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Add const Nothing instance. #20

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Add const Nothing instance. #20

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2 changes: 2 additions & 0 deletions src/maybe/__init__.py
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Original file line number Diff line number Diff line change
@@ -1,5 +1,6 @@
from .maybe import (
Nothing,
NOTHING,
Some,
SomeNothing,
Maybe,
Expand All @@ -10,6 +11,7 @@

__all__ = [
"Nothing",
"NOTHING",
"Some",
"SomeNothing",
"Maybe",
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1 change: 1 addition & 0 deletions src/maybe/maybe.py
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Expand Up @@ -289,6 +289,7 @@ def ok_or_else(self, op: Callable[[], E]) -> result.Err[E]:
"""
return result.Err(op())

NOTHING = Nothing()

# Define Maybe as a generic type alias for use in type annotations
Maybe: TypeAlias = Union[Some[T], Nothing]
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8 changes: 7 additions & 1 deletion tests/test_maybe.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@

from typing import Callable

from maybe.maybe import NOTHING
import pytest
import result

Expand Down Expand Up @@ -29,7 +30,12 @@ def test_eq() -> None:
assert Some(1) != "abc"
assert Some("0") != Some(0)


def test_const_nothing() -> None:
assert NOTHING == Nothing()
assert NOTHING.is_nothing() is True
assert Some(1) != NOTHING
assert len({Some(1), NOTHING}) == 2

def test_hash() -> None:
assert len({Some(1), Nothing(), Some(1), Nothing()}) == 2
assert len({Some(1), Some(2)}) == 2
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