docs: def partition_horizontal_twice(thelist, numbers):
      """
      numbers is split on a comma to n and n2.
      Break a list into peices each peice alternating between n and n2 items long 
      ``partition_horizontal_twice(range(14), "3,4")`` gives::
      
          [[0, 1, 2],
           [3, 4, 5, 6], 
           [7, 8, 9], 
           [10, 11, 12, 13]]
      
      Clear as mud?
      """
      n, n2 = numbers.split(',')
      try:
          n = int(n)
          n2 = int(n2)
          thelist = list(thelist)
      except (ValueError, TypeError):
          return [thelist]
      newlists = []
      while thelist:
          newlists.append(thelist[:n])
          thelist = thelist[n:]
          newlists.append(thelist[:n2])
          thelist = thelist[n2:]
      return newlists