while True:
    print(commodity)
    s1 = input("想购买的商品序号:")
    if s1 == '1':
        ShoppingCart.append(['苹果','200'])
        continue
    elif s1 == '2':
        ShoppingCart.append(['橘子','350'])
        continue
    elif s1 == '3':
        ShoppingCart.append(['香蕉','500'])
        continue
    elif s1 == '4':
        ShoppingCart.append(['水蜜桃','750'])
        continue
    elif s1 == '5':
        ShoppingCart.append(['罗明','2000'])
        continue
    elif s1 == 'Q':
        commodity1 = []
        for i in list(ShoppingCart):
            for i1 in list(i[::2]):
                commodity1.append(i1)
        for n in list(ShoppingCart):
            for n1 in list(n[1:2]):
                n1 = int(n1)
                wages = wages - n1
            for n in list(ShoppingCart):
                for n1 in list(n[1:2]):
                    n1 = int(n1)
                    wages = wages - n1
        if wages < 0:
            wages = input("你的余额已经不足,请重新选购。请重新输入工资:")
            ShoppingCart = [ ]
            continue
        else:
            print("你够买的商品为:",list(commodity1))
            print("你的余额为:%s" % wages)
            sys.exit()
    else:
        print("输入错误,请重新输入:")
        continue



学习完成列表以后：

#!/usr/bin/evn python
# -*- coding:utf-8 -*-
# Author: Roc wings

product_list = [
    ('Iphone',5800),
    ('Mac Pro',9800),
    ('Bike',800),
    ('Watch',10600),
    ('Cpffee',31),
    ('Alex Python',100)
]
shopping_list = []
salary = input("Input your salary:")
if salary.isdigit(): #如果是一个整数
    salary = int(salary)
    while True:
        for index,item in enumerate(product_list): #for item in product_list:
            print(index,item)#print(product_list.index(item),item)
        user_choice = input("请选择购买商品>>>:")
        if user_choice.isdigit():
            user_choice = int(user_choice)
            if user_choice < len(product_list) and user_choice >= 0:
                p_time = product_list[user_choice]
                if p_time[1] <= salary:#买得起
                    shopping_list.append(p_time)
                    salary -= p_time[1]
                    print("Added %s into shopping,your current balance is \033[31;1m%s\033[0m" %(p_time,salary))
                else:
                    print("\033[41;1m你的余额只剩[%s]啦，还买什么呢?\033[310m")
            else:
                print("商品[%s]不存在"% user_choice)
        elif user_choice == 'q':
            print("--------shopping list --------------")
            for p in shopping_list:
                print(p)
            print("your current balance",salary)
            exit()
        else:
            print("输入错误>>>")