Python in _, __, __foo__ differences and usage scenarios

Single Underline

1. Features with a single underline are not imported by the From module import *.
2. A single underline is a convention used by Python programmers when using classes, indicating that programmers do not want users of the class to have direct access to properties. It's just a pact! In fact, the instance. _ variable can be accessed.

Double Underline

1. Prevent quilt cover.

Double underline before and after

1. For Python internal use, such as __init__ new str .

Python in _, __, __foo__ differences and usage scenarios