python装饰器

Posted 2020-08-16

示例一：

# coding=utf8

def deco(func):
　　# 参数不确定的函数
    def _deco(*args, **kwargs):
        print(‘before %s called.‘ % func.__name__)
        ret = func(*args, **kwargs)
        print(‘after %s called. result: %s‘ % (func.__name__, ret))
    return _deco

@deco
def myfunc(a, b):
    print(‘myfunc(%s, %s) called.‘ % (a, b))
    return a + b

@deco
def myfunc2(a, b, c):
    print(‘myfunc2(%s, %s, %s) called.‘ % (a, b, c))
    return a + b + c
    
myfunc(1, 2)
myfunc(3, 4)
myfunc2(1, 2, 3)
myfunc2(3, 4, 5)

 

让装饰器带参数

 

# coding=utf8

# 让装饰器带参数
def deco(arg):
    def _deco(func):
        def __deco():
            print(‘before %s called [%s].‘ % (func.__name__, arg))
            func()
            print(‘after %s called [%s].‘ % (func.__name__, arg))
        return __deco
    return _deco

@deco(‘mymodule‘)
def myfunc():
    print(‘myfunc() called.‘)

@deco(‘module2‘)
def myfunc2():
    print(‘myfunc2() called.‘)

myfunc()
myfunc2()