Is the counter variable an object?

Question

why the notation of the point with variable node in the line 19 of this code?

https://code.sololearn.com/cm4eSK58TK1Y/?ref=app

Answer 1

"node" is just a temporary name you use while iterating

Answer 2

Álvar Moraza no, the temporary thing is the name, you're still iterating through the list

Answer 3

but, how can it have a list as attribute? if the temporary variable disappear its list also do it.