mirror of
https://github.com/correl/typesafe-monads.git
synced 2024-11-14 11:09:36 +00:00
33 lines
1.1 KiB
Python
33 lines
1.1 KiB
Python
from __future__ import annotations
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import functools
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from typing import Any, Callable, Generic, Iterable, List, TypeVar
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from .applicative import Applicative
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from .functor import Functor
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T = TypeVar("T")
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S = TypeVar("S")
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class Monad(Applicative[T]):
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# FIXME: Callable return type set to Any, as the proper value
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# (Monad[S]) is reported as incompatible with subclass
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# implementations due to a flaw in mypy:
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# https://github.com/python/mypy/issues/1317
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def bind(self, function: Callable[[T], Any]) -> Monad[S]: # pragma: no cover
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raise NotImplementedError
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@classmethod
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def pure(cls, value: T) -> Monad[T]: # pragma: no cover
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raise NotImplementedError
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# FIXME: Iterable type set to Any, as the proper value (Monad[T])
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# is reported as incompatible with subclass implementations due to
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# a flaw in mypy: https://github.com/python/mypy/issues/1317
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@classmethod
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def sequence(cls, xs: Iterable[Any]) -> Monad[List[T]]: # pragma: no cover
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"""Evaluate monadic actions in sequence, collecting results."""
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raise NotImplementedError
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__rshift__ = bind
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