unidiff2
Unified diff parsing/metadata extraction library.
Decision gist · record as of 2026-08-14
Yes, if you need to parse unified diffs in Python and want a dependency-free solution. The low install friction and permissive license are advantages. However, the package is very new (first release October 2025) and aging maintenance status means you should verify that it meets your stability expectations and that the original unidiff project hasn't resumed active development before committing to it in production.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Low friction—pure Python wheel with no runtime dependencies.
- Maintenance status is aging: last commit was 2025-11-03 and the package is only a few months old (first release 2025-10-03), so long-term stability is unproven.
License · maintenance · safety
MIT (permissive) — MIT license is permissive; you can use, modify, and distribute this package with minimal restrictions, provided you retain the license notice.
last release 2025-10-30 (288 days) · last repo commit 2025-11-03 · 1 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 196,523 downloads/mo, #9,784 on PyPI
Alternatives
Verify before relying
pip install unidiff2
from unidiff import PatchSet
patch = PatchSet.from_filename('file.diff', encoding='utf-8')
for patched_file in patch:
print(f"{patched_file.path}: +{patched_file.added} -{patched_file.removed}")- Whether this fork is actively maintained long-term or if the original unidiff package has resumed development
- Performance characteristics when parsing very large diff files
- Compatibility with edge cases in diff formats from different tools (e.g., Mercurial, Bazaar, Subversion)
What it is and what it does
unidiff2 is a Python library that parses unified diff format (the standard output of `git diff`, `patch` files, and similar tools) into a structured object model. It lets you programmatically inspect which files changed, how many lines were added or removed, access individual hunks and their line-by-line content, and regenerate diff output from the parsed structure.
The package is a maintained fork of the original unidiff library. It has no external runtime dependencies and supports Python 3.7 through 3.11. You can load diffs from files, file-like objects, or iterables, and optionally parse metadata-only for efficiency. It also provides a command-line tool to summarize diff statistics.
Use it for
- Analyze git diffs programmatically in CI/CD pipelines to enforce code review policies or generate reports
- Parse patch files to determine which files and functions were modified without applying the patch
- Build tooling that needs to understand the structure of code changes (e.g., impact analysis, test selection)
- Extract and display diff statistics in a custom format or dashboard
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you need to parse unified diffs in Python and want a dependency-free solution.
The low install friction and permissive license are advantages. However, the package is very new (first release October 2025) and aging maintenance status means you should verify that it meets your stability expectations and that the original unidiff project hasn't resumed active development before committing to it in production.
Install
unidiff2 on PyPI
Before you install
Low friction—pure Python wheel with no runtime dependencies. Maintenance status is aging: last commit was 2025-11-03 and the package is only a few months old (first release 2025-10-03), so long-term stability is unproven.
License in practice
MIT license is permissive; you can use, modify, and distribute this package with minimal restrictions, provided you retain the license notice.
Quickstart
pip install unidiff2
from unidiff import PatchSet
patch = PatchSet.from_filename('file.diff', encoding='utf-8')
for patched_file in patch:
print(f"{patched_file.path}: +{patched_file.added} -{patched_file.removed}")Verify before relying
- Whether this fork is actively maintained long-term or if the original unidiff package has resumed development
- Performance characteristics when parsing very large diff files
- Compatibility with edge cases in diff formats from different tools (e.g., Mercurial, Bazaar, Subversion)
Package facts
| License | MIT permissive |
| Python support | Supports the current Python release >=3.7 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | None |
| Maintenance | Aging 288 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 196,523 / month, #9,784 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 4 - BetaIntended Audience :: DevelopersLicense :: OSI Approved :: MIT LicenseOperating System :: OS IndependentProgramming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.7Programming Language :: Python :: 3.8Programming Language :: Python :: 3.9 |
Evidence: unidiff2-0.7.8-py3-none-any.whl
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See also unidiff · patch · whatthepatch · types-unidiff · moreorless · patch-ng · diff-parser · diff-match-patch · icdiff · reqif