好奇，你这里讲的“虚数”，是指如 100j 这样的纯虚数？还是指 12+100j这样的虚数？
【 在 vabc3 的大作中提到: 】
: python传统艺能，看个更离谱的numpy.r_：
: If slice notation is used, the syntax start:stop:step is equivalent to np.arange(start, stop, step) inside of the brackets. However, if step is an imaginary number (i.e. 100j) then its integer portion is interpreted as a number-of-points desired and the start and stop are inclusive. In other words start:stop:stepj is interpreted as np.linspace(start, stop, step, endpoint=1) inside of the brackets. After expansion of slice notation, all comma separated sequences are concatenated together.
: 第三个参数step可以是实数也可以是虚数：实数表示步长，虚数的时候去掉j表示总共要多少步。
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