managing-python-dependencies
Ensures proper Python dependency management, avoiding global `pip install` and adhering to project-specific tooling. Use this skill if any of the following are true: 1. Attempting to run `pip install {package_name}`. 2. Python packages or dependencies need to be added or modified. 3. Initiating a new Python project. 4. Creating a new notebook, even if just using BigQuery cells. 5. Generating Python code that includes `import` statements for third-party libraries. 6. Before executing Python scripts via the terminal to ensure the correct virtual environment is active.
What this skill does
# Python Dependency Management Rule
> [!CAUTION] **BEFORE any `pip install`**: You MUST first detect the project's
> existing dependency manager and use it correctly. Do NOT override the
> project's established tooling.
## Dependency Manager Detection
Before installing ANY Python package, check the workspace for these files **in
priority order**:
1. **Signal:** `uv.lock` or `pyproject.toml` with `[tool.uv]`
* **Tool:** **uv**
* **Install:** `uv add <package>`
* **Setup:** `uv sync`
2. **Signal:** `pyproject.toml` with `[tool.poetry]`
* **Tool:** **Poetry**
* **Install:** `poetry add <package>`
* **Setup:** `poetry install`
3. **Signal:** `Pipfile`
* **Tool:** **Pipenv**
* **Install:** `pipenv install <package>`
* **Setup:** `pipenv install`
4. **Signal:** `environment.yml`
* **Tool:** **Conda**
* **Install:** `conda install <package>`
* **Setup:** `conda env create -f environment.yml`
5. **Signal:** `requirements.txt` only
* **Tool:** **venv + pip**
* **Install:** `.venv/bin/pip install <package>`
* **Setup:** `.venv/bin/pip install -r requirements.txt`
6. **Signal:** None of the above
* **Tool:** **venv + pip** (default)
* **Install:** `.venv/bin/pip install <package>`
* **Setup:** `.venv/bin/pip install -r requirements.txt`
## Default: venv + pip
If no dependency manager is detected, use **venv + pip + requirements.txt** as
the default:
```bash
# Initialize environment
python3 -m venv .venv
# Add dependencies
.venv/bin/pip install <package>
# Preserve state
.venv/bin/pip freeze > requirements.txt
```
**Rules for venv + pip workflow:**
- Always use `.venv/bin/pip` or `.venv/bin/python` (explicit path).
- After installing, run: `.venv/bin/pip freeze > requirements.txt`.
- When setting up: `.venv/bin/pip install -r requirements.txt`.
## Prohibited
- **NEVER** run `pip install` globally
- **NEVER** override an existing dependency manager with a different one
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