问类或闭包用于Python中的简单事物怎么实现？

def constant(value):
    def _inner():
        return value
    return _inner
x = constant(5)
print(x())

class Constant():
    def __init__(self, value):
        self._value = value

    def __call__(self):
        return self._value
y = Constant(5)
print(y())