敲啊敲

用户登录——三次锁定

dic = {
    'egon1': {'password': '123', 'count': 0},
    'egon2': {'password': '123', 'count': 0},
    'egon3': {'password': '123', 'count': 0},
}
while True:
    name = input('请输入用户姓名：')
    if not name in dic:
        print('用户姓名不存在')
        continue
    elif dic[name]['count'] > 2:
        print('用户已被锁定')
        continue
    password = input('请输入密码：')
    if password == dic[name]['password']:
        print('登录成功')
        break
    else:
        print('用户名错误')
        dic[name]['count'] += 1

存取款——基本功能

def withdraw():
    print('取款')


def trnfer():
    print('转账')


def check_balance():
    print('查询余额')


func_dic = {
    '1': ['取款', withdraw],
    '2': ['转账', trnfer],
    '3': ['查询余额', check_balance]
}
while True:
    print('0 退出')
    for k, v in func_dic.items():
        print(k, v[0])
    choice = input('请输入业务').strip()
    if choice == '0':  # 要加引号，input的是字符串
        break
    if choice in func_dic:
        func_dic[choice][1]()
    else:
        print('输入错误！')

购物车——基本功能

menu = {}
dic = {
    'apple': 10,
    'tesla': 100000,
    'mac': 3000,
    'lenovo': 30000,
    'cehkin': 10
}
while True:
    for name, price in dic.items():
        print(name, price)
    goods_name = input('请输入商品：').strip()
    if not goods_name in dic:
        print('商品不存在')
    goods_count = input('请输入购买数量：').strip()
    if not goods_count.isdigit():
        print('请输入整数')
        continue
    goods_count = int(goods_count)
    price = dic[goods_name]
    if not goods_name in menu:
        menu[goods_name] = [price, goods_count]
    else:
        menu[goods_name][1] += goods_count
    print(menu)

装饰器——模板

def outter(func):
    def wrapper(*args,**kwargs):
        pass
        res=func(*args,**kwargs)
        return res
    return wrapper

装饰器——时间模块

import time

def index():  # index=被装饰对象index函数的内存地址
    time.sleep(1)
    print('测试成功')


def timer(func):  # func=被装饰对象index函数的内存地址
    def wrapper(*args, **kwargs):
        start = time.time()
        res = func(*args, **kwargs)  # 被装饰对象index函数的内存地址（x,y,z）
        stop = time.time()
        print('测试用时为%s' % (stop - start))
        return res  # 千万不能有括号

    return wrapper#当初是全局的，所以要retrun


index = timer(index)  # timer（被装饰对象index函数的内存地址）->返回wrapper函数
res = index()  # wrapper（）

综合——装饰器＋字典，存取款基本功能

func_dic = {}


# 往空字典里传值
def outter(n, msg):
    def inner(func):
        # 添加记录
        func_dic[str(n)] = [msg, func]

    return inner


# func_dic = {
#     '1': ['提现', withdraw],
#     '2': ['转账', transfer],
#     '3': ['查询余额', check_balance]
# }

@outter('1', '提现')  # @inner->inner（withdraw）
def withdraw():
    print('提现功能')


@outter('2', '转账')
def transfer():
    print('转账功能')


@outter('3', '查询余额')
def check_balance():
    print('查询余额')


def run():
    while True:
        for k, v in func_dic.items():
            print(k, v[0])
        choice = input('请输入命令编号,输入q退出').strip()
        if choice == 'q':
            print('退出')
            break
        if choice in func_dic:
            func_dic[choice][1]()
        else:
            print('输入错误！请重新输入')


run()