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

L2 = [a.lower() if isinstance(a,str) else a for a in L1]

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

我怎么觉得你们都错了.... 没说要去掉18吧...

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

# 测试:
print(L2)
if L2 == ['hello', 'world', 'apple']:
    print('测试通过!')
else:
    print('测试失败!')

这个作业的测试结果，没有数字啦