两步骤 第一步选出string，第二部把string小写
L2 = [x for x in L1 if isinstance(x,str)]
L2 = [s.lower() for s in L2]
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两步骤 第一步选出string，第二部把string小写
L2 = [x for x in L1 if isinstance(x,str)]
L2 = [s.lower() for s in L2]