What is "val" and "abs" in the code, why is the output "3"

Question

a = [x - 2 for x in range (-1, 5)]
val = lambda x : x + 3
b = [val (x) for x in a]
print(abs(max(a) - max(b)))

Answer 1

val is a lambda(anonymous function). Learn more here.

https://www.sololearn.com/learn/JUMP_LINK__&&__Python__&&__JUMP_LINK/2460/

abs returns absolute value of a number.

So after running the program,
a = [-3, -2, -1, 0, 1]
b = [0, 1, 2, 3, 4], i.e. 3 added to each element of a.
So now, max(a) = 1 & max(b) = 4
1 - 4 = -3
And the absolute value of -3 is 3.

Answer 2

Thank you very much 😊