Be stricter about access to generic vars from class #18100
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This behaviour was intentionally chosen in python#6418 I agree with Ivan's comment there that it's similar to how mypy allows instantiation of `type[Abstract]` -- but that's a thing that I want to explore disallowing. Let's see primer
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Diff from mypy_primer, showing the effect of this PR on open source code: prefect (https://github.com/PrefectHQ/prefect)
+ src/prefect/_internal/concurrency/services.py:237: error: Access to generic instance variables via class is ambiguous [misc]
+ src/prefect/_internal/concurrency/services.py:270: error: Access to generic instance variables via class is ambiguous [misc]
+ src/prefect/_internal/concurrency/services.py:271: error: Access to generic instance variables via class is ambiguous [misc]
+ src/prefect/_internal/concurrency/services.py:273: error: Access to generic instance variables via class is ambiguous [misc]
+ src/prefect/server/task_queue.py:48: error: Access to generic instance variables via class is ambiguous [misc]
+ src/prefect/server/task_queue.py:52: error: Access to generic instance variables via class is ambiguous [misc]
+ src/prefect/server/task_queue.py:53: error: Access to generic instance variables via class is ambiguous [misc]
+ src/prefect/server/task_queue.py:58: error: Access to generic instance variables via class is ambiguous [misc]
altair (https://github.com/vega/altair)
+ altair/utils/schemapi.py:918: error: Access to generic instance variables via class is ambiguous [misc]
+ tools/schemapi/schemapi.py:916: error: Access to generic instance variables via class is ambiguous [misc]
artigraph (https://github.com/artigraph/artigraph)
+ src/arti/internal/mappings.py:246: error: Access to generic class variables is ambiguous [misc]
+ src/arti/storage/__init__.py:90: error: Access to generic class variables is ambiguous [misc]
+ src/arti/storage/__init__.py:105: error: Access to generic class variables is ambiguous [misc]
+ src/arti/storage/__init__.py:115: error: Access to generic class variables is ambiguous [misc]
pytest (https://github.com/pytest-dev/pytest)
+ src/_pytest/capture.py:911: error: Access to generic instance variables via class is ambiguous [misc]
+ src/_pytest/capture.py:912: error: Access to generic instance variables via class is ambiguous [misc]
+ src/_pytest/capture.py:944: error: Access to generic instance variables via class is ambiguous [misc]
+ src/_pytest/capture.py:945: error: Access to generic instance variables via class is ambiguous [misc]
pandera (https://github.com/pandera-dev/pandera)
+ pandera/api/dataframe/model.py:262: error: Access to generic instance variables via class is ambiguous [misc]
- pandera/api/dataframe/model.py:264: error: Unused "type: ignore" comment [unused-ignore]
- pandera/api/dataframe/model.py:265: error: Unused "type: ignore" comment [unused-ignore]
steam.py (https://github.com/Gobot1234/steam.py)
+ steam/_gc/state.py:87: error: Access to generic instance variables via class is ambiguous [misc]
+ steam/_gc/state.py:96: error: Access to generic instance variables via class is ambiguous [misc]
+ steam/ext/commands/converters.py:239: error: Access to generic instance variables via class is ambiguous [misc]
core (https://github.com/home-assistant/core)
+ homeassistant/components/yeelight/scanner.py:53: error: Access to generic instance variables via class is ambiguous [misc]
+ homeassistant/components/yeelight/scanner.py:54: error: Access to generic instance variables via class is ambiguous [misc]
+ homeassistant/components/yeelight/scanner.py:55: error: Access to generic instance variables via class is ambiguous [misc]
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prefect is self type, altair is self type (singleton), artigraph is runtime typing i'm fine with, pytest is abstract generic class with only concrete subclasses, pandera is also fine, steam is self type, homeassistant is self type |
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This behaviour was intentionally chosen in #6418
I agree with Ivan's comment there that it's similar to how mypy allows instantiation of
type[Abstract]-- but that's a thing that I want to explore disallowing.Let's see primer!