How to define Python private variables? Python tutorial!

It education for old boys 2021-04-06 14:20:02
define python private variables python


No matter what you study is Python、Java Or other programming languages , I believe everyone has heard of private variables , Because private variables are essential in programming . So you know Python How to define private variables ? Follow Xiaobian and look down .

And Java and C Language use private Keywords define private variables differently ,Python It's a double bar before the variable ( for example :__test) To mark .

Python Private variables can only be used inside a class , Not called externally , And when the variable is marked private , When calling, you need to insert the class name in front of the variable , Add an underline before the class name , namely “_ClassName__ Variable name ” form .

Python Private variables or methods cannot be called directly in their own classes , You need to define the interface in the class , Implement the reference of private variables 、 Read and modify .

except Python Private variables are used “_” Beyond definition , There are also two special variables , Namely :

1. _xx What begins with a single underscore is protected Variable of type . That is, the protection type can only be accessed by itself and its subclass . If the internal variable indicates , Such as : When using “from M import” when , Objects that start with an underscore are not introduced .

2. __xx__ The definition is a special method . Variables or properties within the user controlled namespace , Such as init , __import__ or file . Use only if the document has instructions , Don't define such variables yourself .

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