How does this become -20?

Question

Can someone explain the code?

def double_index(lst, index):
if index < len(lst):
return lst[index] * 2
else:
return lst

print(double_index([3, 8, -10, 12], 2))

Answer 1

lst=[3,8,-10,12]
index=2
#if index<len(lst) -> True since 2<4
return lst[index]*2
# (third element in lst) * 2 = -10*2 = -20

Answer 2

Thanks