python 装饰器

# -*- coding: utf-8 -*-
"""
Created on Tue Apr 25 15:27:15 2017

@author: buyizhiyou
"""


'''
不带参数的装饰器,装饰器在原函数基础上加上了一些额外的功能

'''
def log(fun):
    def wrapper(*args,**kw):
        print('call %s () ' % fun.__name__)
        return fun(*args,**kw)
    return wrapper
    
    
@log  
def hello():
    print("hello world") 


hello()

'''
带参数的装饰器
'''
def log2(text):
    def dec(fun):
        def wrapper(*args,**kw):
            print('%s %s()'%(text,fun.__name__))
            return fun(*args,**kw)
        return wrapper
    return dec
    
@log2('excute')
def hello():
    print("hello world")
    
hello()