I find pandas.IndexSlice makes a lot of operations easier to spell. As simple as it is, it's a valuable capability. Rather than every library—or a number of them anyway—creating the same 4 lines of code with a different name, it would be much nicer to have it as a class __getitem__ method, e.g. slice[...], or as an attribute of the slice object, such as slice.literal[...].
On Mon, Jul 23, 2018, 7:20 PM Stefan Behnel <stefan...@behnel.de> wrote: > Stephan Hoyer schrieb am 23.07.2018 um 18:01: > > On Mon, Jul 23, 2018 at 4:24 AM Paul Moore wrote: > > > >> I thought the reason the proposal got nowhere was because it's pretty > >> simple to define it yourself: > >> > >> >>> class SliceHelper: > >> ... def __getitem__(self, slice): > >> ... return slice > >> ... > >> >>> SH = SliceHelper() > >> >>> SH[1::3] > >> slice(1, None, 3) > >> > >> Did I miss something significant about why this wasn't sufficient? > > > > > > I think a SliceHelper class like this is a reasonable solution, but there > > would be a lot of value having it a standard place somewhere in the > > standard library (e.g., operator.subscript). > > > > Both pandas and NumPy include this helper object under different names > > (pandas.IndexSlice and numpy.index_exp / numpy.s_), but it would be > > surprising/unexpected for pandas/numpy specific helpers to show up when > not > > using one of those libraries. I do the exact same sorts of indexing > > manipulations with xarray, dask and TensorFlow. > > > > Given that this is basically a simple feature to make it easier to work > > with Python syntax (so there's no danger it will change in the future), I > > think there is a lot to be said for putting it in the standard library in > > one place so it's obvious what to use and users don't have to relearn > that > > name for this object and/or reimplement it. > > Please copy that comment into the ticket and ask for it to be reopened. > > https://bugs.python.org/issue24379 > > Stefan > > _______________________________________________ > Python-ideas mailing list > Python-ideas@python.org > https://mail.python.org/mailman/listinfo/python-ideas > Code of Conduct: http://python.org/psf/codeofconduct/ >
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