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