[ GitHub: latk/ganzua | PyPI: ganzua | Documentation: https://ganzua.latk.de ]

Ganzua is tool for picking dependency information from Python lockfiles, and manipulating the version constraints in pyproject.toml files.

For example, we can summarize the differences between two uv.lock files. Ganzua is designed for scripting, so by default we get JSON output:

$ ganzua diff corpus/old-uv-project corpus/new-uv-project
{
  "stat": {
    "total": 2,
    "added": 1,
    "removed": 0,
    "updated": 1
  },
  "packages": [
    {
      "name": "annotated-types",
      "old": null,
      "new": {
        "name": "annotated-types",
        "version": "0.7.0",
        "source": "pypi"
      }
    },
    {
      "name": "typing-extensions",
      "old": {
        "name": "typing-extensions",
        "version": "3.10.0.2",
        "source": "pypi"
      },
      "new": {
        "name": "typing-extensions",
        "version": "4.14.1",
        "source": "pypi"
      },
      "is_major_change": true
    }
  ]
}

We can also opt in to Markdown (GFM) output, which will produce a summary and a table:

$ ganzua diff --format=markdown corpus/old-uv-project corpus/new-uv-project
2 changed packages (1 added, 1 updated)

| package           | old      | new    | notes |
|-------------------|----------|--------|-------|
| annotated-types   | -        | 0.7.0  |       |
| typing-extensions | 3.10.0.2 | 4.14.1 | (M)   |

* (M) major change

Aside from inspecting or diffing lockfiles, we can extract and manipulate constraints from pyproject.toml files:

$ ganzua constraints inspect --format=markdown corpus/new-uv-project/pyproject.toml
| package           | version |
|-------------------|---------|
| annotated-types   | >=0.7.0 |
| typing-extensions | >=4     |

For more examples and further background, see the announcement blog post.

Also see the up to date documentation at https://ganzua.latk.de.

Ganzua is available on PyPI: https://pypi.org/project/ganzua/

Recommended: run or install via the uv package manager:

• uvx ganzua to try Ganzua without installation
• uv tool install ganzua to install Ganzua on your machine

Alternative: run or install via the pipx tool:

• pipx run ganzua to try Ganzua without installation
• pipx install ganzua to install Ganzua on your machine

When invoking Ganzua in scripts or in a CI job, consider pinning or constraining a version. This prevents your scripts from breaking when Ganzua has an incompatible change. For example:

• uvx ganzua==0.4.0 to pin an exact version
• uvx 'ganzua>=0.4.0' to constraint to a version range (remember quotes to escape special characters like <)

To preview a bleeding-edge version without waiting for a PyPI release, you can install directly from the Ganzua repository on GitHub. For example:

• uvx git+https://github.com/latk/ganzua.git
• pipx run --spec git+https://github.com/latk/ganzua.git ganzua

Do not add Ganzua as a dependency to your project, instead prefer invoking Ganzua via uvx or pipx run. You can technically install Ganzua into an existing venv using tools like uv, Poetry, or Pip. But since Ganzua might require conflicting dependencies, and might even need a different Python version, this is likely to cause more problems than it solves.

Usage: ganzua [OPTIONS] COMMAND [ARGS]...

See the command line reference on the website for detailed docs on each subcommand:

• ganzua Inspect Python dependency lockfiles (uv, Poetry, pylock.toml).
• ganzua help Show help for the application or a specific subcommand.
• ganzua inspect Inspect a lockfile.
• ganzua diff Compare two lockfiles.
• ganzua constraints Work with pyproject.toml constraints.
• ganzua constraints inspect List all constraints in the pyproject.toml file.
• ganzua constraints bump Update pyproject.toml dependency constraints to match the lockfile.
• ganzua constraints reset Remove or relax any dependency version constraints from the pyproject.toml.
• ganzua schema Show the JSON schema for the output of the given command.

Ganzua is Open Source software, provided to you free of charge and on an "as is" basis. You are not entitled to support, help, or bugfixes of any kind.

Nevertheless, the Ganzua project may occasionally offer help.

• If you have questions about using Ganzua, you may search existing posts at https://github.com/latk/ganzua/discussions and start a new discussion if necessary.
• If you have discovered a bug in Ganzua, please report it at https://github.com/latk/ganzua/issues.

Ganzua is Open Source but not open contribution. Please do not submit code changes. If you want to help with feature work or bugfixes, instead report an issue, and provide an analysis of the problem.

Humans are welcome, bots are not. LLM-generated submissions will be deleted without discussion.

Ganzua intends to maintain a backwards-compatible command line interface, and intends to use SemVer version numbers.

Only those parts of the CLI that are relevant for scripting are covered by this stability policy:

• commands that inspect or modify files
• machine-readable output, e.g. the schema of JSON output

For example, Ganzua might increment the "minor" version number if a new field is added to JSON output or if new command line options are added, and increment the "major" version if output fields are removed or new required command line arguments are added.

Many other features are out of scope of this stability policy. Arbitrary changes here are expected, will happen without notice, and without major version bumps. Examples:

• interacting with ganzua as a Python module – you must stick to the CLI
• Python versions or dependency versions used by Ganzua – isolated installations via pipx or uvx/uv tool are highly recommended
• formatting of human-readable output (e.g. Markdown) – use the JSON output if you're scripting with Ganzua
• formatting of error messages
• commands and flags that relate to help messages

The Spanish term ganzúa means lockpick. It is pronounced gan-THU-a.

This ganzua tool for interacting with Python dependency lockfiles is unrelated to the 2004 cryptoanalysis tool of the same name.

Ganzua is not a general-purpose tool. It's focused solely on working with modern Python project managers and their native lockfile formats: uv, Poetry, and the PEP-751 pylock.toml format. In particular, there's no support for requirements.txt.

Ganzua strives to be complete, compliant, and correct. Ganzua is 0% AI and 100% human expertise, informed by reading the relevant PEPs, docs, and the source code of relevant tools. The tool is thoroughly tested with 100% branch coverage, and has seen extensive use in large-scale real-world projects. Ganzua is intentionally stupid and avoids dangerous stuff like editing lockfiles or interacting with Git.

Ganzua is designed for scripting. All subcommands are designed for JSON output first, with output that conforms to a stable schema. Where appropriate, Ganzua offers an optional Markdown view on the same data, which lets scripts generate human-readable summaries. Ganzua does not offer GitHub Actions, but it's really easy to integrate Ganzua into your CI workflows.

Copyright 2025-2026 Lukas Atkinson

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.