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皈依土豆教！

#1 Created at ... [Delete] [Delete and Lock User] 
### 练习：使列表中的字符串变为小写。使用lower()
L1 = ['Hello', 'World', 18, 'Apple', None]
L2 = [s.lower() for s in L1 if isinstance(s, str)]

#但是我认为这个答案并不够好，应该小写str同时保留int或float
L3 = [s.lower() if isinstance(s, str)=='Ture' else s for s in L1]
print(L3)

皈依土豆教！

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

拼写有误：

L3 = [s.lower() if isinstance(s, str)==True else s for s in L1]
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