input: Write a python function to generate a list of numbers from 0 to 9.
  assert generate_numbers() == [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
  assert generate_numbers() != [9, 8, 7, 6, 5, 4, 3, 2, 1, 0]
output: def generate_numbers():
      return list(range(10))