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练习

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Neri.

#1 Created at ... [Delete] [Delete and Lock User] 
L1=['Hello', 'World', 18, 'Apple', None]
L2=[x.lower() for x in L1 if isinstance(x,str)]

# 测试:
print(L2)
if L2 == ['hello', 'world', 'apple']:
    print('测试通过!')
else:
    print('测试失败!')
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