L2 = [s.lower() for s in L1 if isinstance(s,str)]
-------
扩展需求结果：
# 测试: print(L2) if L2 == ['hello', 'world',18, 'apple']: print('测试通过!') else: print('测试失败!')
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金甲神将9528
L2 = [s.lower() for s in L1 if isinstance(s,str)]
-------
扩展需求结果：
# 测试:
print(L2)
if L2 == ['hello', 'world',18, 'apple']:
print('测试通过!')
else:
print('测试失败!')