购物车程序

购物车程序流程图：

购物车程序：

product_list=[('iphone',5800),('watch',12000),('bike',800),('book',120),('coffee',31), ('tea',50)]
shopping_list=[]

while True:
    salary=input("please input your salary:")
    if salary.isdigit():
        salary=int(salary)
        while True:
            for index,item in enumerate(product_list):
                print(index,item)
            choose=input("now you can choose your wanting!")
            if choose.isdigit():
                choose=int(choose)
                if choose<len(product_list) and choose>=0:
                    p_item=product_list[choose]
                    if salary>=p_item[1]:
                        shopping_list.append(p_item)
                        salary-=p_item[1]
                        print("added %s in your shopping cart and now your balance is %s"%(p_item,salary))
                    else:
                        print("your balance is not enough! now your balance is %s"%salary)
                else:
                    print("your choice is wrong!")
            elif choose=='q':
                print("looking forward your next coming!\n"
                      "-------shoppping list------\n"
                      "now your balance is%s"%salary)
                for p_item in shopping_list:
                   print(p_item)
                exit()
            else:
                print("your choose is wrong!you can choose others!")



    else:
         print("your salary is wrong! you can input it again!")

小结：

一、“for index,item in enumerate(product_list):”enumerate--取出商品下标。

二、“\033[31;1m%s\033[0m ”：加色强调。31--红色；32--绿色；41--红底；42--绿。

三、exit（）退出

四、“.isdigit()”判断是否为数字。