comefrom: <qiyuangong>206_Reverse_Linked_List_2.py
code: def reverseList( head):
      prev, curr = None, head
      while curr is not None:
          next_temp = curr.next
          curr.next = prev
          prev = curr
          curr = next_temp
      return prev
masked: def sample_funcname ( var_0 ) :
      var_2 , var_3 = None , var_0
      while var_3 is not None :
          var_5 = var_3.next
          var_3.next = var_2
          var_2 = var_3
          var_3 = var_5
      return var_2
  