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_1 , var_2 = None , var_0
      while var_2 is not None :
          var_3 = var_2.next
          var_2.next = var_1
          var_1 = var_2
          var_2 = var_3
      return var_1
  