comefrom: <qiyuangong>025_Reverse_Nodes_i_ k-Group_1.py
code: def reverseList( head, end):
      pos = head.next
      last = end
      next_start = pos
      while pos != end:
          head.next = pos
          last_pos = pos
          pos = pos.next
          last_pos.next = last
          last = last_pos
      return next_start
masked: def sample_funcname ( var_0 , var_1 ) :
      var_3 = var_0.next
      var_4 = var_1
      var_5 = var_3
      while var_3 != var_1 :
          var_0.next = var_3
          var_6 = var_3
          var_3 = var_3.next
          var_6.next = var_4
          var_4 = var_6
      return var_5
  