L1 = ['Hello','World',18,'Apple',None] L2 = [s.lower() for s in L1 if isinstance(s,str)]
print(L2) if L2 == ['hello', 'world', 'apple']: print('测试通过!') else: print('测试失败!')
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霸下
L1 = ['Hello','World',18,'Apple',None] L2 = [s.lower() for s in L1 if isinstance(s,str)]
测试:
print(L2) if L2 == ['hello', 'world', 'apple']: print('测试通过!') else: print('测试失败!')