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Software

py_trees

By splintered-reality, from github.com/splintered-reality/py_trees (opens in a new tab)

  • Middleware
  • Library
  • BSD-3-Clause

PyTrees is a Python library for behaviour trees, used to build decision-making logic for robots and similar systems. It is meant for medium-sized decision engines.

Open on GitHub (opens in a new tab)

Facts

GitHub stars
652read on 6 Nov 2026
Last update
4 Nov 2026Newest commit on devel
Maintenance
Activea commit in the last 90 days
Difficulty
Intermediate

Checked on GitHub on 6 Nov 2026.

Licenses

Code
BSD-3-Clause (opens in a new tab)

Read by Robotheca from LICENSE (opens in a new tab) at commit 49bcffd (opens in a new tab), on 6 Nov 2026. A license text Robotheca's reader does not know: a person at Robotheca set it on 9 Nov 2026.

Commercial use
Yes

Overview

What it does: Robotheca's summary

  • Provides behaviours, decorators, sequences, selectors, parallels and a behaviour tree container.
  • Offers blackboards for sharing data between behaviours.
  • Includes a library of ready-made behaviours, decorators and idioms.
  • Adds a ports API and XML parser for declarative behaviour definitions.
  • Can serialise trees to a dot graph or render them as ascii/unicode in a terminal.
  • Ships demo scripts to explore the library; tested on Linux and Mac.

Written by Robotheca from the project's README (opens in a new tab) at commit 41ec377, not by its creator.

The README

Read the README on GitHub (opens in a new tab)

Files and versions

Facts read at commit 49bcffd

Robotheca read the repository at two versions: the summary at 41ec377 and the facts at 49bcffd (read on 6 Nov 2026).

Robotheca never hosts the code: each link goes to the creator's own page.

Use it

How to install it, in the creator's words: The project's website (opens in a new tab)

Robotheca doesn't review code. Read it before running it.

Robotheca lists software as a reference: nothing is hosted or run here, and every fact links to where it was read.