python 的@操作符 Decorator 的用法

def log(text):

def decorator(func):

def wra(*args, **kw):

print (text)

return func(*args, **kw)

return wra

return decorator

@log('2016-05-101111111111')

def now():

print ('2016-05-11')

now()  # 相当于执行 now = log('2016-05-10')(now)