7-day7-闭包函数-装饰器-函数2

装饰器

import time
import random


# def timmer(func):
#     def wrapper():
#         start_time = time.time()
#         func()
#         stop_time = time.time()
#     return wrapper
#
# def index():
#     time.sleep(random.randrange(1,3))
#     print('实现功能')
#
# def index():
#     time.sleep(random.randrange(1, 3))
#     print('实现功能i')
#
#
# def home():
#     time.sleep(random.randrange(1, 3))
#     print('实现功能h')
#
#
# index = timmer(index)
# index = timmer(home)


def timmer(func):
    def wrapper():
        start_time = time.time()
        func()
        stop_time = time.time()
    return wrapper


@timmer  # index = timmer(index) 装饰器？？ 相当于把下列函数的函数名作为实参传递给timmer函数的形参
def index():
    time.sleep(random.randrange(1,3))
    print('实现功能i')

@timmer #index = timmer(home)
def home():
    time.sleep(random.randrange(1,3))
    print('实现功能h')

index()
home()

装饰器：

 

# 一：编写函数，（函数执行的时间是随机的）

# import time
# import random
#
# @timmer
# def func1():
#     time.sleep(random.randrange(1, 3))
#     print('执行函数成功')

# 二：编写装饰器，为函数加上统计时间的功能

import time
import random

def timmer(func):
    def wrapper():
        start_time = time.time()
        func()
        stop_time = time.time()
        print('函数执行时间 %d' % (stop_time-start_time))
    return wrapper

@timmer
def func1():
    time.sleep(random.randrange(1, 3))
    print('执行函数成功')

func1()


# 三：编写装饰器，为函数加上认证的功能
import time
import random


def auth(func):
    def wrapper():
        username = input('Please input your name: ')
        password = input('Please input your password')
        if username == 'cx2c' and password == 'cx2c':
            func()
        else:
            print('Wrong username or password')
    return wrapper


@auth
def func2():
    time.sleep(random.randrange(1, 3))
    print('Congratulations to process successfully')

func2()


四：编写装饰器，为多个函数加上认证的功能（用户的账号密码来源于文件），要求登录成功一次，后续的函数都无需再输入用户名和密码
    注意：从文件中读出字符串形式的字典，可以用eval('{"name":"egon","password":"123"}')转成字典格式

装饰器：
为多个函数加上认证功能
        用户名 密码来源于文件
认证一次，后面都可以执行

tag = False


def auth(func):
    def login():
        global tag
        if tag:
            func()
        else:
            x = []
            with open('user-password.txt', 'r') as f:
                username = input('user: ')
                password = input('pass: ')
                for i in f:
                    x.append(eval(i))
                for dict_login in x:
                    if dict_login['username'] == username and dict_login['password'] == password:
                        func()
                        tag = True
                    else:
                        continue

    return login


@auth
def shooping_cart():
    print('shopping successful')


@auth
def buy_vip():
    print('buy vip successful')


@auth
def book_tickets():
    print('booking ticket successfully')


shooping_cart()
buy_vip()
book_tickets()



def auth(func):
    def login():
        x = []
        with open('user-password.txt', 'r') as f:
            username = input('user: ')
            password = input('pass: ')
            for i in f:
                x.append(eval(i))
            for dict_login in x:
                if dict_login['username'] == username and dict_login['password'] == password:
                    func()

    return login


@auth
def shooping_cart():
    print('shopping successful')


@auth
def buy_vip():
    print('buy vip successful')


@auth
def book_tickets():
    print('booking ticket successfully')


shooping_cart()
buy_vip()
book_tickets()


# 五：编写下载网页内容的函数，要求功能是：用户传入一个url，函数返回下载页面的结果

from urllib.request import urlopen
# print(urlopen('http://www.baidu.com').read())

def index(url):
    print(type(url))
    def get():
        print(urlopen(url).read())
    return get

url_input = input('Please input your url')
index(url_input)()

# 六：为题目五编写装饰器，实现缓存网页内容的功能：
#     具体：实现下载的页面存放于文件中，如果文件内有值（文件大小不为0），就优先从文件中读取网页内容，否则，就去下载，然后存到文件中

from urllib.request import urlopen

def cache_index(fun):
    def wrapper():
        with open('index.html', 'r', encoding='utf-8') as f:
            if len(f.read()) == 0:
#                with open('index.html', 'w', encoding='utf-8') as ff:
                ff.write(str(fun()))
    return wrapper

@cache_index
def get_index():
    url_input = input('Please inout your url')
    dd = urlopen(url_input).read()
    return dd

get_index()


# 七：还记得我们用函数对象的概念，制作一个函数字典的操作吗，来来来，我们有更高大上的做法，在文件开头声明一个空字典，然后在每个函数前加上装饰器，完成自动添加到字典的操作



dict_1 = {}


def add_dict(fun):
    def wrapper():
        dict_1[fun.__name__] = fun
        print(dict_1)

    return wrapper


@add_dict
def shooping_cart():
    print('shopping successful')


print(shooping_cart)


@add_dict
def buy_vip():
    print('buy vip successful')


@add_dict
def book_tickets():
    print('booking ticket successfully')


shooping_cart()
buy_vip()
book_tickets()

闭包函数

 

# 闭包函数： 闭 + 包 包了一层作用域关系 :变量不是局部就不是闭包函数
# 闭包函数： 自带作用域;延迟计算  closures
# 函数的作用域关系，在函数定义阶段已经定义


def func1():
    name = 'alex'

    def func2():
        print(name)
    return func2

aa = func1()
print(aa)

aa()


# __closure__ 关闭 用法？

money = 1000
def func1():
    x = 100
    def func2():
        print(x)
    return func2

f = func1()
print(f)
f()


def first():
    name = 'egon'
    def second():
        money = 1000
        print(egon,money)
    return second
return first