@log的decorator完美实现（原创）

# -*- coding: utf-8 -*-

from functools import wraps
from inspect import isfunction

def beforecalled(*args, **kwargs):
    print('before called! {}'.format(len(args)))

    for arg in args:
        print(arg)        

def aftercalled(*args, **kwargs):
    print('after called! {}'.format(len(args)))
    for k,v in kwargs.iteritems():
        print('{0}={1}'.format(k,v))

    jclist=['-' for _ in xrange(20)]
    print(''.join(jclist))

def logdeco(*decoargs, **decokwargs):
    def decotator(func):
        @wraps(func)
        def wrapper(*funcargs, **funckwargs):
            beforecalled(*decoargs, **decokwargs)
            result = func(*funcargs, **funckwargs)
            aftercalled(*decoargs, **decokwargs)
            return result
        return wrapper
    return decotator

def log(*decoargs, **decokwargs):
    if len(decoargs)==1 and len(decokwargs)==0:
        if isfunction(decoargs[0]) or hasattr(decoargs[0],'__call__'):
            return logdeco()(decoargs[0])

    def wrappered(func):
        return logdeco(*decoargs, **decokwargs)(func)

    return wrappered

@log('lisa',50,email='lisa@xxx.com')
def testmoreparas(x,y):
    print('x*y={}'.format(x*y))

@log()
def testemptypara(x,y):
    print('x*y={}'.format(x*y))

@log
def testjustlog(x,y):
    print('x*y={}'.format(x*y))    

if __name__=='__main__':
    testmoreparas(5,6)
    testemptypara(4,5)
    testjustlog(3,4)

Python 2.7.15 (v2.7.15:ca079a3ea3, Apr 30 2018, 16:22:17) [MSC v.1500 32 bit (Intel)] on win32
Type "copyright", "credits" or "license()" for more information.
>>> 
============ RESTART: D:\pytest\logdecorator.py ============
before called! 2
lisa
50
x*y=30
after called! 2
email=lisa@xxx.com
--------------------
before called! 0
x*y=20
after called! 0
--------------------
before called! 0
x*y=12
after called! 0
--------------------
>>>