#!/usr/bin/env python3
# -*- coding:utf-8 -*-

import functools

def log(args):
    if isinstance(args,str):
        text=args
        def func1(func):
            @functools.wraps(func)
            def mk_log(*args,**kw):
                print('%s %s' % (text,func.__name__))
                func(*args,**kw)
                print('end')
            return mk_log
        return func1
    else:
        func = args
        @functools.wraps(func)
        def mk_log(*arg,**kw):
            print('begin call %s' % func.__name__)
            func(*arg,**kw)
            print('end call %s' % func.__name__)
        return mk_log

@log
def say_hello(name):
    print('hello %s' % name)

@log('use')
def say_hi(name):
    print('hi %s' % name)

say_hello('Jack')
print(say_hello.__name__)
say_hi('Jack')
print(say_hi.__name__)

执行结果：

begin call say_hello hello Jack end call say_hello say_hello use say_hi hi Jack end say_hi