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先取正确数列，再变小写

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诸葛大大大大大大大大大大大大仙

#1 Created at ... [Delete] [Delete and Lock User]

L2 = [s.lower() for s in [x for x in L1 if isinstance(x, str)]]

先用isinstance生成一个不包含数字和None的list，然后再对这个list进行小写变化

乃木坂骑

#2 Created at ... [Delete] [Delete and Lock User]

可以一步完成：

L2 = [s.lower() for s in L1 if isinstance(s, str)]
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