python如何访问私有变量

首先，Python 正常访问公有成员变量的方式为：

class PrivateTest:
    name = "private"


if __name__ == "__main__":
    pt = PrivateTest()
    print(pt.name)

输出结果为：

private

Python中将成员和方法私有化的方法是在成员或方法名前加两个下划线，如下：

class PrivateTest:
    __name = "private"


if __name__ == "__main__":
    pt = PrivateTest()
    print(pt.__name)

运行报错

 print(pt.__name)
AttributeError: 'PrivateTest' object has no attribute '__name'

换个方式

class PrivateTest:
    __name = "private"


if __name__ == "__main__":
    pt = PrivateTest()
    print(pt.name)

运行依然报错

 print(pt.name)
AttributeError: 'PrivateTest' object has no attribute 'name'

Python中访问私有成员变量的正确方法是：实例类。类名_变量名

class PrivateTest:
    __name = "private"


if __name__ == "__main__":
    pt = PrivateTest()
    print(pt._PrivateTest__name)

输出结果

private