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Improve return type for psycopg2 connect function (#8567)

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When a `connection_factory` argument is provided to psycopg2's `connect` function, the function's return type now matches that of the factory output class. However, if `cursor_factory` is set and has a non-`None` value and/or `connection_factory` is not set or is `None`, the return type is simply `connection`, as before.
This commit is contained in:
Joel
2022-08-20 16:34:13 -07:00
committed by GitHub
parent 19beaba9e7
commit 8715951fca
1 changed files with 15 additions and 2 deletions
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17
stubs/psycopg2/psycopg2/__init__.pyi
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@@ -1,4 +1,5 @@
from typing import Any
from collections.abc import Callable
from typing import Any, TypeVar, overload
# connection and cursor not available at runtime
from psycopg2._psycopg import (
@@ -32,6 +33,18 @@ from psycopg2._psycopg import (
threadsafety as threadsafety,
)
_T_conn = TypeVar("_T_conn", bound=connection)
@overload
def connect(dsn: str, connection_factory: Callable[..., _T_conn], cursor_factory: None = ..., **kwargs: Any) -> _T_conn: ...
@overload
def connect(
dsn: Any | None = ..., connection_factory: Any | None = ..., cursor_factory: Any | None = ..., **kwargs
dsn: str | None = ..., *, connection_factory: Callable[..., _T_conn], cursor_factory: None = ..., **kwargs: Any
) -> _T_conn: ...
@overload
def connect(
dsn: str | None = ...,
connection_factory: Callable[..., connection] | None = ...,
cursor_factory: Callable[..., cursor] | None = ...,
**kwargs: Any,
) -> connection: ...