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gh-128335: Make slice generic at runtime #128336

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6baf878
Make slice generic
Gobot1234 Dec 29, 2024
61fbf37
Add associated test
Gobot1234 Dec 29, 2024
f241643
📜🤖 Added by blurb_it.
blurb-it[bot] Dec 29, 2024
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Update Misc/NEWS.d/next/Core_and_Builtins/2024-12-29-21-33-08.gh-issu…
Gobot1234 Dec 30, 2024
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Update 2024-12-29-21-33-08.gh-issue-128334.3c5Nou.rst
Gobot1234 Dec 30, 2024
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Merge branch 'main' into patch-4
Gobot1234 Apr 18, 2025
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1 change: 1 addition & 0 deletions Lib/test/test_genericalias.py
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Expand Up @@ -101,6 +101,7 @@
class BaseTest(unittest.TestCase):
"""Test basics."""
generic_types = [type, tuple, list, dict, set, frozenset, enumerate, memoryview,
slice,
defaultdict, deque,
SequenceMatcher,
dircmp,
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Core_and_Builtins/2024-12-29-21-33-08.gh-issue-128334.3c5Nou.rst
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@@ -0,0 +1 @@
Make the :class:`slice` class subscriptable at runtime to be consistent with typing implementation.
1 change: 1 addition & 0 deletions Objects/sliceobject.c
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Expand Up @@ -569,6 +569,7 @@ PyDoc_STRVAR(reduce_doc, "Return state information for pickling.");
static PyMethodDef slice_methods[] = {
{"indices", slice_indices, METH_O, slice_indices_doc},
{"__reduce__", slice_reduce, METH_NOARGS, reduce_doc},
{"__class_getitem__", Py_GenericAlias, METH_O|METH_CLASS, "See PEP 585"},
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This docstring seems misleading, as PEP 585 doesn't mention the slice class.

(Maybe PEP 585 could refer to https://typing.readthedocs.io/en/latest/guides/modernizing.html#generics-in-the-typing-module? Right now it links to documentation for __class_getitem__ that on its own isn't a replacement for PEP 585 from a reader's perspective)

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Agreed it is maybe a little silly to be putting PEPs in these things when they aren't active docs.

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PRs to the PEPs repo improving things like this are welcome!

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@Gobot1234 Gobot1234 Dec 29, 2024 •
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Curious if @AlexWaygood / @JelleZijlstra have opinions on this. This is done in other places. I seem to have time travelled here

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I do agree that our docstrings probably also shouldn't be referencing PEPs, which are, as you both note, historical documents recording decisions that were made at one point in time rather than living documentation. But all the other __class_getitem__ docstrings say this currently, so I think it makes sense to follow suit here and change all the __class_getitem__ docstrings to something better all at once as a followup

{NULL, NULL}
};

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