def use_logging(func):
def wrapper(*args,**kwargs):
logging.warn("%s is running" % func.__name__)
return func(*args,**kwargs)
#元信息
wrapper.__doc__ = func.__doc__
wrapper.__name__ = func.__name__
return wrapper
@use_logging
def foo():
print "I am foo"
@wrap保留元信息
from functools import wraps
def use_logging(func):
@wraps(func)
def wrapper(*args,**kwargs):
logging.warn("%s is running" % func.__name__)
return func(*args,**kwargs)
#元信息
return wrapper
类（class）的装饰器
from functools import wraps
class logit(object):
def __init__(self,logfile="out.log"):
self.logfile = logfile
def __call__(self,func):
@wraps(func)
def wrapped_function(*args,**kwargs):
log_string = func.__name__ + " was called"
print(log_string)
# 打开logfile并写入
with open(self.logfile, 'a') as opened_file:
# 现在将日志打到指定的文件
opened_file.write(log_string + '\n')
# 现在，发送一个通知
self.notify()
return func(*args,**kwargs)
return wrapped_function
def notify(self):
# logit只打日志，不做别的
pass
继承装饰器
class email_logit(logit):
'''
一个logit的实现版本，可以在函数调用时发送email给管理员
'''
def __init__(self, email='admin@myproject.com', *args, **kwargs):
self.email = email
super(logit, self).__init__(*args, **kwargs)
def notify(self):
# 发送一封email到self.email
# 这里就不做实现了
pass
From:http://docs.pythontab.com/interpy/decorators/deco_class/
