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交作业，按行输出。n= 0 输出：[ ]

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孤月情风

#1 Created at ... [Delete] [Delete and Lock User] 
def triang(n):
    if n == 0:
        yield []
    else:
        L = [1]
        yield L
        for i in range(n-1):
            L = [1]+[L[n]+L[n+1] for n in range(len(L)-1)]+[1]
            yield L
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