Python装饰器用法实例分析
本文实例讲述了Python装饰器用法。分享给大家供大家参考，具体如下：
无参数的装饰器
#coding=utf-8 deflog(func): defwrapper(): print'beforecalling',func.__name__ func() print'endcalling',func.__name__ returnwrapper @log defhello(): print'hello' @log defhello2(name): print'hello',name if__name__=='__main__': hello()
运行结果：
beforecalling hello
hello
endcalling hello
带参数的装饰器:
#coding=utf-8
deflog(func):
defwrapper(name):
print'beforecalling',func.__name__
func(name)
print'endcalling',func.__name__
returnwrapper
@log
defhello(name):
print'hello',name
@log
defhello2(name):
print'hello',name
if__name__=='__main__':
hello('haha')
运行结果：
beforecalling hello
hellohaha
endcalling hello
多个参数的时候:
#coding=utf-8
deflog(func):
'''
*无名字的参数
**有名字的参数
:paramfunc:
:return:
'''
defwrapper(*args,**kvargs):
print'beforecalling',func.__name__
print'args',args,'kvargs',kvargs
func(*args,**kvargs)
print'endcalling',func.__name__
returnwrapper
@log
defhello(name,age):
print'hello',name,age
@log
defhello2(name):
print'hello',name
if__name__=='__main__':
hello('haha',2)
hello(name='hehe',age=3)
输出:
endcalling hello
beforecalling hello
args()kvargs{'age':3,'name':'hehe'}
hellohehe3
endcalling hello
装饰器里带参数的情况
本质就是嵌套函数
#coding=utf-8
deflog(level,*args,**kvargs):
definner(func):
defwrapper(*args,**kvargs):
printlevel,'beforecalling',func.__name__
printlevel,'args',args,'kvargs',kvargs
func(*args,**kvargs)
printlevel,'endcalling',func.__name__
returnwrapper
returninner
@log(level='INFO')
defhello(name,age):
print'hello',name,age
@log
defhello2(name):
print'hello',name
if__name__=='__main__':
hello('haha',2)
运行输出：
INFObeforecalling hello
INFOargs('haha',2)kvargs{}
hellohaha2
INFOendcalling hello
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希望本文所述对大家Python程序设计有所帮助。