Lazy Evaluation Python Packages

blosc2

A high-performance library for compressed ND arrays and columnar tables, with compute and indexing engines

lazify

Lazify all the things!

lazy-string

Python library for defining strings with delayed evaluation

streamable

sync/async iterable streams for Python

bpf4

lazy evaluated curves for python

ddx-ad

A C++23 library for automatic differentiation; python bindings available

polars-io-tools

Custom parsing extensions for lazy polars

unpythonic

Supercharge your Python with parts of Lisp and Haskell. Py3.10-3.14.

injectable

Python Dependency Injection for Humans™

lclang

A typed, async-first configuration expression language for Python. Lazy evaluation, contextual values, and dependency inspection.

fpstreams

Lazy Python pipelines for iterables and records, with bounded async concurrency.

seqtools

A python library to manipulate and transform indexable data (lists, arrays, ...)

lz

Functional utilities

dyna-zarr

A lightweight library for lazy operations on Zarr arrays without task graph overhead

pystreamlet

A fluent, lazy stream-processing library for Python, modeled after Java's Streams API

carriage

Less code, More productive. Enhanced Python collection classes for daily use

tributary

Streaming reactive and dataflow graphs in Python

fungeom

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

dataioc

Declarative data dependency graphs for Python, resolved on demand with provider overrides.

fazy

Lazy f-strings for everyone

kothon

Enhance Python with Kotlin's Sequence class and functional programming for efficient, expressive data pipelines.

phantom-ai

Sandboxed data analysis with LLMs (powered by DuckDB)

lune-lang

Teaching-first lazy functional language whose diagnostics speak your native language (ja/en) · 遅延評価の関数型入門言語

neurtu

Interactive parametric benchmarks in Python