input: Write a function to take as input two arrays of integers and swap their elements. 
  
  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):
      for i in range(len(arr1)):
          arr1[i], arr2[i] = arr2[i], arr1[i]