Python私有变量如何定义?Python学习教程!

老男孩IT教育 2021-04-06 14:19:28
java Python


无论你学习的是Python、Java还是其他的编程语言,相信大家都听说过私有变量,因为私有变量是编程中必不可少的。那么你知道Python私有变量如何定义吗?跟着小编往下看。

与Java和C语言用private关键字定义私有变量不同,Python是在变量前面加上双横杠(例如:__test)来标识。

Python私有变量只能在类内部使用,不被外部调用,且当变量被标记为私有后,调用时需再变量的前端插入类名,在类名前添加一个下划线,即“_ClassName__变量名”形式。

Python私有变量或方法在自身类中不能直接调用,需通过在类中定义接口,实现私有变量的引用、读取和修改。

除了Python私有变量是使用“_”定义之外,还有两种特殊变量,分别是:

1. _xx 以单下划线开头的表示的是protected类型的变量。即保护类型只能允许其本身与子类进行访问。若内部变量标示,如: 当使用“from M import”时,不会将以一个下划线开头的对象引入 。

2. __xx__定义的是特列方法。用户控制的命名空间内的变量或是属性,如init , __import__或是file 。只有当文档有说明时使用,不要自己定义这类变量。

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