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('测试成功!')
else:
print('测试失败!')
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佳jiajia乐
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('测试成功!')
else:
print('测试失败!')