Source code for returns.pointfree.bind_async

from typing import Awaitable, Callable, TypeVar

from returns.interfaces.specific.future import FutureLikeN
from import Kinded, KindN, kinded

_FirstType = TypeVar('_FirstType')
_SecondType = TypeVar('_SecondType')
_ThirdType = TypeVar('_ThirdType')
_UpdatedType = TypeVar('_UpdatedType')

_FutureKind = TypeVar('_FutureKind', bound=FutureLikeN)

[docs]def bind_async( function: Callable[ [_FirstType], Awaitable[KindN[_FutureKind, _UpdatedType, _SecondType, _ThirdType]], ], ) -> Kinded[Callable[ [KindN[_FutureKind, _FirstType, _SecondType, _ThirdType]], KindN[_FutureKind, _UpdatedType, _SecondType, _ThirdType], ]]: """ Compose a container and ``async`` function returning a container. In other words, it modifies the function's signature from: ``a -> Awaitable[Container[b]]`` to: ``Container[a] -> Container[b]`` This is how it should be used: .. code:: python >>> import anyio >>> from returns.future import Future >>> from import IO >>> from returns.pointfree import bind_async >>> async def coroutine(x: int) -> Future[str]: ... return Future.from_value(str(x + 1)) >>> bound = bind_async(coroutine)(Future.from_value(1)) >>> assert == IO('2') Note, that this function works for all containers with ``.bind_async`` method. See :class:`returns.primitives.interfaces.specific.future.FutureLikeN` for more info. """ @kinded def factory( container: KindN[_FutureKind, _FirstType, _SecondType, _ThirdType], ) -> KindN[_FutureKind, _UpdatedType, _SecondType, _ThirdType]: return container.bind_async(function) return factory