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