when do use underscores when coding in Python?

Answer 1

for private members

Answer 2

You can't access to it from outside the class

Answer 3

https://hackernoon.com/understanding-the-underscore-of-JUMP_LINK__&&__python__&&__JUMP_LINK-309d1a029edc

Answer 4

thanks David

Answer 5

What are private members?....

Answer 6

thanx Toni..:-)