Can anyone plz elaborate how this code works line by line or just generalise the 6th line

Question

Please write the 6th in general form
https://code.sololearn.com/cfGvTBet5HfX/?ref=app

num = int(input())
a = 0
b = 1
while a <= num: #10
print(a)
a,b = b,a+b

Answer 1

Line 6 could be rewritten like this:

c = a + b
a = b
b = c

Answer 2

Line 6 as it is saves us one variable (c)

It assigns the inital b to a and the initial a+b to b in the same line

Answer 3

Hey Lisa i really appreciate your help and its working but i failed to understand the reason behind it.It'd would be really nice of u to please explain the changes. :(:

Answer 4

Nevermind i understood and really thanks for the help