input: Write a function to swap the elements of two arrays of integers. The function should take two arrays as input and swap their elements at corresponding indices. Return nothing, just modify the arrays in place. If the lengths of the two arrays are not equal, 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
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