装饰器

def log(func):
    def wrapper(*args,**kw):
        return func(*args,**kw)
    return wrapper

@log
def run(*args,**kw):
    print args,kw
    print ‘now 2015!‘

run(‘hello python!‘)

def log(text):
    def decorator(func):
        def wrapper(*args,**kw):
            print ‘%s %s:‘ %(text,func.__name__)
            return func(*args,**kw)
        return wrapper
    return decorator

@log(‘execute‘)
def now():
    print ‘2015 now‘

now()