---
id: toolz
version: "1.1.0"
license: BSD-3-Clause
license_treatment: permissive
maintenance: aging
---

# toolz — List processing tools and functional utilities

License: permissive · Maintenance: aging · Popularity: top 1,000 on PyPI

## Install

pip install toolz
uv add toolz
poetry add toolz

## Description

Toolz
=====

|Build Status| |Coverage Status| |Version Status|

A set of utility functions for iterators, functions, and dictionaries.

See the PyToolz documentation at https://toolz.readthedocs.io

LICENSE
-------

New BSD. See `License File <https://github.com/pytoolz/toolz/blob/master/LICENSE.txt>`__.

Install
-------

``toolz`` is on the Python Package Index (PyPI):

::

    pip install toolz

Structure and Heritage
----------------------

``toolz`` is implemented in three parts:

|literal itertoolz|_, for operations on iterables. Examples: ``groupby``,
``unique``, ``interpose``,

|literal functoolz|_, for higher-order functions. Examples: ``memoize``,
``curry``, ``compose``,

|literal dicttoolz|_, for operations on dictionaries. Examples: ``assoc``,
``update-in``, ``merge``.

.. |literal itertoolz| replace:: ``itertoolz``
.. _literal itertoolz: https://github.com/pytoolz/toolz/blob/master/toolz/itertoolz.py

.. |literal functoolz| replace:: ``functoolz``
.. _literal functoolz: https://github.com/pytoolz/toolz/blob/master/toolz/functoolz.py

.. |literal dicttoolz| replace:: ``dicttoolz``
.. _literal dicttoolz:...

## AI interpretation — verify before relying

Toolz provides a set of utility functions for functional programming with iterators, functions, and dictionaries—composable tools for list processing and higher-order operations.

Verdict: Toolz is a mature, dependency-free utility library for functional programming in Python. With no known vulnerabilities, permissive licensing, and broad adoption (top 1000 PyPI), it is a safe and lightweight choice for functional composition tasks. The aging maintenance status reflects intentional stability rather than abandonment—the maintainers commit to critical fixes and security patches.

[View on SkillFed](https://skillfed.io/packages/toolz) · [View on PyPI](https://pypi.org/project/toolz/)