python学习之无参装饰器作业

一：编写函数，（函数执行的时间用time.sleep(n)模拟）

import time
def my_index(x,y):

    time.sleep(3)
    print('{},{},welcome to my index page'.format(x,y)
   
    return 100

二：编写装饰器，为函数加上统计时间的功能

import time


def timmer(func):
    def wrapper(*args, **kwargs):
        start_time = time.time()
        res = func(*args, **kwargs)
        end_time = time.time()
        print('run time is {} s.'.format(end_time - start_time))

        return res

    return wrapper


@timmer
def my_index(x, y):
    time.sleep(3)
    print('{}, {}, welcome to my index.'.format(x,y))

    return 100


res = my_index('egon','tank')
print(res)

三：编写装饰器，为函数加上认证的功能

import time

def auth(func):
    def wrapper(*args,**kwargs):
        inp_name = input('请输入你的账号:').strip()
        inp_pwd = input('请输入你的密码:').strip()
        if inp_name == 'vincent' and inp_pwd == '666':
            res = func(*args,**kwargs)
            return res
        else:
            print('账号或密码错误。')
    return wrapper

@auth
def my_index(x,y):
    time.sleep(3)
    print('{}, {},welcome to my index.'.format(x,y))

    return 100

my_index('egon','tank')

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

def auth(func):
    def wrapper(*args,**kwargs):
        global login_status
        if not login_status:
            inp_name = input('请输入你的账号:').strip()
            inp_pwd = input('请输入你的密码:').strip()
            with open('db.txt','rt',encoding='utf8') as f:
                for line in f:
                    user_info = eval(line.strip())
                    if inp_name == user_info.get('name') and inp_pwd == user_info.get('password'):
                        print('登录成功。')
                        login_status = 1
                        res = func(*args,**kwargs)
                        return res
                else:
                    print('账号或密码错误，登录失败。')
                    return
        res = func(*args,**kwargs)
        return res

    return wrapper

import time

@auth
def index(x,y):
    time.sleep(3)
    print('{}, {},from index page.'.format(x,y))

    return 'return from index'

@auth
def home(name):
    time.sleep(2)
    print('{} from home page.'.format(name))

    return 'return from home'

login_status = 0
index('张三','李四')
home('王五')
index('张三','李四')

五：编写装饰器，为多个函数加上认证功能，要求登录成功一次，在超时时间内无需重复登录，超过了超时时间，则必须重新登录

def auth(func):
    def wrapper(*args,**kwargs):
        global login_status,login_time
        if not login_status:
            inp_name = input('请输入你的账号:').strip()
            inp_pwd = input('请输入你的密码:').strip()
            with open('db.txt','rt',encoding='utf8') as f:
                for line in f:
                    user_info = eval(line.strip())
                    if inp_name == user_info.get('name') and inp_pwd == user_info.get('password'):
                        print('登录成功。')
                        login_status = 1
                        login_time = time.time()
                        res = func(*args,**kwargs)
                        return res
                else:
                    print('账号或密码错误，登录失败。')
                    return
        else:
            now_time = time.time()
            if now_time - login_time <= 10:
                login_status = 1
                login_time = time.time()
                res = func(*args, **kwargs)
                return res
            else:
                login_status = 0
                inp_name = input('请输入你的账号:').strip()
                inp_pwd = input('请输入你的密码:').strip()
                with open('db.txt', 'rt', encoding='utf8') as f:
                    for line in f:
                        user_info = eval(line.strip())
                        if inp_name == user_info.get('name') and inp_pwd == user_info.get('password'):
                            print('登录成功。')
                            login_status = 1
                            login_time = time.time()
                            res = func(*args, **kwargs)
                            return res
                    else:
                        print('账号或密码错误，登录失败。')
                        return

    return wrapper

import time

@auth
def index(x,y):
    time.sleep(3)
    print('{}, {},from index page.'.format(x,y))

    return 'return from index'

@auth
def home(name):
    time.sleep(2)
    print('{} from home page.'.format(name))

    return 'return from home'

login_status = 0
login_time = None
index('张三','李四')
time.sleep(5)
home('王五')