List slicing

Question

a=[1,2,3,4,5,6]
print(a[1:-1])

the output is[2,3,4,5]
can anyone explain why? it is giving that output

Answer 1

remember, array start from 0, when you're passing 1 as lower bound it start at 2.
if negative value given, the lower bound would be lastindex-value, last index is 5 (because its start from 0) so its 5-1= 4, so lower bound is element number 4. which is 5.

index 0 1 2 3 4 5
value [1,2,3,4,5, 6]