Python装饰器入门：如何区分函数装饰函数、函数装饰类、类装饰函数四种类型？

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一：函数装饰器示例pythondef wrapFun(func): def inner(a, b): print('function name:', func.__name__) r=func(a, b) return r return inner

def myadd(a, b): return a + b

print(myadd(2, 3))

二：类装饰器示例pythondef wrapClass(cls): def __init__(self, *args, **kwargs): print('class name:', cls.__name__) super().__init__(*args, **kwargs) def __call__(self, *args, **kwargs): return super().__call__(*args, **kwargs) return type(cls.__name__, (cls,), {'__init__': __init__, '__call__': __call__})

一：函数装饰函数

def wrapFun(func):
def inner(a, b):
print('function name:', func.__name__)
r = func(a, b)
return r
return inner

@wrapFun
def myadd(a, b):
return a + b

print(myadd(2, 3))

二：函数装饰类

def wrapClass(cls):
def inner(a):
print('class name:', cls.__name__)
return cls(a)
return inner

@wrapClass
class Foo():
def __init__(self, a):
self.a = a

def fun(self):
print('self.a =', self.a)


m = Foo('xiemanR')
m.fun()

三：类装饰函数

class ShowFunName():
def __init__(self, func):
self._func = func

def __call__(self, a):
print('function name:', self._func.__name__)
return self._func(a)


@ShowFunName
def Bar(a):
return a

print(Bar('xiemanR'))

四：类装饰类

class ShowClassName(object):
def __init__(self, cls):
self._cls = cls

def __call__(self, a):
print('class name:', self._cls.__name__)
return self._cls(a)


@ShowClassName
class Foobar(object):
def __init__(self, a):
self.value = a

def fun(self):
print(self.value)

a = Foobar('xiemanR')
a.fun()

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