Anyone explain me this code

Question

I don't understand how 'For' loop work in this code
https://code.sololearn.com/c7dQJydqi7q2/?ref=app

Answer 1

Lier Ya correct Maharnab Saikia but u don't explained a[i]...

Let me explain...
a[i] or a[19] is temporary variable in last for loop as [for i in x] just like normal so it give values of list but in last it will show 18th elements two times because a[19] is already set to temporary variable

Answer 2

Lier Hope it help u to understand 😊