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  • 金角大王——购物车程序

    学python第三天购物车程序:

    #/bin/env python3
    # _*_ utf-8 _*_
    
    List='''1. bike 800
    2. cat 90000
    3. book 100
    '''
    List_list=(("1","bike",800),("2","cat","90000"),("3","book","100"))
    count = 0
    sary=int(input("please input your sary:"))
    
    while True:
        print(List)
    #    Input = int(input("please input(按q退出):"))
        Input = input("please input(按q退出):")
    #    print(isinstance(Input,int))
        if Input == "1":
            count = count + 800
        elif Input == "2":
            count = count + 90000
        elif Input == "3":
            count = count + 100
        elif Input == "q":
            break;
    
    print("you buy things is",count)
    if sary>=count:
        Yes=input("are you sure to buy?")
        while Yes == "y":
            sary=sary-count
            print("now,your sary is",sary)
            break
    else:
        print("your sary is too small")
    

    老师的写法:

    #/bin/env python3
    # _*_ utf-8 _*_
    product_list=[
        ('Mac',9000),
        ('kindle',800),
        ('tesla',900000),
        ('python book',105),
        ('bike',2000),
    
    ]
    saving=input('please input your money:')
    shopping_car=[]
    if saving.isdigit():
        saving=int(saving)
        while True:
            #打印商品内容
            for i,v in enumerate(product_list,1):           #enumerate 会把列表加上序号,默认从0开始;这里指定了从数字1开始
                print(i,'>>>>',v)
    
             #引导用户选择商品
            choice=input('选择购买商品编号[退出:q]:')
    
            #验证输入是否合法
            if choice.isdigit():
                choice=int(choice)
                if choice>0 and choice<=len(product_list):
                    #将用户选择商品通过choice取出来
                    p_item=product_list[choice-1]
    
                    #如果钱够,用本金saving减去该商品价格,并将该商品加入购物车
                    if p_item[1]
    

    学了文件操作之后,购物车程序改进版:

    #/bin/env python3
    # _*_ utf-8 _*_
    # __author__=wjz
    # 需要在当前目录下建立sary.txt文件,内容存储为字典格式,用户名和金额。例如 {'wjz':1000,'wjk':500}
    
    import time
    
    
    shop_dict={'咖啡':22,'牛奶':5,'百岁山':4,'果珍':9,'甜点':15,'冰茶':11,'红茶':12}
    
    shop_list=list(shop_dict)
    shop_list.sort()
    shop_tuple=tuple(shop_list)
    
    
    f=open('sary.txt',"r",encoding="utf8")
    sary_json=eval(f.read().strip())
    f.close()
    username=input("please input your name:")
    sary=sary_json[username]
    print("your sary is %d now." %sary)
    
    num=0
    for i in shop_tuple:
        if num==0:
            print("shop is this:")
        num+=1
        print('---> ('+str(num)+')',i,shop_dict[i])
    
    shop_car=[]
    while True:
        user_input=input("please input your select(q for exit):".strip())
        if user_input == 'q':
            break
        elif not user_input.isnumeric():
            print("please input num")
            continue
        elif int(user_input) > len(shop_tuple) or int(user_input) <= 0 :
            print("please input right num")
            continue
        else:
            user_input=int(user_input)
            select_shop=shop_tuple[user_input-1]
            if sary >= shop_dict[select_shop]:
                sary=sary - shop_dict[select_shop]
                shop_car.append(select_shop)
                print("%s has been in shopping car. sary is %d now." % (select_shop,sary))
            else:
                print("your money is not enough.")
                time.sleep(0.1)
    
    tuple_shop_car=tuple(shop_car)
    set_shop_car=set(tuple_shop_car)
    buyd=""
    for i in set_shop_car:
        currut_row="%s: %d" %(i,tuple_shop_car.count(i))
        buyd=buyd+"
    "+currut_row
    print('''your shop car is:
    ----------%s
    ----------''' %buyd)
    
    while True:
        sure_pay=input("Are you sure to pay?[y/n]")
        if sure_pay == "y":
            sary_json[username]=sary
            f=open('sary.txt','w')
            f.write(str(sary_json))
            f.close()
            print("your sary is %d now." %sary)
            break
        elif sure_pay == "n":
            break
        else:
            print("please input your selection.")
    
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  • 原文地址:https://www.cnblogs.com/hacker001/p/10081852.html
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