archetype-smol
archetype-smol is a deliberately small, synchronous, in-memory DataFrame ECS
for learning the core Archetype model. It is a separate engine, not a
compatibility layer for archetype-ecs.
uv add archetype-smol
from daft import col
from archetype.smol import Component, Processor, World
class Position(Component):
x: float = 0.0
class Move(Processor):
components = (Position,)
def process(self, df, *, tick):
return df.with_column("position__x", col("position__x") + 1)
world = World(processors=[Move()])
entity_id = world.spawn(Position(x=2))
world.step()
assert world.query(Position).to_pylist() == [
{"entity_id": entity_id, "tick": 1, "is_active": True, "position__x": 3.0}
]
Smol keeps only the teaching loop: typed Components, priority-ordered DataFrame Processors, immediate in-memory entity mutation, atomic steps, and queryable snapshots. It intentionally has no storage providers, commands, Activities, hooks, runtime host, API, CLI, or world-library extension system.
Component fields must resolve to None, bool, int, float, str,
bytes, or nested lists of those scalar values. Smol rejects mappings,
tuples, enums, nested models, and other values whose Python identity is erased
by DataFrame materialization. Encode structured teaching state as a JSON string
in a _json field; use archetype-ecs when typed structured storage is part of
the exercise.
1 maintainer
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