python 装饰器的使用示例
无参修饰,无参数时不需要调用
deflog1(func):
func()
@log1
deftest():
print('test:')
有参修饰
deflog2(func):
definner(*args,**kwargs):
func(*args,**kwargs)
returninner
@log2
deftest(num):
print('testlog2:',num,test.__name__)
test(20)#相当于log(test(20))
@wraps可以保证装饰器修饰的函数的name的值保持不变
不带参数的装饰器
deflog3(func):
@wraps(func)
definner(*args,**kwargs,):
func(*args,**kwargs)
returninner
@log3
deftest(num):
print('testlog3:',num,test.__name__)
test(30)#相当于log(test(30))
带参数的装饰器
deflog4(level):
deflog(func):
@wraps(func)
definner(*args,**kwargs,):
iflevel=="warn":
print("%sisrunning"%func.__name__)
func(*args,**kwargs)
returninner
returnlog
@log4(level="warn")
deftest(num):
print('testlog4:',num,test.__name__)
test(40)
实现带参数和不带参数的装饰器自适应
deflog(arg):
ifcallable(arg):#判断参入的参数是否是函数，不带参数的装饰器调用这个分支
deflog3(func):
@wraps(func)
definner(*args,**kwargs,):
func(*args,**kwargs)
returninner
returnlog3
else:
deflog4(func):
@wraps(func)
definner(*args,**kwargs,):
ifarg=="warn":
print("%sisrunning"%func.__name__)
func(*args,**kwargs)
returninner
returnlog4
@log(arg=None)
deftest(num):
print('testlog:',num,test.__name__)
test(0)
返回入参出参
deflog5(func):
definner(*args,**kwargs):
print('入参：',func.__name__,args,kwargs)
res=func(*args,**kwargs)
print('出参：',func.__name__,res)
returnres
returninner
@log5
deftest(num):
print('testlog5:',num,test.__name__)
returnnum
print(test(50))
类装饰器
classLoging:
def__init__(self,level):
self.level=level
def__call__(self,func):
@wraps(func)
definner(*args,**kwargs):
ifself.level=="warn":
self.notify(func)
func(*args,**kwargs)
returninner
defnotify(self,func):
print("%sisrunning"%func.__name__)
@Loging(level="warn")
deftest(num):
print('testLoging:',num,test.__name__)
test(0)
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