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tach
A Python tool to visualize + enforce dependencies, using modular architecture 🌎 Open source 🐍 Installable via pip 🔧 Able to be adopted incrementally - ⚡ Implemented with no runtime impact ♾️ Interoperable with your existing systems 🦀 Written in rust
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Recent activity35% weight
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Project information10% weight
100
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README preview
Tach
Tach is a Python tool to enforce dependencies and interfaces, written in Rust.
Tach will guide you through initial project setup.
Run:
tach init
After an introductory message, you will see a file tree interface allowing you to interactively configure your project.
Use the arrow keys to navigate, and mark each module boundary with 'Enter'. You can mark all of your top-level Python packages, or just a few that you want to track.
If your Python code lives below your project root, or if you are working in a monorepo with multiple Python packages, mark your Python source roots using the 's' key.
Enforcement
Tach comes with a cli command to enforce the boundaries that you just set up! From the root of your Python project, run:
tach check
You will see:
✅ All modules validated!
You can validate that Tach is working by:
Removing an item from the depends_on key in tach.toml, or marking it as deprecated
By adding an import between modules that didn't previously import from each other.
Give both a try and run tach check again. This will generate an error:
❌ tach/check.py[L8]: Cannot use 'tach.filesystem'. Module 'tach' cannot depend on 'tach.filesystem'.
Each error indicates an import which violates your dependencies. If your terminal supports hyperlinks, click on the file path to go directly to the error.
When an error is detected, tach check will exit with a non-zero code. It can be easily integrated with CI/CD, Pre-commit hooks, and VS Code, and more!
Extras
Visualize your dependency graph.
tach show [--web]
Tach will generate a graph of your dependencies. Here's what this looks like for Tach:
Note that this graph is generated remotely with the contents of your tach.toml when running tach show --web.
If you would like to use the GraphViz DOT format locally, simply running tach show will generate tach_module_graph.dot in your working directory.
You can view the dependencies and usages for a given path:
tach report my_package/
# OR
tach report my_module.py
