购物车

购物车

msg="""
1 注册
2 登录
3 注销
4 购物
5 购物车
6 退出
"""
prize_dict={
    '1': "商品1",
    '2': "商品2",
    '3': "商品3",
}
username_list=[]
prize_dicts={}

def username_pwd_func():
    username=input("请输入用户名:").strip()
    pwd=input("请输入密码:").strip()
    return username,pwd

def register():
    username_inp,pwd_inp=username_pwd_func()
    with open("user_info.txt",'a',encoding='utf-8') as fa:
        fa.write(f"{username_inp}:{pwd_inp}\n")
        print (f"{username_inp}注册成功")

def login():
    count=0
    while count<3:
        username, pwd = username_pwd_func()
        user_info = f"{username}:{pwd}"
        with open('user_info.txt', 'r', encoding='utf-8') as fr:
            data = fr.read().split()
            if user_info in data:
                print(f"{username}登陆成功")
                username_list.append(username)
                return
        print ("登陆失败")
        count+=1

def logout():
    if not username_list:
        print ("请首先登陆，才可以使用该功能")
        return
    username_list.clear()

def shopping():
    if not username_list:
        print ("请首先登陆，才可以使用该功能")
        return
    print (prize_dict)
    prize_choice=input("请输入你选择的商品序列号")
    if prize_choice not in prize_dict:
        print ("你输入的商品不存在")
        return
    prize=prize_dict[prize_choice]
    if prize not in prize_dicts:
        prize_dicts[prize]=1
    else:
        prize_dicts[prize]+=1
    print (prize_dicts)

def shopping_car():
    if not username_list:
        print ("先登陆，才可以使用该功能")
        return
    print(f"购物成功：{prize_dicts}")
    prize_dicts.clear()

func_dict={
    '1':register,
    '2':login,
    '3':logout,
    '4':shopping,
    '5':shopping_car,
}
print(msg)

while True:
    choice=input("请输入你的功能选择,按q退出")
    if choice=='q':
        break
    if choice not in func_dict:
        print ("你输入的功能序号有误，请确认后输入")
        continue
    func_dict[choice]()