L1=['Hello','World',18,'Apple',None]
L2=[x.lower() for x in L1 if isinstance(x,str)]
print(L2)
if L2 == ['hello','world','apple'] :
print('test pass')
else :
print('test failure')
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yg不嚣张
L1=['Hello','World',18,'Apple',None]
L2=[x.lower() for x in L1 if isinstance(x,str)]
print(L2)
if L2 == ['hello','world','apple'] :
print('test pass')
else :
print('test failure')