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这个作业比较容易，只要理解了列表生成式就好

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Zflyee

#1 Created at ... [Delete] [Delete and Lock User] 
# -*- coding: utf-8 -*-
L1 = ['Hello', 'World', 18, 'Apple', None]
L2 = [s.lower() for s in L1 if isinstance(s,str)]
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