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本节练习

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心灵旅者

#1 Created at ... [Delete] [Delete and Lock User] 
L2 = # -*- coding: utf-8 -*-

L1 = ['Hello', 'World', 18, 'Apple', None]
L2 = [ s.lower() for s in L1 if isinstance(s,str) ]
# 期待输出: ['hello', 'world', 'apple']
print(L2)
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