带参数的装饰器，多个装饰器装饰一个函数，函数的有用信息。

带参数的装饰器。import time
def timer_out(flag1):  #falg1 = flag
    def timer(f):
        def inner(*args, **kwargs):
            if flag1:
                start_time = time.time()
                time.sleep(0.3)
                ret = f(*args, **kwargs)
                end_time = time.time()
                print(‘执行效率%s‘ % (end_time-start_time))
                return ret
            else:
                ret = f(*args, **kwargs)
                return ret
        return inner
    return timer

flag = True
@timer_out(flag)  # 1,步 timer_out(flag) == timer 2，@与timer结合，变成你熟悉的装饰器 @timer
def func1():
    print(111)

@timer_out(flag)
def func2():
    print(222)

@timer_out(flag)
def func3():
    print(333)

func1()
func2()
func3()

多个装饰器装饰一个函数

def wrapper1(func): # func = f函数名
    def inner1():
        print(‘wrapper1 ,before func‘)  # 2
        func()
        print(‘wrapper1 ,after func‘)  # 4
    return inner1
def wrapper2(func):  # func = inner1
    def inner2():
        print(‘wrapper2 ,before func‘)  # 1
        func()  # inner1()
        print(‘wrapper2 ,after func‘)  # 5
    return inner2

@wrapper2  # f = wrapper2(f) 里面的f新变量 = inner1 外面的f最新变量 = inner2
@wrapper1  # f = wrapper1(f) 里面的f函数名  外面的f新变量=inner1
def f():
    print(‘in f‘)  # 3
f()  # inner2()
‘‘‘
wrapper2 ,before func
wrapper1 ,before func
in f
wrapper1 ,after func
wrapper2 ,after func
‘‘‘

函数的有用信息。

def login(username,password):
    ‘‘‘
    此函数执行了用户名和密码两个参数，完成的是登陆的功能。

    :param username:zhangyajie
    :param password:123
    :return:
    ‘‘‘
    return print(‘登陆成功‘)
print(login.__name__)
print(login.__doc__)

装饰器的有用信息

def wrapper(f):
    def inner(*args,**kwargs):
        print(f.__name__)
        print(f.__doc__)
        ret = f(*args,**kwargs)

        return ret
    return inner

@wrapper
def login(username,password):
    ‘‘‘
    此函数执行了
    :param username:
    :param password:
    :return:
    ‘‘‘
    print(‘登陆成功‘)
    return True
print(login.__name__)
print(login.__doc__)
login(1,2)

from functools import wraps
def wrapper(f):
    @wraps(f)
    def inner(*args,**kwargs):
        ‘‘‘执行函数之前‘‘‘
        ret = f(*args,**kwargs)
        ‘‘‘执行函数之后‘‘‘
        return ret
    return inner
@wrapper
def login(username,password):
    ‘‘‘
    此函数需要用户名，密码两个参数，完成的是登陆功能
    :param username: 123
    :param password: 123
    :return: True 登陆成功 false 登陆失败
    ‘‘‘

    a = 2
    c = 4
    print(‘登陆成功‘)
    return  True
print(login.__name__)
print(login.__doc__)
print(login(1,2))
for i in login.__dict__:
    print(i)

原文地址：https://www.cnblogs.com/ZJGG/p/9042956.html