input: Write a function to swap elements between two arrays of integers. The function should ensure that both arrays have the same length before performing the swap. If the lengths do not match, the function should raise an assertion error.
  def swap(arr1, arr2):
      assert len(arr1) == len(arr2)
      for i in range(len(arr1)):
          temp = arr1[i]
          arr1[i] = arr2[i]
          arr2[i] = temp
  assert swap([3, 5, 6, 9], [2, 4, 7, 8])==([2, 4, 7, 8], [3, 5, 6, 9])
  assert swap([1, 2, 3], [4, 5, 6])==([4, 5, 6], [1, 2, 3])
output: def swap(arr1, arr2):
      assert len(arr1) == len(arr2)
      for i in range(len(arr1)):
          temp = arr1[i]
          arr1[i] = arr2[i]
          arr2[i] = temp