Loosen some types to avoid pain in real-life situations #4870
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Diff from mypy_primer, showing the effect of this PR on open source code: core (https://github.com/home-assistant/core.git)
- homeassistant/helpers/device_registry.py:597: error: Unsupported operand types for - ("Set[str]" and "Set[Optional[str]]") [operator]
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Hm, mypy thinks the overloads are unsafe, I will now try to tweak or ignore to make the build clean. |
srittau
approved these changes
Dec 29, 2020
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Diff from mypy_primer, showing the effect of this PR on open source code: core (https://github.com/home-assistant/core.git)
- homeassistant/helpers/device_registry.py:597: error: Unsupported operand types for - ("Set[str]" and "Set[Optional[str]]") [operator]
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For posterity / to keep things linked, set difference was strict-ified in #3886 |
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In this diff:
set.__[i]sub__()to allow typical use cases (that work at runtime). Namely, allow removingunicodefrom a set ofstr, and allow removing optional values from non-optional sets.cryptographydeserialization functions.SupportsItemsso thatdictimplements it on Python 2.About the first item, I think mypy should support the overloads on generic self-types (see https://mypy.readthedocs.io/en/stable/more_types.html#restricted-methods-in-generic-classes), but I am not sure about other type-checkers.
cc @JukkaL