No known security advisories.
The current version has no OSV.dev malware reports and no critical or high-severity vulnerabilities.
pettingzoo has 324K monthly downloads and 3K GitHub stars. Version 1.26.1 supports Python <3.15,>=3.9, first published in 2020.
It is actively maintained under a permissive license, last released in Apr 2026.
It is built on top of gymnasium and numpy. It is used by 78 tracked packages, including tianshou, kaggle-environments and gymnasium-robotics.
GitHub topics include api, gymnasium and multi-agent-reinforcement-learning.
Package Insights
Score breakdown - each component scores 0-100, weighted by percentage
Maintenance
90
Popularity
76
Adoption
55
Community
70
Provenance
0
How the maintenance status was determined
Last commit
5 days ago
Monthly downloads
324,339
•
Active
Activity within 30 days
Stable
Activity within 31-180 days
Minimal
Activity within 181-365 days, or no activity data
At Risk
No activity for > 365 days, but > 10,000 monthly downloads
Archived
Repository flagged as archived on GitHub
How the popularity category was determined
Monthly downloads
324,339
Stars
3,459
Stars per 1k downloads
10.66
Industry Standard
> 10,000,000 monthly downloads
Hidden Gem
< 0.5 stars per 1k downloads and > 100,000 monthly downloads
•
Community Favorite
> 5 stars per 1k downloads
Rising Star
Balanced ratio of stars to downloads
Unknown
Fewer than 1,000 monthly downloads, or no star data
How download momentum is calculated
Week daily avg
9,265
Month daily avg
10,811
Momentum
-14.3%
((week_daily_avg - month_daily_avg) / month_daily_avg) * 100Python version support tiers
requires_python
<3.15,>=3.9
Cutting Edge
Minimum supported version is 3.12 or newer
•
Modern
Minimum supported version is 3.9, 3.10, or 3.11
Legacy
Supports 3.8 or older (or Python 2)
Unknown
No requires_python specified or unparseable
License categories
License
MIT License
•
Permissive
MIT, Apache, BSD, ISC, Unlicense, CC0, etc.
Copyleft
GPL, LGPL, AGPL, MPL, EPL, etc.
Proprietary
Commercial, all rights reserved, custom EULAs
Unknown
No license specified, or none of the above match
How the release cadence was determined
Last release
71 days ago
Total releases
11
Releases/year
1.8
Rapid
Last release within 365 days and > 12 releases/year
•
Regular
Last release within 365 days
Slow
Last release 366-730 days ago
Stalled
Last release > 730 days ago, or no releases
Unknown
No usable release date available
How contributor risk was determined
Contributors
131
Monthly downloads
324,339
High Load
≤ 2 contributors and ≥ 50,000 monthly downloads
Moderate Load
< 10 contributors and ≥ 500,000 monthly downloads
Low Load
< 25 contributors and ≥ 5,000,000 monthly downloads, or sole maintainer with ≥ 10,000 monthly downloads
•
Balanced
Enough contributors for the package's popularity
Unknown
No contributor data available
Engagement
63
Issue Burden
6.4
per 1k stars
Discussions
0.0
per 1k stars
Fork Ratio
26.0%
contrib / forks
Stale Release
66d
PR Velocity
Quiet
Weekly Downloads
GitHub Stars
Not all downloads include detailed metadata. Breakdowns reflect the subset that does.
Downloads by OS
Linux
6.6K
Windows
349
macOS
316
Python Versions
3.11
56.2%
4.0K
3.12
23.3%
1.7K
3.10
13.3%
945
3.13
5.7%
403
3.14
1.5%
104
Top Countries
1.
US
4.8K
US
2.
SE
1.1K
SE
3.
JP
272
JP
4.
SG
173
SG
5.
PL
98
PL
6.
DE
87
DE
7.
CA
83
CA
8.
HK
79
HK
9.
CN
73
CN
10.
GB
65
GB
Dependencies
2
29 optional dependencies
- autorom[testing]
- box2d-py[sisl]
- box2d-py[all]
- chess[classic]
- chess[all]
- multi-agent-ale-py[all]
- multi-agent-ale-py[atari]
- pillow[all]
- pillow[other]
- pre-commit[testing]
- pygame-ce[classic]
- pygame-ce[all]
- pygame-ce[atari]
- pygame-ce[butterfly]
- pygame-ce[sisl]
- pymunk[all]
- pymunk[butterfly]
- pymunk[sisl]
- pynput[testing]
- pytest[testing]
- pytest-cov[testing]
- pytest-markdown-docs[testing]
- pytest-xdist[testing]
- rlcard[all]
- rlcard[classic]
- scipy[all]
- scipy[sisl]
- shimmy[all]
- shimmy[classic]
Used By
78
- tianshou
- kaggle-environments
- gymnasium-robotics
- agilerl
- poke-env
- mettagrid
- blokus-rl
- mpe2
- pyflyt
- pufferlib
- masa-safe-rl
- dsse
- replicantdrivesim
- clemcore
- footsies-gym
- reinforcement-learning-framework
- bsk-rl
- sumo-rl
- cogrid
- nmmo
- animo-trainer
- luxai-s2
- sotopia
- xuance
- joint-sim
- routerlurb
- gobblet-rl
- aigs
- pzu
- failure-api
- marl-aquarium
- bridgezoo
- generals-bots
- magbotsim
- sustaingym
- coltra
- safe-autonomy-sims
- azul-marl-env
- unstable-baselines3
- cognac
- syllabus-rl
- umshini
- rl-curriculum-bench
- mlgame3d-envs
- pokegym
- navground-learning
- ethical-smart-grid
- momaland
- multiagent-rl-rm
- cogment-lab
GitHub Topics
Tags from the package's GitHub repository describing what it does.
Package Information
License
MIT License
First Release
May 5, 2020
Last Release
2 months ago
Last Commit
5 days ago
Latest Version
1.26.1
Total Releases
11
Contributors
131
Open PRs
4
Archived
No
Python Versions
3
3.9
3.10
3.11
3.12
3.13
3.14
Wheels
py3
Keywords
Tracking Since
January 6, 2026
Data Updated
July 5, 2026
Data Freshness
Fresh