pynpm-cli 0.1.2

An npm-like package manager for Python that uses pip under the hood

pynpm — An npm-like Package Manager for Python

pynpm is a Python package manager inspired by npm. It uses pip under the hood but gives you clean dependency management with package.yml and package-lock.yml, automatic virtual environment handling, and no unnecessary transitive dependencies polluting your project.

Features

• pynpm init — Initialize a project with package.yml and .venv (like npm init)
• pynpm install <pkg> — Install a package and save it to package.yml (like npm install)
• pynpm install — Install all dependencies from package.yml / lockfile (like npm install)
• pynpm uninstall <pkg> — Remove a package and clean up orphaned transitive deps
• pynpm list — Show project dependencies and their installed versions
• pynpm run <script> — Run scripts defined in package.yml (like npm run)
• Automatic .venv — Creates and uses a virtual environment automatically
• Lockfile — package-lock.yml locks exact versions for reproducible installs
• Orphan cleanup — Uninstalling a package also removes its unused transitive dependencies

Installation

pip install pynpm-cli

Quick Start

# Create a new project
mkdir my-project && cd my-project
pynpm init

# Install packages
pynpm install requests
pynpm install flask

# Install dev dependencies
pynpm install -D pytest

# Install all deps from package.yml (like npm install)
pynpm install

# Run a script
pynpm run test

# Remove a package
pynpm uninstall flask

# List dependencies
pynpm list

package.yml

Your project configuration lives in package.yml:

name: my-project
version: 1.0.0
description: My awesome project
author: Your Name
license: MIT
python: ">=3.8"

scripts:
  start: python main.py
  test: pytest

dependencies:
  requests: "==2.31.0"
  flask: "==3.0.0"

dev_dependencies:
  pytest: "==8.0.0"

package-lock.yml

The lockfile captures the exact versions of all installed packages (including transitive dependencies) for reproducible installs:

lockfile_version: 1
packages:
  requests:
    version: "2.31.0"
  urllib3:
    version: "2.1.0"
  charset-normalizer:
    version: "3.3.2"

Command Aliases

Full Command	Alias
pynpm install	pynpm i
pynpm uninstall	pynpm rm

How It Works

1. pynpm init creates package.yml, .venv, and .gitignore
2. pynpm install <pkg> installs into .venv via pip, records the direct dependency in package.yml, and snapshots all installed versions into package-lock.yml
3. pynpm uninstall <pkg> removes the package, cleans up orphaned transitive deps, and updates both config files
4. pynpm install (no args) reads package-lock.yml for exact versions, or falls back to package.yml version specs

Publishing to PyPI

This project uses GitHub Actions with PyPI trusted publishing. To publish:

1. Configure trusted publishing on PyPI for your repository
2. Create a GitHub release — the workflow builds and publishes automatically

License

MIT