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作业

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屾屾丶

#1 Created at ... [Delete] [Delete and Lock User]
L1=['Hello','World',18,'Apple',None]
L2=[]
for x in L1:
    if isinstance(x,str):
        x=x.lower()
        L2.append(x)
    else:
        pass
print(L2)
L1=['Hello','World',18,'Apple',None]
L2=[s.lower() for s in L1 if isinstance(s,str)]
print(L2)

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