pronto
Python frontend to ontologies.
Decision gist · record as of 2026-08-14
Yes. Pronto is a mature, well-maintained library for a specialized but important use case in bioinformatics. Low install friction, no known vulnerabilities, permissive licensing, and broad Python version support make it a low-risk addition. The aging maintenance status is typical for stable libraries. Install it if you need to work with biomedical ontologies in Python.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Low install friction with a pure-Python wheel distribution.
- Maintenance status is aging—last release was 214 days ago—but the repository remains active with recent commits and marked Production/Stable.
License · maintenance · safety
permissive license (permissive) — MIT License permits unrestricted use, modification, and distribution with minimal restrictions, suitable for both commercial and open-source projects.
last release 2026-01-12 (214 days) · last repo commit 2026-01-13 · 267 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 142,935 downloads/mo, #11,195 on PyPI
Alternatives
Verify before relying
from pronto import Ontology
go = Ontology("tests/data/go.obo.gz")
term = go['CL:0002116']
print(term.name)- Performance characteristics when working with large ontologies or deeply nested hierarchies.
- Completeness of OBO 1.4 format support across the full OBO Foundry catalog.
- Stability guarantees for OBO Graphs JSON format, noted as not yet stabilized.
What it is and what it does
Pronto is a Python library that acts as a frontend to ontologies, allowing you to load, manipulate, and export biomedical ontology data. It implements the Open Biomedical Ontologies 1.4 specification and supports three major formats: OBO, OBO Graphs in JSON, and OWL2 in RDF/XML. The library presents ontologies as navigable Python objects—you can access terms by identifier, traverse class hierarchies, create new terms, and serialize back to any supported format.
The package depends on chardet, fastobo, networkx, and python-dateutil. It is typed and supports Python 3.7 through 3.14. The library is explicit about non-standard assumptions and missing capabilities, surfacing these as warnings rather than silent failures.
Use it for
- Load and query biomedical ontologies to programmatically access term definitions and hierarchies.
- Convert OWL2 ontologies to OBO format for downstream tools requiring OBO.
- Build or extend ontologies by creating new terms, setting relationships, and exporting.
- Iterate over all terms to identify leaf nodes, compute statistics, or validate structure.
- Integrate ontology data into bioinformatics pipelines needing structured semantic information.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes.
Pronto is a mature, well-maintained library for a specialized but important use case in bioinformatics. Low install friction, no known vulnerabilities, permissive licensing, and broad Python version support make it a low-risk addition. The aging maintenance status is typical for stable libraries. Install it if you need to work with biomedical ontologies in Python.
Install
pronto on PyPI
Before you install
Low install friction with a pure-Python wheel distribution. Maintenance status is aging—last release was 214 days ago—but the repository remains active with recent commits and marked Production/Stable.
License in practice
MIT License permits unrestricted use, modification, and distribution with minimal restrictions, suitable for both commercial and open-source projects.
Quickstart
from pronto import Ontology
go = Ontology("tests/data/go.obo.gz")
term = go['CL:0002116']
print(term.name)Verify before relying
- Performance characteristics when working with large ontologies or deeply nested hierarchies.
- Completeness of OBO 1.4 format support across the full OBO Foundry catalog.
- Stability guarantees for OBO Graphs JSON format, noted as not yet stabilized.
Package facts
| License | permissive license permissive |
| Python support | Supports the current Python release >=3.7 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 4 packageschardetfastobonetworkxpython-dateutil |
| Maintenance | Aging 214 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 142,935 / month, #11,195 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 5 - Production/StableIntended Audience :: DevelopersIntended Audience :: Healthcare IndustryIntended Audience :: Science/ResearchLicense :: OSI Approved :: MIT LicenseOperating System :: OS IndependentProgramming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.14Programming Language :: Python :: 3.7Programming Language :: Python :: 3.8Programming Language :: Python :: 3.9Programming Language :: Python :: Implementation :: CPythonProgramming Language :: Python :: Implementation :: PyPyTopic :: Scientific/Engineering :: Bio-InformaticsTopic :: Scientific/Engineering :: Medical Science Apps.Topic :: Software Development :: Libraries :: Python ModulesTyping :: Typed |
Evidence: pronto-2.7.3-py3-none-any.whl
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See also fastobo · prov · bionty · owlready2 · linkml · edam-ontology · sssom · owlrl · bioc · bioregistry