Clarify variance convention for Parameters #16302
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AlexWaygood
reviewed
Oct 20, 2023
Co-authored-by: Alex Waygood <[email protected]>
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Diff from mypy_primer, showing the effect of this PR on open source code: discord.py (https://github.com/Rapptz/discord.py)
+ discord/ext/commands/core.py:637: error: Unused "type: ignore" comment [unused-ignore]
- discord/ext/commands/core.py:639: error: Argument 1 has incompatible type "CogT"; expected Never [arg-type]
- discord/ext/commands/core.py:639: error: Argument 2 has incompatible type "Context[BotT]"; expected Never [arg-type]
- discord/ext/commands/core.py:639: error: Argument 3 has incompatible type "CommandError"; expected Never [arg-type]
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hauntsaninja
approved these changes
Oct 23, 2023
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I'll see if it gets reported again... Jukka said he'd make 1.7 release soon so may not be worth it |
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Fixes #16296
In my big refactoring I flipped the variance convention for the
Parameterstype, but I did it inconsistently in one place. After working some more with ParamSpecs, it now seems to me the original convention is easier to remember. I also now explicitly put it in the type docstring.@hauntsaninja Not 100% sure, but this may be important enough for 1.6.2.