make 2 arrays then put them both in another array

def add(a, b):
  return a + b

def arrays(array1, array2):
  return [array1, array2]

def put_arrays_in_array(array1, array2):
  return arrays(array1, array2)

put_arrays_in_array([1, 2, 3], [4, 5, 6])