tobgu/pyrsistent

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

2199 stars · 168 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Pyrsistent is a Python library providing persistent (immutable) data structures such as PVector, PMap, PSet, PRecord, and PClass, inspired by Clojure's functional collections. Mutating operations return new copies with structural path-sharing, leaving originals untouched.

Use cases

• use immutable lists and dicts in python to avoid side effects
• share state safely across threads without locks
• model records with type and invariant checking
• implement undo/history by keeping old versions of data structures
• write functional-style python code with persistent collections

When to choose

• you need immutable data structures with efficient structural sharing in Python
• you want Clojure-like persistent vectors, maps, and sets with a pythonic API
• you need checked records/classes with field types and invariants

When to avoid

• you need maximum raw performance for mutable-heavy workloads
• you only need simple frozen dataclasses or namedtuples
• you need data structures beyond those provided (check pyrsistent-extras instead)

Facets

library · maturity stable

serialization developer-tools programming-languages python cross-platform immutable-data-structures persistent-collections functional-programming pvector pmap

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