Inserting element in a list at a given posiiton without builtin functions

def ListInsert(L1, pos, elem):
    if pos > len(L1):
        raise IndexError(f"Given Position '{pos}' is par the length of the List which is just {len(L1)}")
    else:
        FHalf = L1[:pos-1]
        SHalf = L1[pos:]

        return FHalf + [elem] + SHalf

L1 = [1,2,3,4,5,6,7,8,9,0]
L2 = ListInsert(L1, 9, 32)
print("List After Changes : ", L2)