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之前不知道可以直接加号连接list，学到了

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Jalen-7

#32 Created at ... [Delete] [Delete and Lock User] 
>>> L=[1]
>>> L
[1]
>>> L=[0]+L+[0]
>>> L
[0, 1, 0]
>>> L=[L[0]+L[1], L[1]+L[2]]
>>> L
[1, 1]
>>> L=[0]+L+[0]
>>> L
[0, 1, 1, 0]
>>> L=[L[0]+L[1], L[1]+L[2], L[2]+L[3]]
>>> L
[1, 2, 1]

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