# 返回全部元素 # L2 = [s.lower() if isinstance(s, str) else s for s in L1]
L2 = [s.lower() for s in L1 if isinstance(s, str)]
print(L2)
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远离垃圾话_
# 返回全部元素
# L2 = [s.lower() if isinstance(s, str) else s for s in L1]
L2 = [s.lower() for s in L1 if isinstance(s, str)]
print(L2)