Allow SupportsIndex in slice expressions #14738
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Helps with python#2410, as suggested by BvB93 in python#2410 (comment) PEP 696 will be the real solution here, since it will allow us to make slice generic
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Diff from mypy_primer, showing the effect of this PR on open source code: pandas (https://github.com/pandas-dev/pandas)
+ pandas/core/arrays/masked.py:963: error: Unused "type: ignore" comment
ibis (https://github.com/ibis-project/ibis)
- ibis/expr/datatypes/tests/test_core.py:309: error: Slice index must be an integer or None [misc]
+ ibis/expr/datatypes/tests/test_core.py:309: error: Slice index must be an integer, SupportsIndex or None [misc]
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JukkaL
approved these changes
Feb 21, 2023
| [file typing_extensions.pyi] | ||
| from typing import Protocol | ||
| class SupportsIndex(Protocol): | ||
| def __index__(self) -> int: ... |
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Optionally, also add a pythoneval test case so that we'll verify that typing_extensions is still imported in builtins/typing. Eventually all extensions might be in typing and we'll need to switch to typing.SupportsIndex.
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Helps with #2410, as suggested by BvB93 in #2410 (comment)
PEP 696 will be the real solution here, since it will allow us to make slice generic with few backward compatibility issues