unidiff
Unified diff parsing/metadata extraction library.
Decision gist · record as of 2026-08-14
Yes. Unidiff is stable (Production/Stable status), actively maintained, has no dependencies, and solves a clear problem—parsing unified diffs into queryable objects. Use it whenever you need to programmatically analyze patch files or diffs beyond simple text parsing.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.9 or later.
- Low friction: pure Python wheel with no runtime dependencies.
- Actively maintained with a recent release 20 days ago and steady commit activity.
License · maintenance · safety
MIT (permissive) — MIT license is permissive; you can use this library freely in open-source and commercial projects with minimal restrictions.
last release 2026-07-25 (20 days) · last repo commit 2026-08-07 · 286 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 42,832,452 downloads/mo, #652 on PyPI
Alternatives
Verify before relying
pip install unidiff
from unidiff import PatchSet
patch = PatchSet.from_filename('file.diff', encoding='utf-8')
for patched_file in patch:
print(patched_file.path, patched_file.added, patched_file.removed)What it is and what it does
Unidiff is a Python library that parses unified diff format (the standard output of git diff, patch files, and similar tools) into structured objects you can query and manipulate. It reads diff data from files, strings, or file-like objects and exposes a tree of PatchSet → PatchedFile → Hunk → Line objects, each with metadata like line numbers, change type (added/removed/context), file modes, and symlink status.
You can inspect statistics (how many lines were added or removed per file), detect binary changes, extract individual hunks or lines, and reconstruct the original diff from modified objects. It also ships as a command-line tool that summarizes diff statistics. The library requires Python 3.9 or later and has no external dependencies, making it straightforward to integrate into build tools, code review systems, or any workflow that needs to analyze patches programmatically.
Use it for
- Parse git diffs or patch files in CI/CD pipelines to extract file change statistics and validate patch content.
- Build code review tools that need to inspect individual hunks and lines to flag specific changes.
- Analyze patch metadata (file modes, symlinks, binary status) in version control or deployment workflows.
- Extract and filter specific changes from large diffs for reporting or automated testing.
- Reconstruct or modify unified diffs by manipulating the object tree and regenerating the diff output.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes.
Unidiff is stable (Production/Stable status), actively maintained, has no dependencies, and solves a clear problem—parsing unified diffs into queryable objects. Use it whenever you need to programmatically analyze patch files or diffs beyond simple text parsing.
Install
unidiff on PyPI
Before you install
Low friction: pure Python wheel with no runtime dependencies. Actively maintained with a recent release 20 days ago and steady commit activity.
Requires Python 3.9 or later.
License in practice
MIT license is permissive; you can use this library freely in open-source and commercial projects with minimal restrictions.
Quickstart
pip install unidiff
from unidiff import PatchSet
patch = PatchSet.from_filename('file.diff', encoding='utf-8')
for patched_file in patch:
print(patched_file.path, patched_file.added, patched_file.removed)Package facts
| License | MIT permissive |
| Python support | Supports the current Python release >=3.9 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | None |
| Maintenance | Actively maintained 20 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 42,832,452 / month, #652 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 :: DevelopersLicense :: OSI Approved :: MIT LicenseProgramming Language :: Python :: 3Programming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.9Topic :: Software Development :: Libraries :: Python Modules |
Evidence: unidiff-1.0.0-py3-none-any.whl
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See also unidiff2 · moreorless · patch · types-unidiff · whatthepatch · patch-ng · diff-match-patch · diff-parser · icdiff · datadiff