在python中模拟私有变量

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

    def __private_method(self):
        print("This is a private method.")

    def public_method(self):
        self.__private_method()
        print(self.__private_var)

obj = MyClass()
obj.public_method()

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

    @property
    def private_var(self):
        return self.__private_var

    @private_var.setter
    def private_var(self, value):
        self.__private_var = value

obj = MyClass()
print(obj.private_var)  # 访问私有变量
obj.private_var = 20  # 修改私有变量的值
print(obj.private_var)