Immutable Python Packages

pyrsistent

Persistent/Immutable/Functional data structures for Python

immutabledict

A fork of frozendict, an immutable wrapper around dictionaries for Python3

frozendict

A simple immutable dictionary for Python

immutables

A high-performance immutable mapping type for Python.

lenses

A python lens library for manipulating deeply nested immutable structures

friendly-sequences

Friendly, Scala like, Sequence interface

constantdict

An immutable dict class for Python.

gelidum

Freeze your objects in python

namedtupled

Lightweight namedtuple wrapper for attribute-style data access (a la JavaScript objects).

immutable-views

Immutable views on other collection objects

haiway

Modern Python framework for functional programming and structured concurrency. Developed by Miquido.

zef

Toolkit for graph-relational data across space and time

fungeom

A generic functional substrate implemented as an immutable, decidable resolver graph.

freezabledict2

A Freezable Dictionary Type Object inspired by frozenlist, library has a 2 prefix due to many names taken

cdk-immukv

Immutable key-value store using only S3 versioning. Python & TypeScript clients + AWS CDK constructs.

readonlydict

Drop-in read-only dictionary with 100% typing and runtime compatibility

dfa

A simple python implementation of a DFA.

dinero

Precise, Type-Safe Monetary Calculations in Python

sovereign-shield

Production-grade AI defense — hybrid deterministic filters + optional LLM veto + HITL approval + file validation + hallucination detection. OS-enforced immutability.

cawdrey

Several useful custom dictionaries for Python 📖 🐍

clearflow

Correctness-first orchestration for emergent AI. Type-safe, deeply immutable, 100% code coverage.

intentshield

Pre-execution intent verification for AI agents

algograph

Immutable graph data structures and algorithms library with interactive shell

rsdict

Type or key restricted and resettable Python dictionary