a=[1,2,3]
b=[4,5]
a.extend(b)
>>>[1,2,3,4,5]#len=5
a.append(b)
>>>[1,2,3,[4,5]]#len=4
a.extend([x,x in b[:1]])
>>>[1,2,3,4]
微信扫一扫
a=[1,2,3]
b=[4,5]
a.extend(b)
>>>[1,2,3,4,5]#len=5
a.append(b)
>>>[1,2,3,[4,5]]#len=4
a.extend([x,x in b[:1]])
>>>[1,2,3,4]
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