L1 = [ 'Hello', 'World', 18,'Apple', None]
L2=[ x.lower() for x in L1 if isinstance(x, str)==True]
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今天我们会在云中逃亡吗
L1 = [ 'Hello', 'World', 18,'Apple', None]
L2=[ x.lower() for x in L1 if isinstance(x, str)==True]