hulista

Functional, immutable, concurrent Python — all batteries included.

hulista is the single published distribution for the full hulista toolkit. One install gives you immutable data structures, sealed typing, runtime dispatch, actor-style concurrency, collect-all task groups, functional combinators, and record-update ergonomics.

Documentation: https://rahulrajaram.github.io/hulista/

Why install the umbrella package?

Install hulista when you want a coherent batteries-included stack instead of picking packages one by one. It is especially useful for:

• event-driven or agent-style systems that combine immutable state with async orchestration
• teams that want one dependency and one docs entry point
• experimentation across the full package family before narrowing to individual imports

The hulista wheel bundles the toolkit's runtime modules directly:

Install

Install the full toolkit:

pip install hulista

The bundled modules remain importable directly if you prefer focused imports:

from persistent_collections import PersistentMap
from fp_combinators import pipe

Quick start

import hulista

# Persistent immutable map
m = hulista.PersistentMap().set("x", 1).set("y", 2)

# FP pipe
result = hulista.pipe(m, lambda pm: sum(pm.values()))

# Result type
ok = hulista.Ok(42)
err = hulista.Err("oops")

# Sealed hierarchy
@hulista.sealed
class Event: pass

class Click(Event): pass
class KeyPress(Event): pass

subs = hulista.sealed_subclasses(Event)  # {Click, KeyPress}

What you get

• PersistentMap / PersistentVector for immutable application state with structural sharing
• pipe, async_pipe, Ok, and Err for dataflow and typed error handling
• ActorSystem for supervised async workers and message passing
• Dispatcher for runtime-extensible type or predicate dispatch
• sealed for exhaustiveness-friendly closed hierarchies
• CollectorTaskGroup for collect-all structured concurrency
• updatable and with_update for record-update syntax on frozen models

Source layout

Each package lives in the monorepo with its own README and tests, but the public PyPI release is hulista:

• asyncio-actors/
• fp-combinators/
• live-dispatch/
• persistent-collections/
• sealed-typing/
• taskgroup-collect/
• with-update/

Requires Python 3.11+