valanga 0.2.4

Shared types and utilities for evaluation

valanga

Shared Python types and lightweight utilities for describing turn-based games and their evaluations. The package exposes protocols for representing states, outcomes, and state representations that other libraries can build on.

Key concepts

• Game primitives: State, HasTurn[RoleT], and TurnState[RoleT] model states and acting roles. Color remains the natural role type for black/white games, while SoloRole supports single-player sequential games without fake color semantics. 【F:src/valanga/game.py†L1-L189】
• Evaluations: Value carries a score, certainty level, and optional terminal OverEvent metadata. 【F:src/valanga/evaluations.py†L31-L47】
• Game termination: OverEvent stores outcome, termination, and optional winner metadata. 【F:src/valanga/over_event.py†L1-L99】
• State representations: ContentRepresentation defines how to turn a State into evaluator input, and RepresentationFactory builds or updates those representations from states and modifications. 【F:src/valanga/represention_for_evaluation.py†L9-L22】【F:src/valanga/representation_factory.py†L7-L55】
• Progress reporting: PlayerProgressMessage is a Color-specific helper for per-player progress reporting. It is not part of the core generic role model. 【F:src/valanga/progress_messsage.py†L1-L13】

Installation

pip install .

The project targets Python 3.13 and has no required runtime dependencies.

Quick start

Below is a minimal example that records both a two-player terminal result and a single-player terminal result:

from enum import Enum, auto

from valanga import Color, Outcome, OverEvent


class ChessTermination(Enum):
    CHECKMATE = auto()


class PuzzleTermination(Enum):
    GOAL_REACHED = auto()


# Two-player result: white wins by checkmate.
checkmate = OverEvent(
    outcome=Outcome.WIN,
    termination=ChessTermination.CHECKMATE,
    winner=Color.WHITE,
)

# Single-player result: the puzzle objective was reached.
puzzle_clear = OverEvent(
    outcome=Outcome.WIN,
    termination=PuzzleTermination.GOAL_REACHED,
)

print(checkmate.is_win_for(Color.WHITE))  # -> True
print(puzzle_clear.is_success())  # -> True

To wire in a custom state representation, supply callables to RepresentationFactory that know how to build representations from a State and its modifications.

Development

Install the development dependencies and run the test suite:

pip install -e '.[dev]'
pytest