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dataclasses.replace: fall through to typeshed sig #15962

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Merged
hauntsaninja merged 3 commits into from
Aug 29, 2023
Merged

dataclasses.replace: fall through to typeshed sig #15962

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a657d10
dataclasses.replace: fall through to typeshed sig
ikonst Aug 26, 2023
0b95f3e
move DataclassInstance to dataclasses.pyi
ikonst Aug 27, 2023
1a538d4
clarify testReplaceIsDataclass
ikonst Aug 28, 2023
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move DataclassInstance to dataclasses.pyi
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@ikonst
ikonst committed Aug 27, 2023
commit 0b95f3eaad6857d3b001d0278c8f2b40c16e11aa
2 changes: 1 addition & 1 deletion test-data/unit/check-dataclass-transform.test
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Expand Up @@ -853,7 +853,7 @@ class Person:
name: str

p = Person('John')
y = replace(p, name='Bob') # E: Argument 1 to "replace" has incompatible type "Person"; expected a dataclass
y = replace(p, name='Bob')
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@sobolevn sobolevn Aug 27, 2023

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I think that this can potentially introduce some new weak spots, but on other hand it can eventually work :)

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@ikonst ikonst Aug 27, 2023

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This is a false positive but it's due to #15974.


[typing fixtures/typing-full.pyi]
[builtins fixtures/dataclasses.pyi]
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6 changes: 1 addition & 5 deletions test-data/unit/lib-stub/_typeshed.pyi
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@@ -1,12 +1,8 @@
from dataclasses import Field
from typing import Any, ClassVar, Protocol, TypeVar, Iterable
from typing import Protocol, TypeVar, Iterable

_KT = TypeVar("_KT")
_VT_co = TypeVar("_VT_co", covariant=True)

class SupportsKeysAndGetItem(Protocol[_KT, _VT_co]):
def keys(self) -> Iterable[_KT]: pass
def __getitem__(self, __key: _KT) -> _VT_co: pass

class DataclassInstance(Protocol):
__dataclass_fields__: ClassVar[dict[str, Field[Any]]]
9 changes: 7 additions & 2 deletions test-data/unit/lib-stub/dataclasses.pyi
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@@ -1,7 +1,12 @@
from _typeshed import DataclassInstance
from typing import Any, Callable, Generic, Literal, Mapping, Optional, TypeVar, overload, Type
from typing import Any, Callable, Generic, Literal, Mapping, Optional, TypeVar, overload, Type, \
Protocol, ClassVar
from typing_extensions import TypeGuard

# DataclassInstance is in _typeshed.pyi normally, but alas we can't do the same for lib-stub
# due to test-data/unit/lib-stub/builtins.pyi not having 'tuple'.
class DataclassInstance(Protocol):
__dataclass_fields__: ClassVar[dict[str, Field[Any]]]

_T = TypeVar('_T')
_DataclassT = TypeVar("_DataclassT", bound=DataclassInstance)

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