Make Mapping.get(default) less constrained #14347
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At the moment we say that `default` can either be the same as the value type, or anything it wants to be. Given:
```
def f(mapping: Mapping[str, str]):
reveal_type(mapping.get("x", "y"))
```
The `_T` is entirely unconstrained, and thus `str | int` is a perfectly valid type. This change makes it obviously `str | str` which collapses to `str` correctly.
This fix makes Pyrefly happier, although Pyright already seems to deal with it, but this doesn't harm Pyright.
|
Happy to iterate on the stubtest failures, but would appreciate broad feedback if this seems like the right thing to do first. |
|
Diff from mypy_primer, showing the effect of this PR on open source code: operator (https://github.com/canonical/operator)
- ops/model.py:1021: note: def [_T] get(self, str, /, default: Binding | _T) -> Binding | _T
+ ops/model.py:1021: note: def [_T] get(self, str, /, default: _T) -> Binding | _T
pydantic (https://github.com/pydantic/pydantic)
+ pydantic/_internal/_generate_schema.py:661: error: Need type annotation for "metadata" [var-annotated]
starlette (https://github.com/encode/starlette)
+ starlette/responses.py:262: error: No overload variant of "get" of "dict" matches argument types "str", "str" [call-overload]
+ starlette/responses.py:262: note: Possible overload variants:
+ starlette/responses.py:262: note: def get(self, Never, None = ..., /) -> None
+ starlette/responses.py:262: note: def get(self, Never, Never, /) -> Never
+ starlette/responses.py:262: note: def [_T] get(self, Never, _T, /) -> _T
colour (https://github.com/colour-science/colour)
+ colour/geometry/primitives.py:142: error: Incompatible types in assignment (expression has type "Any | str", variable has type "Literal['-x', '+x', '-y', '+y', '-z', '+z', 'xy', 'xz', 'yz', 'yx', 'zx', 'zy']") [assignment]
cibuildwheel (https://github.com/pypa/cibuildwheel)
+ cibuildwheel/__main__.py:268: error: Argument 2 to "get" of "Mapping" has incompatible type "Literal['']"; expected "Literal['auto', 'linux', 'macos', 'windows'] | None" [arg-type]
typeshed-stats (https://github.com/AlexWaygood/typeshed-stats)
+ src/typeshed_stats/gather.py:424: error: No overload variant of "get" of "dict" matches argument types "str", "dict[Never, Never]" [call-overload]
+ src/typeshed_stats/gather.py:424: note: Possible overload variants:
+ src/typeshed_stats/gather.py:424: note: def get(self, Never, None = ..., /) -> None
+ src/typeshed_stats/gather.py:424: note: def get(self, Never, Never, /) -> Never
+ src/typeshed_stats/gather.py:424: note: def [_T] get(self, Never, _T, /) -> _T
pyodide (https://github.com/pyodide/pyodide)
- pyodide-build/pyodide_build/xbuildenv_releases.py:220: note: def [_T] get(self, str, /, default: str | _T) -> str | _T
+ pyodide-build/pyodide_build/xbuildenv_releases.py:220: note: def [_T] get(self, str, /, default: _T) -> str | _T
freqtrade (https://github.com/freqtrade/freqtrade)
+ freqtrade/exchange/exchange.py:2692: error: Incompatible types in assignment (expression has type "dict[tuple[str, str, CandleType], DataFrame]", variable has type "dict[tuple[str, str, CandleType], Any | None]") [assignment]
+ freqtrade/exchange/exchange.py:2692: note: "dict" is invariant -- see https://mypy.readthedocs.io/en/stable/common_issues.html#variance
+ freqtrade/exchange/exchange.py:2692: note: Consider using "Mapping" instead, which is covariant in the value type
+ freqtrade/exchange/exchange.py:2695: error: Incompatible return value type (got "dict[tuple[str, str, CandleType], Any | None]", expected "dict[tuple[str, str, CandleType], DataFrame]") [return-value]
discord.py (https://github.com/Rapptz/discord.py)
+ discord/embeds.py:230: error: Argument 2 to "get" of "Mapping" has incompatible type "None"; expected "Literal['rich', 'image', 'video', 'gifv', 'article', 'link', 'poll_result']" [arg-type]
zulip (https://github.com/zulip/zulip)
+ zerver/lib/markdown/api_arguments_table_generator.py:222: error: Need type annotation for "object_values" [var-annotated]
scikit-build-core (https://github.com/scikit-build/scikit-build-core)
+ src/scikit_build_core/builder/get_requires.py:83: error: Argument 2 to "get" of "Mapping" has incompatible type "str"; expected "bool" [arg-type]
mitmproxy (https://github.com/mitmproxy/mitmproxy)
+ mitmproxy/http.py:735: error: Argument 2 to "get" of "Mapping" has incompatible type "None"; expected "str" [arg-type]
+ mitmproxy/addons/savehar.py:206: error: Unsupported target for indexed assignment ("object | Any") [index]
+ mitmproxy/addons/savehar.py:207: error: Unsupported target for indexed assignment ("object | Any") [index]
+ mitmproxy/addons/savehar.py:211: error: Unsupported target for indexed assignment ("object | Any") [index]
+ mitmproxy/addons/savehar.py:213: error: Unsupported target for indexed assignment ("object | Any") [index]
kopf (https://github.com/nolar/kopf)
+ kopf/_cogs/structs/bodies.py:239: error: No overload variant of "get" of "dict" matches argument type "str" [call-overload]
+ kopf/_cogs/structs/bodies.py:239: note: Possible overload variants:
+ kopf/_cogs/structs/bodies.py:239: note: def get(self, Never, None = ..., /) -> None
+ kopf/_cogs/structs/bodies.py:239: note: def get(self, Never, Never, /) -> Never
+ kopf/_cogs/structs/bodies.py:239: note: def [_T] get(self, Never, _T, /) -> _T
+ kopf/_cogs/structs/bodies.py:240: error: No overload variant of "get" of "dict" matches argument type "str" [call-overload]
+ kopf/_cogs/structs/bodies.py:240: note: Possible overload variants:
+ kopf/_cogs/structs/bodies.py:240: note: def get(self, Never, None = ..., /) -> None
+ kopf/_cogs/structs/bodies.py:240: note: def get(self, Never, Never, /) -> Never
+ kopf/_cogs/structs/bodies.py:240: note: def [_T] get(self, Never, _T, /) -> _T
+ kopf/_cogs/structs/bodies.py:241: error: No overload variant of "get" of "dict" matches argument type "str" [call-overload]
+ kopf/_cogs/structs/bodies.py:241: note: Possible overload variants:
+ kopf/_cogs/structs/bodies.py:241: note: def get(self, Never, None = ..., /) -> None
+ kopf/_cogs/structs/bodies.py:241: note: def get(self, Never, Never, /) -> Never
+ kopf/_cogs/structs/bodies.py:241: note: def [_T] get(self, Never, _T, /) -> _T
+ kopf/_cogs/structs/bodies.py:266: error: No overload variant of "get" of "dict" matches argument type "str" [call-overload]
+ kopf/_cogs/structs/bodies.py:266: note: Possible overload variants:
+ kopf/_cogs/structs/bodies.py:266: note: def get(self, Never, None = ..., /) -> None
+ kopf/_cogs/structs/bodies.py:266: note: def get(self, Never, Never, /) -> Never
+ kopf/_cogs/structs/bodies.py:266: note: def [_T] get(self, Never, _T, /) -> _T
+ kopf/_cogs/structs/bodies.py:267: error: No overload variant of "get" of "dict" matches argument type "str" [call-overload]
+ kopf/_cogs/structs/bodies.py:267: note: Possible overload variants:
+ kopf/_cogs/structs/bodies.py:267: note: def get(self, Never, None = ..., /) -> None
+ kopf/_cogs/structs/bodies.py:267: note: def get(self, Never, Never, /) -> Never
+ kopf/_cogs/structs/bodies.py:267: note: def [_T] get(self, Never, _T, /) -> _T
+ kopf/_cogs/structs/finalizers.py:14: error: No overload variant of "get" of "dict" matches argument types "str", "None" [call-overload]
+ kopf/_cogs/structs/finalizers.py:14: note: Possible overload variants:
+ kopf/_cogs/structs/finalizers.py:14: note: def get(self, Never, None = ..., /) -> None
+ kopf/_cogs/structs/finalizers.py:14: note: def get(self, Never, Never, /) -> Never
+ kopf/_cogs/structs/finalizers.py:14: note: def [_T] get(self, Never, _T, /) -> _T
+ kopf/_cogs/structs/finalizers.py:21: error: No overload variant of "get" of "dict" matches argument types "str", "list[Never]" [call-overload]
+ kopf/_cogs/structs/finalizers.py:21: note: Possible overload variants:
+ kopf/_cogs/structs/finalizers.py:21: note: def get(self, Never, None = ..., /) -> None
+ kopf/_cogs/structs/finalizers.py:21: note: def get(self, Never, Never, /) -> Never
+ kopf/_cogs/structs/finalizers.py:21: note: def [_T] get(self, Never, _T, /) -> _T
+ kopf/_cogs/structs/finalizers.py:32: error: No overload variant of "get" of "dict" matches argument types "str", "list[Never]" [call-overload]
+ kopf/_cogs/structs/finalizers.py:32: note: Possible overload variants:
+ kopf/_cogs/structs/finalizers.py:32: note: def get(self, Never, None = ..., /) -> None
+ kopf/_cogs/structs/finalizers.py:32: note: def get(self, Never, Never, /) -> Never
+ kopf/_cogs/structs/finalizers.py:32: note: def [_T] get(self, Never, _T, /) -> _T
+ kopf/_cogs/structs/finalizers.py:44: error: No overload variant of "get" of "dict" matches argument types "str", "list[Never]" [call-overload]
+ kopf/_cogs/structs/finalizers.py:44: note: Possible overload variants:
+ kopf/_cogs/structs/finalizers.py:44: note: def get(self, Never, None = ..., /) -> None
+ kopf/_cogs/structs/finalizers.py:44: note: def get(self, Never, Never, /) -> Never
+ kopf/_cogs/structs/finalizers.py:44: note: def [_T] get(self, Never, _T, /) -> _T
+ kopf/_cogs/configs/conventions.py:70: error: Need type annotation for "owners" [var-annotated]
+ kopf/_core/actions/loggers.py:132: error: No overload variant of "get" of "dict" matches argument type "str" [call-overload]
+ kopf/_core/actions/loggers.py:132: note: Possible overload variants:
+ kopf/_core/actions/loggers.py:132: note: def get(self, Never, None = ..., /) -> None
+ kopf/_core/actions/loggers.py:132: note: def get(self, Never, Never, /) -> Never
+ kopf/_core/actions/loggers.py:132: note: def [_T] get(self, Never, _T, /) -> _T
+ kopf/_core/actions/loggers.py:133: error: No overload variant of "get" of "dict" matches argument type "str" [call-overload]
+ kopf/_core/actions/loggers.py:133: note: Possible overload variants:
+ kopf/_core/actions/loggers.py:133: note: def get(self, Never, None = ..., /) -> None
+ kopf/_core/actions/loggers.py:133: note: def get(self, Never, Never, /) -> Never
+ kopf/_core/actions/loggers.py:133: note: def [_T] get(self, Never, _T, /) -> _T
+ kopf/_core/actions/loggers.py:134: error: No overload variant of "get" of "dict" matches argument type "str" [call-overload]
+ kopf/_core/actions/loggers.py:134: note: Possible overload variants:
+ kopf/_core/actions/loggers.py:134: note: def get(self, Never, None = ..., /) -> None
+ kopf/_core/actions/loggers.py:134: note: def get(self, Never, Never, /) -> Never
+ kopf/_core/actions/loggers.py:134: note: def [_T] get(self, Never, _T, /) -> _T
+ kopf/_core/actions/loggers.py:145: error: No overload variant of "__ror__" of "dict" matches argument type "Mapping[str, object]" [operator]
+ kopf/_core/actions/loggers.py:145: note: Possible overload variants:
+ kopf/_core/actions/loggers.py:145: note: def __ror__(self, dict[Never, Never], /) -> dict[Never, Never]
+ kopf/_core/actions/loggers.py:145: note: def [_T1, _T2] __ror__(self, dict[_T1, _T2], /) -> dict[_T1, _T2]
+ kopf/_core/actions/loggers.py:145: note: Right operand is of type "Any | dict[Never, Never]"
+ kopf/_kits/hierarchies.py:114: error: No overload variant of "get" of "dict" matches argument types "str", "dict[Never, Never]" [call-overload]
+ kopf/_kits/hierarchies.py:114: note: Possible overload variants:
+ kopf/_kits/hierarchies.py:114: note: def get(self, Never, None = ..., /) -> None
+ kopf/_kits/hierarchies.py:114: note: def get(self, Never, Never, /) -> Never
+ kopf/_kits/hierarchies.py:114: note: def [_T] get(self, Never, _T, /) -> _T
+ kopf/_kits/hierarchies.py:164: error: No overload variant of "get" of "dict" matches argument types "str", "None" [call-overload]
+ kopf/_kits/hierarchies.py:164: note: Possible overload variants:
+ kopf/_kits/hierarchies.py:164: note: def get(self, Never, None = ..., /) -> None
+ kopf/_kits/hierarchies.py:164: note: def get(self, Never, Never, /) -> Never
+ kopf/_kits/hierarchies.py:164: note: def [_T] get(self, Never, _T, /) -> _T
+ kopf/_kits/hierarchies.py:219: error: No overload variant of "get" of "dict" matches argument types "str", "None" [call-overload]
+ kopf/_kits/hierarchies.py:219: note: Possible overload variants:
+ kopf/_kits/hierarchies.py:219: note: def get(self, Never, None = ..., /) -> None
+ kopf/_kits/hierarchies.py:219: note: def get(self, Never, Never, /) -> Never
+ kopf/_kits/hierarchies.py:219: note: def [_T] get(self, Never, _T, /) -> _T
+ kopf/_kits/hierarchies.py:227: error: No overload variant of "get" of "dict" matches argument type "str" [call-overload]
+ kopf/_kits/hierarchies.py:227: note: Possible overload variants:
+ kopf/_kits/hierarchies.py:227: note: def get(self, Never, None = ..., /) -> None
+ kopf/_kits/hierarchies.py:227: note: def get(self, Never, Never, /) -> Never
+ kopf/_kits/hierarchies.py:227: note: def [_T] get(self, Never, _T, /) -> _T
+ kopf/_kits/hierarchies.py:250: error: No overload variant of "get" of "dict" matches argument types "str", "None" [call-overload]
+ kopf/_kits/hierarchies.py:250: note: Possible overload variants:
+ kopf/_kits/hierarchies.py:250: note: def get(self, Never, None = ..., /) -> None
+ kopf/_kits/hierarchies.py:250: note: def get(self, Never, Never, /) -> Never
+ kopf/_kits/hierarchies.py:250: note: def [_T] get(self, Never, _T, /) -> _T
+ kopf/_kits/hierarchies.py:251: error: No overload variant of "get" of "dict" matches argument types "str", "None" [call-overload]
+ kopf/_kits/hierarchies.py:251: note: Possible overload variants:
+ kopf/_kits/hierarchies.py:251: note: def get(self, Never, None = ..., /) -> None
+ kopf/_kits/hierarchies.py:251: note: def get(self, Never, Never, /) -> Never
+ kopf/_kits/hierarchies.py:251: note: def [_T] get(self, Never, _T, /) -> _T
+ kopf/_kits/hierarchies.py:252: error: No overload variant of "get" of "dict" matches argument types "str", "dict[Never, Never]" [call-overload]
+ kopf/_kits/hierarchies.py:252: note: Possible overload variants:
+ kopf/_kits/hierarchies.py:252: note: def get(self, Never, None = ..., /) -> None
+ kopf/_kits/hierarchies.py:252: note: def get(self, Never, Never, /) -> Never
+ kopf/_kits/hierarchies.py:252: note: def [_T] get(self, Never, _T, /) -> _T
+ kopf/_core/intents/registries.py:440: error: No overload variant of "get" of "dict" matches argument types "str", "dict[Never, Never]" [call-overload]
+ kopf/_core/intents/registries.py:440: note: Possible overload variants:
+ kopf/_core/intents/registries.py:440: note: def get(self, Never, None = ..., /) -> None
+ kopf/_core/intents/registries.py:440: note: def get(self, Never, Never, /) -> Never
+ kopf/_core/intents/registries.py:440: note: def [_T] get(self, Never, _T, /) -> _T
+ kopf/_core/intents/registries.py:451: error: No overload variant of "get" of "dict" matches argument types "str", "dict[Never, Never]" [call-overload]
+ kopf/_core/intents/registries.py:451: note: Possible overload variants:
+ kopf/_core/intents/registries.py:451: note: def get(self, Never, None = ..., /) -> None
+ kopf/_core/intents/registries.py:451: note: def get(self, Never, Never, /) -> Never
+ kopf/_core/intents/registries.py:451: note: def [_T] get(self, Never, _T, /) -> _T
+ kopf/_core/engines/indexing.py:233: error: Need type annotation for "meta" [var-annotated]
mongo-python-driver (https://github.com/mongodb/mongo-python-driver)
+ pymongo/errors.py:302: error: Need type annotation for "wces" [var-annotated]
+ pymongo/errors.py:306: error: Need type annotation for "werrs" [var-annotated]
+ pymongo/errors.py:350: error: Argument 2 to "get" of "Mapping" has incompatible type "dict[Never, Never]"; expected "list[WriteError] | None" [arg-type]
+ pymongo/auth_shared.py:114: error: Need type annotation for "properties" [var-annotated]
+ pymongo/hello.py:183: error: No overload variant of "get" of "dict" matches argument type "str" [call-overload]
+ pymongo/hello.py:183: note: Possible overload variants:
+ pymongo/hello.py:183: note: def get(self, Never, None = ..., /) -> None
+ pymongo/hello.py:183: note: def get(self, Never, Never, /) -> Never
+ pymongo/hello.py:183: note: def [_T] get(self, Never, _T, /) -> _T
+ pymongo/pool_options.py:226: error: No overload variant of "get" of "dict" matches argument type "str" [call-overload]
+ pymongo/pool_options.py:226: note: Possible overload variants:
+ pymongo/pool_options.py:226: note: def get(self, Never, None = ..., /) -> None
+ pymongo/pool_options.py:226: note: def get(self, Never, Never, /) -> Never
+ pymongo/pool_options.py:226: note: def [_T] get(self, Never, _T, /) -> _T
+ pymongo/pool_options.py:232: error: No overload variant of "get" of "dict" matches argument type "str" [call-overload]
+ pymongo/pool_options.py:232: note: Possible overload variants:
+ pymongo/pool_options.py:232: note: def get(self, Never, None = ..., /) -> None
+ pymongo/pool_options.py:232: note: def get(self, Never, Never, /) -> Never
+ pymongo/pool_options.py:232: note: def [_T] get(self, Never, _T, /) -> _T
+ pymongo/pool_options.py:256: error: Need type annotation for "driver" [var-annotated]
+ pymongo/pool_options.py:259: error: Value of type "Any | None" is not indexable [index]
+ pymongo/pool_options.py:269: error: Value of type "Any | None" is not indexable [index]
+ pymongo/client_options.py:56: error: Argument 1 to "_build_credentials_tuple" has incompatible type "Any | str | None"; expected "str" [arg-type]
+ pymongo/synchronous/collection.py:2855: error: Need type annotation for "options" [var-annotated]
+ pymongo/asynchronous/collection.py:2862: error: Need type annotation for "options" [var-annotated]
core (https://github.com/home-assistant/core)
+ homeassistant/components/hassio/backup.py:666: error: Need type annotation for "restore_errors" [var-annotated]
+ homeassistant/components/hyperion/config_flow.py:206: error: No overload variant of "get" of "dict" matches argument types "str", "Any" [call-overload]
+ homeassistant/components/hyperion/config_flow.py:206: note: Possible overload variants:
+ homeassistant/components/hyperion/config_flow.py:206: note: def get(self, Never, None = ..., /) -> None
+ homeassistant/components/hyperion/config_flow.py:206: note: def get(self, Never, Never, /) -> Never
+ homeassistant/components/hyperion/config_flow.py:206: note: def [_T] get(self, Never, _T, /) -> _T
+ homeassistant/components/onewire/sensor.py:66: error: No overload variant of "get" of "dict" matches argument types "str", "dict[Never, Never]" [call-overload]
+ homeassistant/components/onewire/sensor.py:66: note: Possible overload variants:
+ homeassistant/components/onewire/sensor.py:66: note: def get(self, Never, None = ..., /) -> None
+ homeassistant/components/onewire/sensor.py:66: note: def get(self, Never, Never, /) -> Never
+ homeassistant/components/onewire/sensor.py:66: note: def [_T] get(self, Never, _T, /) -> _T
+ homeassistant/components/denonavr/config_flow.py:273: error: Argument 2 to "get" of "Mapping" has incompatible type "str | None"; expected "str" [arg-type]
+ homeassistant/components/fritz/coordinator.py:519: error: Argument 2 to "get" of "Mapping" has incompatible type "bool"; expected "Mapping[str, Any] | None" [arg-type]
+ homeassistant/components/mobile_app/logbook.py:60: error: Incompatible return value type (got "dict[str, str | Any | None]", expected "dict[str, str]") [return-value]
steam.py (https://github.com/Gobot1234/steam.py)
- steam/ext/commands/utils.py:43: note: def [_T] get(self, str, /, default: _VT | _T) -> _VT | _T
+ steam/ext/commands/utils.py:43: note: def [_T] get(self, str, /, default: _T) -> _VT | _T
hydra-zen (https://github.com/mit-ll-responsible-ai/hydra-zen)
+ src/hydra_zen/wrapper/_implementations.py:1735: error: Argument 2 to "get" of "Mapping" has incompatible type "str | None"; expected "str" [arg-type]
spack (https://github.com/spack/spack)
+ lib/spack/spack/solver/asp.py:4747: error: Need type annotation for "default_include" [var-annotated]
+ lib/spack/spack/solver/asp.py:4748: error: Need type annotation for "default_exclude" [var-annotated]
+ lib/spack/spack/solver/asp.py:4764: error: Argument "include" to "from_environment_included_concrete" of "SpecFilter" has incompatible type "Any | str | list[Any]"; expected "list[str]" [arg-type]
+ lib/spack/spack/solver/asp.py:4765: error: Argument "exclude" to "from_environment_included_concrete" of "SpecFilter" has incompatible type "Any | str | list[Any]"; expected "list[str]" [arg-type]
black (https://github.com/psf/black)
+ src/black/__init__.py:1135:16: error: No overload variant of "get" of "dict" matches argument types "str", "dict[Never, Never]" [call-overload]
+ src/black/__init__.py:1135:16: note: Possible overload variants:
+ src/black/__init__.py:1135:16: note: def get(self, Never, None = ..., /) -> None
+ src/black/__init__.py:1135:16: note: def get(self, Never, Never, /) -> Never
+ src/black/__init__.py:1135:16: note: def [_T] get(self, Never, _T, /) -> _T
xarray (https://github.com/pydata/xarray)
+ xarray/core/indexing.py: note: In function "group_indexers_by_index":
+ xarray/core/indexing.py:141: error: Argument 2 to "get" of "Mapping" has incompatible type "None"; expected "Index" [arg-type]
+ xarray/computation/rolling.py: note: In member "_mapping_to_list" of class "Rolling":
+ xarray/computation/rolling.py:245: error: Argument 2 to "get" of "Mapping" has incompatible type "_T | None"; expected "_T" [arg-type]
|
|
Could you try a three-overload solution, like we do for Lines 1183 to 1188 in 0c155fe |
facebook-github-bot
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to facebook/pyrefly
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Jun 27, 2025
Summary: I think python/typeshed#14347 is the fix to the stdlib, have sent that upstream. Reviewed By: migeed-z Differential Revision: D77434542 fbshipit-source-id: a1f4dadebb2fdaa359577ed885d7cdd9bf7e4686
vagabond-0
pushed a commit
to vagabond-0/pyrefly
that referenced
this pull request
Jun 27, 2025
Summary: I think python/typeshed#14347 is the fix to the stdlib, have sent that upstream. Reviewed By: migeed-z Differential Revision: D77434542 fbshipit-source-id: a1f4dadebb2fdaa359577ed885d7cdd9bf7e4686
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At the moment we say that
defaultcan either be the same as the value type, or anything it wants to be. Given:The
_Tis entirely unconstrained, and thusstr | intis a perfectly valid type. This change makes it obviouslystr | strwhich collapses tostrcorrectly.This fix makes Pyrefly happier, although Pyright already seems to deal with it, but this doesn't harm Pyright.