看不懂结局

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

L1=['Hello','World',18,'Apple',None]
L2=[s.lower for s in L1 if isinstance(s,str)]
print(L2)

结果 [<built-in method lower of str object at 0x00BD5A00>,

<built-in method lower of str object at 0x00BD5A80>,

<built-in method lower of str object at 0x00C1D280>] 这是什么呀= =

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

仔细对照教程的例子：

[s.lower() for s in L]