交作业--列表生成式 外加一点点问题

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#1 Created at ... [Delete] [Delete and Lock User]

L = ['Hello', 'World', 18, 'Apple', None]
x = [R.lower() for R in L if isinstance(R,str) is True ]
print(x)

输出的结果是['hello', 'world', 'apple']，虽然不会报错了，那怎么还能把18和None，保留呢？

#2 Created at ... [Delete] [Delete and Lock User]

我想要输出的结果是['hello', 'world', 18, 'apple', None]