numpy字符串索引行为数组

I have an array of strings

我有一个字符串数组

>>> lines
array(['RL5\Stark_223', 'RL5\Stark_223', 'RL5\Stark_223', ...,
       'RL5\Stark_238', 'RL5\Stark_238', 'RL5\Stark_238'], 
      dtype='|S27')
>>> li