Work March 23

A: preparation of function (the time function performed by time.sleep (n) analog)

Two: write a decorator, as a function of time together with statistical functions

import time
def timmer(func):
    def wrapper(*args,**kwargs):
        start=time.time()
        res=func(*args,**kwargs)
        stop=time.time()
        print(stop - start)
        return res

Three: write a decorator, as a function of plus certified function

Four: write a decorator for multiple functions plus certified function (from the user's account password file) require a login is successful, the follow-up functions are no longer need to enter a user name and password
Note: read a string from a file the dictionary can be used eval ( '{ "name": "egon", "password": "123"}') turn into a dictionary format

Five: write a decorator for several functions plus authentication, requires a successful login, without having to repeat the login within the timeout period, exceeding the timeout, you must log in again

import time
login_user = None
login_time = None

def check_session(func):
    time_out = 4
    def wrapper(*args,**kwargs):
        global login_user,login_time
        res = func(*args,**kwargs)
        end = time.time()
        if end - login_time > time_out:
            login_user = None
            print('登陆超时')
            login_time = None
        return res
    return wrapper



def check_login(func):
    def wrapper(*args, **kwargs):
        global login_user,login_time
        if login_user:
            func(*args, **kwargs)
        else:
            ipt_account = input('输入账号：').strip()
            ipt_pwd = input('输入密码：').strip()
            with open('db.txt', mode='rt', encoding=' UTF-. 8 ' ) AS F:
                 for I in F:
                     IF [ipt_account, ipt_pwd] == i.strip ( ' \ n- ' ) .split ( ' : ' ): 
                        login_user = ipt_account
                         Print ( ' successful login, now use function ' ) 
                        login_time = time.time ()
                         BREAK 
                the else :
                     Print ( ' account name or password is incorrect, you can not use function ' )

    return wrapper


@check_session
@check_login
def func1(cmd):
    print('func1', cmd)



@check_session
@check_login
def func2(cmd):
    print('func2', cmd)


menu = {
    '1': ['func1', func1],
    '2': ['func2', func2],
    '3': ['exit', exit]
}

while True:
    for i in menu:
        print(i, menu[i][0])

    cmd = input('cmd:').strip()
    menu[cmd][1](cmd)

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