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作业打卡

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凡九朵

#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)==True ]

# 测试:

print(L2)

if L2 == ['hello', 'world', 'apple']:

    print('测试通过!')

else:

    print('测试失败!')


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