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#1 Created at ... [Delete] [Delete and Lock User]

利用 list slicing 生成错位list:

li = [1]
  while True:
    yield li
    li = [1] + [x + y for x, y in zip(li[:-1], li[1:])] + [1]

#2 Created at ... [Delete] [Delete and Lock User]

我也是这么想的，在杨辉三角中每个数等于它上方两数之和。