在Python中返回私有对象的正确方法

class MyClass:
    def __init__(self):
        self.__private_attr = 10

    def get_private_attr(self):
        return self.__private_attr

    def set_private_attr(self, value):
        self.__private_attr = value

obj = MyClass()
print(obj.get_private_attr())  # 输出: 10
obj.set_private_attr(20)
print(obj.get_private_attr())  # 输出: 20

class MyClass:
    def __init__(self):
        self.__private_attr = 10

    @property
    def private_attr(self):
        return self.__private_attr

obj = MyClass()
print(obj.private_attr)  # 输出: 10

class MyClass:
    def __init__(self):
        self.__private_attr = 10

obj = MyClass()
print(obj._MyClass__private_attr)  # 输出: 10