这篇文章主要介绍了python 装饰器的使用示例，帮助大家更好的理解和使用python装饰器，感兴趣的朋友可以了解下
无参修饰 ,无参数时不需要调用
def log1(func): func() @log1 def test(): print('test:')有参修饰
def log2(func): def inner(*args, **kwargs): func(*args, **kwargs) return inner @log2 def test(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
def log3(func): @wraps(func) def inner(*args, **kwargs,): func(*args, **kwargs) return inner @log3 def test(num): print('testlog3:',num,test.__name__) test(30) #相当于log(test(30))带参数的装饰器
def log4(level): def log(func): @wraps(func) def inner(*args, **kwargs,): if level == "warn": print("%s is running" % func.__name__) func(*args, **kwargs) return inner return log @log4(level="warn") def test(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
def log(arg): if callable(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 def log3(func): @wraps(func) def inner(*args, **kwargs, ): func(*args, **kwargs) return inner return log3 else: def log4(func): @wraps(func) def inner(*args, **kwargs,): if arg == "warn": print("%s is running" % func.__name__) func(*args, **kwargs) return inner return log4 @log(arg=None) def test(num): print('testlog:', num, test.__name__) test(0)返回入参出参
def log5(func): def inner(*args, **kwargs): print('入参：',func.__name__, args, kwargs) res =func(*args, **kwargs) print('出参：',func.__name__, res) return res return inner @log5 def test(num): print('testlog5:', num, test.__name__) return num print(test(50))类装饰器
class Loging: def __init__(self,level): self.level = level def __call__(self,func): @wraps(func) def inner(*args, **kwargs): if self.level == "warn": self.notify(func) func(*args, **kwargs) return inner def notify(self,func): print ("%s is running" % func.__name__) @Loging(level="warn") def test(num): print('testLoging:', num, test.__name__) test(0)以上就是python 装饰器的使用示例的详细内容，更多关于python 装饰器的资料请关注html中文网其它相关文章！
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