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7.16

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Mc麦子_专炸潘多拉

#1 Created at ... [Delete] [Delete and Lock User] 
# -*- coding: utf-8 -*-
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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