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