多层语法糖嵌套

合集 - python(54)

1.计算机基础2023-11-232.编程语言和Python语言介绍2023-11-233.八大基本数据类型2023-11-284.python语法入门变量和常量2023-11-245.python和pycharm相关补充2023-11-246.计算机五大部件补充2023-11-237.文件操作2023-12-048.编码和解码2023-12-049.字符编码2023-12-0410.基本数据类型的内置方法2023-12-0311.循坏结构2023-11-2912.流程控制2023-11-2813.基本运算符2023-11-2814.程序与用户交互2023-11-2815.迭代器2023-12-1316.闭包函数2023-12-1317.装饰器2023-12-13

18.多层语法糖嵌套2023-12-13

19.函数的参数2023-12-1120.函数的可变长参数2023-12-1121.命名关键字参数2023-12-1122.名称空间与作用域2023-12-1123.异常处理2023-12-0624.深浅拷贝问题2023-12-0625.函数的定义和调用2023-12-0626.控制文件读写内容的模式2023-12-0527.主动控制文件内指针移动2023-12-0528.文件的操作方法2023-12-0529.垃圾回收机制GC2023-12-0530.可变与不可变类型2023-12-0531.元类2024-01-1232.内置方法2024-01-1233.pickle模块2024-01-1234.单例模式2024-01-1235.方法补充issubclass和isinstance2024-01-0536.多态2024-01-0537.继承2024-01-0538.面向对象的三大特性2024-01-0539.封装2024-01-0540.内置函数2024-01-0441.面向对象2024-01-0442.logging模块2023-12-2843.subprocess模块2023-12-2844.正则2023-12-2845.datetime模块2023-12-2046.time模块2023-12-1947.绝对路径和相对路径2023-12-1948.random模块2023-12-1949.os模块2023-12-1950.hashlib模块2023-12-1951.模块与包2023-12-1952.json模块2023-12-1953.生成器2023-12-1454.三元运算符2023-12-13

收起

装饰器多层语法糖嵌套

小练习：

# # 先验证登录
# # 再验证 输入的金额 --- 符合数字 / 余额充足
#
# # 取款函数里面
# def get_balance():
#     # 校验登录
#     # 校验金额  符合数字 / 余额充足 --- 把金额通过装饰器 返回来
#     # 拿着你的金额进行提款
use_data = {'username': 'dream', 'password': '521'}
bank_data = {'dream': {'pay_pwd': '521', 'balance': 1000}}
def login_auth(func):
    def inner(*args,**kwargs):
        if use_data['username']!='dream' and  use_data['password']!='521':
            return False,f'用户名或密码错误!'
        else:
            return func(*args,**kwargs)
    return inner
def get_balance_auth(func):
    def inner(*args,**kwargs):
        if bank_data['dream']['pay_pwd'] != '521':
            return False,f'取款密码错误！'
        get_balance_input=input('请输入取款金额：').strip()
        if get_balance_input.isdigit():
            get_balance_input=int(get_balance_input)
        if 0<get_balance_input<=bank_data['dream']['balance']:
            return func(balance=get_balance_input,*args,**kwargs)
        else:
            return False,f'余额不足！'
    return inner


@login_auth
@get_balance_auth
def get_balance(*args,**kwargs):
    # print(kwargs)
    bank_data['dream']['balance']-=kwargs.get('balance')
    bank_data['dream']['balance']=bank_data['dream']['balance']
    # print(bank_data)
    return f"取款金额为{kwargs.get('balance')},还剩下{bank_data['dream']['balance']}"
print(get_balance())

有参装饰器模板

"""有参装饰器模板"""
def wrapper_func(tag):
    def wrapper(func):
        def inner(*args,**kwargs):
            #tag 表明当前需要处理的使用函数的逻辑
            #存钱--不需要校验提款密码
            #取钱--需要校验提款密码
            if tag==None:
                ...
                #正常函数内需要的逻辑
            return func(*args,**kwargs)

        return inner
    return wrapper

wrapper_func(tag=None)
def balance():
    ...

练习

• use_data = {'username': 'dream', 'password': '521'}
  bank_data = {'dream': {'pay_pwd': '521', 'balance': 1000}}
• 取款-----校验登录-----校验取款密码
• 存款------校验登录-----不需要校验密码

use_data = {'username': 'dream', 'password': '521'}
bank_data = {'dream': {'pay_pwd': '521', 'balance': 1000}}
def check_balance(tag_fun=None,tag=None):
    if tag_fun=='login':
        def login_auth(func):
            def inner(*args,**kwargs):
                if use_data['username']!='dream' and use_data['password']!='521':
                    return False,f"用户名或密码错误!"
                else:
                    return func(*args,**kwargs)
            return inner
        return login_auth
    elif tag_fun=='balance':
        def balance_auth(func):
            def inner(*args,**kwargs):
                #存款
                balance_input=input('请输入金额：')
                if not balance_input.isdigit():
                    return False, f'输入有误！'
                balance_input=int(balance_input)
                if tag!='add_balance':
                    pay_password_input=input('请输入取款密码：').strip()
                    if pay_password_input!=bank_data['dream']['pay_pwd']:
                        return False,f'取款密码有误！'
                    if balance_input>bank_data['dream']['balance']:
                        return False,f'余额不足！'
                return func(balance=balance_input,*args,**kwargs)
            return inner
        return balance_auth
@check_balance(tag_fun='login')
@check_balance(tag_fun='balance',tag='get_balance')
#取款
def get_balance(*args,**kwargs):
    bank_data['dream']['balance']-=kwargs.get('balance')
    bank_data['dream']['balance']=bank_data['dream']['balance']
    return f"取款{kwargs.get('balance')}剩余{bank_data['dream']['balance']}"
print(get_balance())
#存款
@check_balance(tag_fun='login')
@check_balance(tag_fun='balance',tag='add_balance')
def add_balance(*args,**kwargs):
    bank_data['dream']['balance'] += kwargs.get('balance')
    bank_data['dream']['balance'] = bank_data['dream']['balance']
    return f"村款{kwargs.get('balance')}剩余{bank_data['dream']['balance']}"
# print(add_balance())