函数装饰器

#-----函数装饰器-----

 
1、作用域：L _E_G_B
    2、高阶函数 a、函数名可以作为参数输入  b、函数名可以作为返回值
    3、闭包

def outer():
    x = 10
    def inner(): #inner是内部函数
        print(x) #外部环境的一个变量
    return inner #内部函数inner就是一个闭包
outer()()

#inner() #1、局部变量,全局变量无法调用

#-----关于闭包-----

　　闭包 = 函数 + 定义函数时的环境

#代码原则：开放封闭原则  代码书写原则(对修改封闭，对扩展开放)

#-----装饰器函数

import time

def show_time(f): #装饰器函数
    def inner():
        start = time.time()
        f()
        time.sleep(1)
        end = time.time()
        print("spend %s"% (end-start))
    return inner

@show_time
def foo():
    print('test')
#foo=show_time(foo)
foo()

@show_time
def bar():
    print('bar')
# bar = show_time(bar)
bar()

def show_time(f):
    def inner(x,y):
        start = time.time()
        f(x,y)
        time.sleep(1)
        end = time.time()
        print(end-start)
    return inner

@show_time
def add1(a,b):
    print(a+b)
add1(1,2)

#-----装饰器加参数

def logger(flag='False'):
    def show_time(f):
        def inner(*args):
            start_time = time.time()
            f(*args)
            time.sleep(1)
            end_time = time.time()
            print(end_time-start_time)
            if flag == "True":
                print('log!')
        return inner
    return show_time

@logger('True')
def add(*args):
    sum1 = 0
    for i in args:
        sum1 += i
    print(sum1)

add(1,2,4)

#-----用户信息登录验证小程序-----

#-----创建用名密码

import json

def create_user(a,b,c,d):
    d = {
        "name":a,
        "passwd":b
    }
    with open(c,"w") as f:
        json.dump(d,f)
create_user("dream","abc123","jd.json","jd_list")
create_user("rise","rise123","qq.json","qq_list")
create_user("wx","wx123","wx.json","wx_list")

#-----用户信息验证

import json

login_status = "False"
def login(auth_type):
    def verify(func):
        def inner():
            global login_status
            flag = True
            while flag:
                c_list = ['jd','qq','wx']
                for i in c_list:
                    if auth_type == i.strip():
                        files = auth_type
                        u_name = input("please input %s name:" % files).strip()
                        u_passwd = input("please input %s passwd:" % files).strip()
                        with open(("%s.json") % files, "r") as f:
                            data = json.load(f)
                            name = data["name"]
                            passwd = data["passwd"]
                            if u_name == name and u_passwd == passwd:
                                login_status = "True"
                                func()
                                flag = False
            else:
                func()
        return inner
    return verify

@login("jd")
def home():
    print("welcome to home page")
home()

@login("qq")
def finance():
    print("welcome to finance page")
finance()

@login("wx")
def book():
    print("welcome to book page")
book()