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Cedric_真的要减肥了

#1 Created at ... [Delete] [Delete and Lock User] 
L1 = ['Hello', 'World', 18, 'Apple', None]
L2 = []
for s in L1:

    if isinstance(s,str) is True:
        s = s.lower()
        L2.append(s)

    else:
        pass

print(L2)

Cedric_真的要减肥了

#2 Created at ... [Delete] [Delete and Lock User] 
L1 = ['Hello', 'World', 18, 'Apple', None]
L2 = []

L2 = [s.lower() for s in L1 if isinstance(s,str)]
print(L2)
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