L2 = [n.lower() for n in L1 if isinstance(n,str)]
L2 = [n.lower() for n in L1 if type(n) == str]
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忆往昔念往昔往昔不复悔不当初
L2 = [n.lower() for n in L1 if isinstance(n,str)]L2 = [n.lower() for n in L1 if type(n) == str]