python装饰器的4种类型：函数装饰函数、函数装饰类、类装饰函数、类装饰类[Python基础]

Z时代
2024-01-10
分类：综合

python

一：函数装饰函数

python">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

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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

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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()