[Numpy-discussion] Proposal: add ndarray.keys() to return dtype.names
hoogendoorn.eelco at gmail.com
Tue Sep 30 07:29:08 EDT 2014
Sounds fair to me. Indeed the ducktyping argument makes sense, and I have a
hard time imagining any namespace conflicts or other confusion. Should this
attribute return none for non-structured arrays, or simply be undefined?
On Tue, Sep 30, 2014 at 12:49 PM, John Zwinck <jzwinck at gmail.com> wrote:
> I first proposed this on GitHub:
> https://github.com/numpy/numpy/issues/5134 ; jaimefrio requested that
> I bring it to this list for discussion.
> My proposal is to add a keys() method to NumPy's array class ndarray.
> The behavior would be to return self.dtype.names, i.e. the "column
> names" for a structured array (and None when dtype.names is None,
> which it is for pure numeric arrays without named columns).
> I originally proposed to add a values() method also, but I am tabling
> that for now so we needn't discuss it in this thread.
> The motivation is to enhance the ability to use duck typing with NumPy
> arrays, Python dicts, and other types like Pandas DataFrames, h5py
> Files, and more. It's a fairly common thing to want to get the "keys"
> of a container, where "keys" is understood to be a sequence of values
> one can pass to __getitem__(), and this is exactly what I'm aiming at.
> John Zwinck
> NumPy-Discussion mailing list
> NumPy-Discussion at scipy.org
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