1. I suppose it only uses the (Native int or int64) dtype since each one would need a code path to run quickly.
2. I would describe this a a bug. I think sequences are converted to arrays and in this case the conversion is not returning a 2 element object array but expanding and then concatenation. Kevin On Sat, Apr 17, 2021, 18:56 Alan G. Isaac <alan.is...@gmail.com> wrote: > 1. Is there a technical reason for `choose` not accept a `dtype` argument? > > 2. Separately, mypy is unhappy with my 2nd argument to `choose`: > Argument 2 to "choose" has incompatible type "Tuple[int, Sequence[float]]"; > expected "Union[Union[int, float, complex, str, bytes, generic], > Sequence[Union[int, float, complex, str, bytes, generic]], > Sequence[Sequence[Any]],_SupportsArray]" > However, `choose` is happy to have e.g. `choices=(0,seq)` (and I hope it > will remain so!). > > E.g., > a = a = (0,1,1,0,0,0,1,1) #binary array > np.choose((0,range(8)) #array([0, 1, 2, 0, 0, 0, 6, 7]) > > Thanks, Alan Isaac > _______________________________________________ > NumPy-Discussion mailing list > NumPy-Discussion@python.org > https://mail.python.org/mailman/listinfo/numpy-discussion >
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