my_array = [1, 1, 3, 3, 7, 6, 8, 8]

found = False

for i in range(len(my_array)):
    for j in range(len(my_array)):
        if i != j and my_array[i] == my_array[j]:
            print(my_array[i], 'esta repetido')
            break
        elif j == len(my_array) - 1 and my_array[i] != my_array [j]:
            print(my_array[i], 'no esta repetido')
            found = True
            continue
    if found:
        break