Swap the value in one line

Question

a=10 or b= 20

Answer 1

Not sure I understand the question.
Do you mean like:

a = 10
b = 20
a, b = b, a
print("a =", a) # a = 20
print("b =", b) # b = 10

Answer 2

https://www.sololearn.com/post/9223/?ref=app

variable swapping

Answer 3

a,b=b,a