What is the difference between _ and __ in Python?

The difference between _ and __ in Python is: 1. [_] single leading underscore, privatized attributes and methods, class objects and subclasses can access; 2. [__] double leading underscore, Avoid naming conflicts with properties in subclasses and cannot be directly accessed externally.

The difference between _ and __ in Python is:

• xx: public variables , all objects can be accessed;

• _xx: single leading underscore, privatized properties and methods, for package name import * prohibits import, class objects and sub- The class can be accessed and called using the object._ variable name;

• __xx: Double leading underscore to avoid naming conflicts with attributes in subclasses. It cannot be directly accessed externally. Objects should be used. ._Class name__ variable name call;

• __xx__: double leading and trailing underscores, used to define the magic attributes/module methods of the class, such as: __init__, __str__, etc., which cannot be directly Call;

• #xx_: single trailing underscore to avoid conflicts with python keywords.

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