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279 lines
8.1 KiB
Python
279 lines
8.1 KiB
Python
from typing import (
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Any,
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Callable,
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Dict,
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Generic,
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List,
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Optional,
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Sequence,
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Mapping,
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Tuple,
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Type,
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TypeVar,
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Union,
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overload,
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)
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# `import X as X` is required to make these public
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from . import exceptions as exceptions
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from . import filters as filters
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from . import converters as converters
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from . import validators as validators
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from ._version_info import VersionInfo
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__version__: str
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__version_info__: VersionInfo
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__title__: str
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__description__: str
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__url__: str
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__uri__: str
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__author__: str
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__email__: str
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__license__: str
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__copyright__: str
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_T = TypeVar("_T")
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_C = TypeVar("_C", bound=type)
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_ValidatorType = Callable[[Any, Attribute[_T], _T], Any]
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_ConverterType = Callable[[Any], _T]
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_FilterType = Callable[[Attribute[_T], _T], bool]
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_ReprType = Callable[[Any], str]
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_ReprArgType = Union[bool, _ReprType]
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# FIXME: in reality, if multiple validators are passed they must be in a list or tuple,
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# but those are invariant and so would prevent subtypes of _ValidatorType from working
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# when passed in a list or tuple.
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_ValidatorArgType = Union[_ValidatorType[_T], Sequence[_ValidatorType[_T]]]
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# _make --
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NOTHING: object
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# NOTE: Factory lies about its return type to make this possible: `x: List[int] = Factory(list)`
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# Work around mypy issue #4554 in the common case by using an overload.
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@overload
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def Factory(factory: Callable[[], _T]) -> _T: ...
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@overload
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def Factory(
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factory: Union[Callable[[Any], _T], Callable[[], _T]],
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takes_self: bool = ...,
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) -> _T: ...
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class Attribute(Generic[_T]):
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name: str
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default: Optional[_T]
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validator: Optional[_ValidatorType[_T]]
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repr: _ReprArgType
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cmp: bool
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eq: bool
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order: bool
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hash: Optional[bool]
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init: bool
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converter: Optional[_ConverterType[_T]]
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metadata: Dict[Any, Any]
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type: Optional[Type[_T]]
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kw_only: bool
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# NOTE: We had several choices for the annotation to use for type arg:
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# 1) Type[_T]
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# - Pros: Handles simple cases correctly
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# - Cons: Might produce less informative errors in the case of conflicting TypeVars
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# e.g. `attr.ib(default='bad', type=int)`
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# 2) Callable[..., _T]
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# - Pros: Better error messages than #1 for conflicting TypeVars
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# - Cons: Terrible error messages for validator checks.
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# e.g. attr.ib(type=int, validator=validate_str)
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# -> error: Cannot infer function type argument
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# 3) type (and do all of the work in the mypy plugin)
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# - Pros: Simple here, and we could customize the plugin with our own errors.
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# - Cons: Would need to write mypy plugin code to handle all the cases.
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# We chose option #1.
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# `attr` lies about its return type to make the following possible:
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# attr() -> Any
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# attr(8) -> int
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# attr(validator=<some callable>) -> Whatever the callable expects.
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# This makes this type of assignments possible:
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# x: int = attr(8)
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#
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# This form catches explicit None or no default but with no other arguments returns Any.
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@overload
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def attrib(
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default: None = ...,
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validator: None = ...,
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repr: _ReprArgType = ...,
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cmp: Optional[bool] = ...,
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hash: Optional[bool] = ...,
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init: bool = ...,
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metadata: Optional[Mapping[Any, Any]] = ...,
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type: None = ...,
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converter: None = ...,
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factory: None = ...,
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kw_only: bool = ...,
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eq: Optional[bool] = ...,
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order: Optional[bool] = ...,
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) -> Any: ...
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# This form catches an explicit None or no default and infers the type from the other arguments.
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@overload
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def attrib(
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default: None = ...,
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validator: Optional[_ValidatorArgType[_T]] = ...,
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repr: _ReprArgType = ...,
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cmp: Optional[bool] = ...,
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hash: Optional[bool] = ...,
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init: bool = ...,
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metadata: Optional[Mapping[Any, Any]] = ...,
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type: Optional[Type[_T]] = ...,
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converter: Optional[_ConverterType[_T]] = ...,
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factory: Optional[Callable[[], _T]] = ...,
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kw_only: bool = ...,
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eq: Optional[bool] = ...,
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order: Optional[bool] = ...,
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) -> _T: ...
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# This form catches an explicit default argument.
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@overload
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def attrib(
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default: _T,
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validator: Optional[_ValidatorArgType[_T]] = ...,
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repr: _ReprArgType = ...,
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cmp: Optional[bool] = ...,
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hash: Optional[bool] = ...,
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init: bool = ...,
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metadata: Optional[Mapping[Any, Any]] = ...,
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type: Optional[Type[_T]] = ...,
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converter: Optional[_ConverterType[_T]] = ...,
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factory: Optional[Callable[[], _T]] = ...,
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kw_only: bool = ...,
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eq: Optional[bool] = ...,
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order: Optional[bool] = ...,
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) -> _T: ...
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# This form covers type=non-Type: e.g. forward references (str), Any
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@overload
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def attrib(
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default: Optional[_T] = ...,
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validator: Optional[_ValidatorArgType[_T]] = ...,
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repr: _ReprArgType = ...,
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cmp: Optional[bool] = ...,
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hash: Optional[bool] = ...,
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init: bool = ...,
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metadata: Optional[Mapping[Any, Any]] = ...,
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type: object = ...,
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converter: Optional[_ConverterType[_T]] = ...,
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factory: Optional[Callable[[], _T]] = ...,
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kw_only: bool = ...,
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eq: Optional[bool] = ...,
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order: Optional[bool] = ...,
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) -> Any: ...
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@overload
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def attrs(
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maybe_cls: _C,
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these: Optional[Dict[str, Any]] = ...,
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repr_ns: Optional[str] = ...,
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repr: bool = ...,
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cmp: Optional[bool] = ...,
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hash: Optional[bool] = ...,
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init: bool = ...,
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slots: bool = ...,
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frozen: bool = ...,
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weakref_slot: bool = ...,
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str: bool = ...,
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auto_attribs: bool = ...,
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kw_only: bool = ...,
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cache_hash: bool = ...,
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auto_exc: bool = ...,
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eq: Optional[bool] = ...,
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order: Optional[bool] = ...,
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) -> _C: ...
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@overload
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def attrs(
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maybe_cls: None = ...,
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these: Optional[Dict[str, Any]] = ...,
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repr_ns: Optional[str] = ...,
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repr: bool = ...,
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cmp: Optional[bool] = ...,
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hash: Optional[bool] = ...,
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init: bool = ...,
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slots: bool = ...,
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frozen: bool = ...,
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weakref_slot: bool = ...,
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str: bool = ...,
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auto_attribs: bool = ...,
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kw_only: bool = ...,
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cache_hash: bool = ...,
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auto_exc: bool = ...,
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eq: Optional[bool] = ...,
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order: Optional[bool] = ...,
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) -> Callable[[_C], _C]: ...
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# TODO: add support for returning NamedTuple from the mypy plugin
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class _Fields(Tuple[Attribute[Any], ...]):
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def __getattr__(self, name: str) -> Attribute[Any]: ...
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def fields(cls: type) -> _Fields: ...
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def fields_dict(cls: type) -> Dict[str, Attribute[Any]]: ...
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def validate(inst: Any) -> None: ...
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# TODO: add support for returning a proper attrs class from the mypy plugin
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# we use Any instead of _CountingAttr so that e.g. `make_class('Foo', [attr.ib()])` is valid
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def make_class(
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name: str,
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attrs: Union[List[str], Tuple[str, ...], Dict[str, Any]],
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bases: Tuple[type, ...] = ...,
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repr_ns: Optional[str] = ...,
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repr: bool = ...,
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cmp: Optional[bool] = ...,
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hash: Optional[bool] = ...,
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init: bool = ...,
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slots: bool = ...,
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frozen: bool = ...,
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weakref_slot: bool = ...,
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str: bool = ...,
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auto_attribs: bool = ...,
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kw_only: bool = ...,
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cache_hash: bool = ...,
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auto_exc: bool = ...,
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eq: Optional[bool] = ...,
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order: Optional[bool] = ...,
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) -> type: ...
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# _funcs --
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# TODO: add support for returning TypedDict from the mypy plugin
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# FIXME: asdict/astuple do not honor their factory args. waiting on one of these:
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# https://github.com/python/mypy/issues/4236
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# https://github.com/python/typing/issues/253
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def asdict(
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inst: Any,
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recurse: bool = ...,
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filter: Optional[_FilterType[Any]] = ...,
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dict_factory: Type[Mapping[Any, Any]] = ...,
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retain_collection_types: bool = ...,
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) -> Dict[str, Any]: ...
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# TODO: add support for returning NamedTuple from the mypy plugin
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def astuple(
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inst: Any,
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recurse: bool = ...,
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filter: Optional[_FilterType[Any]] = ...,
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tuple_factory: Type[Sequence[Any]] = ...,
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retain_collection_types: bool = ...,
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) -> Tuple[Any, ...]: ...
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def has(cls: type) -> bool: ...
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def assoc(inst: _T, **changes: Any) -> _T: ...
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def evolve(inst: _T, **changes: Any) -> _T: ...
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# _config --
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def set_run_validators(run: bool) -> None: ...
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def get_run_validators() -> bool: ...
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# aliases --
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s = attributes = attrs
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ib = attr = attrib
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dataclass = attrs # Technically, partial(attrs, auto_attribs=True) ;)
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