On Tue, Apr 3, 2018 at 3:45 PM, Joseph Fox-Rabinovitz < jfoxrabinov...@gmail.com> wrote:
> I recently asked a question on Stack Overflow about whether `np.array` > could raise an error if not passed a dtype parameter: > https://stackoverflow.com/q/49639414/2988730. > > Turns out it can: > > np.array([1, [2]]) > > raises `ValueError: setting an array element with a sequence.` > Surprisingly though, the following does not, and gives the expected array > with `dtype=object`: > > np.array([[1], 2]) > > Is this behavior a bug of sorts, or is there some arcane reason behind it? > It's a bug of sorts, but the creation of object arrays is weird anyway. There has been a long time semi-proposal to raise an error in these cases unless `dtype=object` is specified, and even then there is a question of where the array ends and the objects begin, nested lists of mixed sized and such. Chuck
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