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使用两个列表的办法

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创造101-6324孙笑川

#1 Created at ... [Delete] [Delete and Lock User] 
L1 = [1]
while True:
    L2 = L1[:]
    yield L2
    if len(L1) > 1:
        for x in range(1,len(L1)):
            L1[x] = L2[x-1] + L2[x]
    L1.append(1)
return 'done'
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