# Drop Python

> Use when dropping a Python version from a project

- **Type:** Skill
- **Install:** `agentstack add skill-henryiii-skills-drop-python`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [henryiii](https://agentstack.voostack.com/s/henryiii)
- **Installs:** 0
- **Category:** [Agent Skills](https://agentstack.voostack.com/c/agent-skills)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [henryiii](https://github.com/henryiii)
- **Source:** https://github.com/henryiii/skills/tree/main/drop-python

## Install

```sh
agentstack add skill-henryiii-skills-drop-python
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# Dropping Python Support

This guide provides step-by-step instructions for removing a Python support
from a project. If the user doesn't specify a version, assume the lowest
supported version is being bumped by one. Always drop one Python version at a
time.

Below, `` is used instead of a specific digit; if dropping 3.9, then
`` is 9.

## Before You Start

- `uv` is required, quit if they are not installed. You can run any
  other project-specific tools via `uvx`, such as `nox` -> `uvx nox` and `prek`
  -> `uvx prek` if they are not present.
- `prek` is a faster Rust rewrite of `pre-commit` with the same config and
  similar options. `prek -a --quiet` is best for running it.

## Key Steps

### 1. Update `pyproject.toml` (or `setup.cfg` or `setup.py`)

Update Python version classifiers and requirements with the new minimum
version. For example, if dropping Python 3.9:

```toml
[project]
requires-python = ">=3.10"
classifiers = [
    "Programming Language :: Python :: 3",
    # Remove "Programming Language :: Python :: 3.9",
    "Programming Language :: Python :: 3.10",
    # ...
]
```

### 2. Update CI/CD Configuration

If the next version is already tested, drop it. If not, update from the old to the new.

* GitHub Actions (`.github/workflow/*.yml`)
* Other common CI systems

### 3. Update Pre-commit Hooks

Check `.pre-commit-config.yaml` for anything pinned to to the old version.

### 4. Update other configuration

Some tools also pin in pyproject.toml. Check for `3. and 3` text. Some common locations:

* ruff: Usually Ruff reads `project.requires-python`, but if it's hardcoded, it's `tool.ruff.target-version` in pyproject.toml or `ruff.target-version` in `ruff.toml` or `.ruff.toml`
* mypy: `tool.mypy.python_version`
* pylint: `tool.pylint.py-version` (can also be `tool.pylint.master.py-version` (deprecated) or `tool.pylint.main.py-version`)

### 5. If cibuildwheel is used

Check for usage of `cp3` / pp3` in `[tool.cibuildwheel]` as well as in the CI.

### 6. Run Automated Upgrades

```bash
prek -a --quiet
```

### 7. Review & Modernize Code

Custom patterns to look for, for specific versions of Python are provided:

* Python 3.7: Read resources/python-37.md
* Python 3.8: Read resources/python-38.md
* Python 3.9: Read resources/python-39.md
* Python 3.10: Read resources/python-310.md
* Python 3.11: Read resources/python-311.md
* Python 3.12: Read resources/python-312.md
* Python 3.13: Read resources/python-313.md
* Python 3.14: Read resources/python-314.md

### 8. Update Documentation

- Update README, CONTRIBUTING, and docs
- Update installation requirements

### 9. Test & Validate

If the project has::

```toml
[dependency-groups]
dev = # ...
```

Then run:

```
uv run pytest
```

Otherwise check for nox or tox, and run that.

### 10. Double-check for Remaining References

```bash
# Search for 3. references
git grep "\b3\.\b"
git grep "\bpy3\b"
git grep "3, "
```

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [henryiii](https://github.com/henryiii)
- **Source:** [henryiii/skills](https://github.com/henryiii/skills)
- **License:** MIT

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-henryiii-skills-drop-python
- Seller: https://agentstack.voostack.com/s/henryiii
- Browse the marketplace: https://agentstack.voostack.com/browse

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Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.