def triangles(): b=[1] while(True): yield b b=[1]+[x+b[i+1] for i,x in enumerate(b[:-1])]+[1]
用了切片，貌似要复制一遍，有多余的开销，最好貌似还是楼上这种：
b = [b[x]+b[x+1] for x in range(len(b)-1)]
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用了切片，貌似要复制一遍，有多余的开销，最好貌似还是楼上这种：