Python at Go speed

An all-in-one Python toolkit. Runtime, package manager, bundler, test runner, and formatter in one fast static binary.

curl -fsSL https://tamnd.github.io/bunpy/install.sh | bash
bunpy --version
# bunpy 0.11.15

macOS (arm64, x64) · Linux (arm64, x64) · Windows (x64)

Designed for speed

Written in Go. Cold starts in milliseconds, package resolution in seconds, no Python subprocess fan-out.

All in one

Replaces pip, pytest, ruff, and black. A single ~4 MB static binary. Copy it anywhere and it works.

Zero config

Drop a pyproject.toml and run bunpy install. No virtualenv, no requirements.txt, no activation step.

What’s inside

Package manager

Install, lock, and update PyPI packages. Reads pyproject.toml. Workspaces, overrides, audits, patches.

HTTP server

bunpy.serve handles routing, parsing, and response serialisation in Go. No framework required.

Bundler

Bundle to a portable .pyz archive or compile to a self-contained native binary.

Test runner

Run tests with bunpy test. Built-in coverage, reporters, filtering, and lifecycle hooks.

Web globals

fetch, URL, Request, Response, and WebSocket are available in every script. No import needed.

Native modules

SQL, Redis, S3, JWT, crypto, YAML, CSV, cron, and password hashing ship with the binary.

Compared to a Python toolchain

	bunpy	python + pip + venv
Runtime included	yes (Python 3.14)	requires CPython
Package install	built-in `bunpy add`	pip + manual venv
Test runner	built-in `bunpy test`	pytest (separate)
Bundler	built-in `bunpy build`	shiv / pyinstaller
Formatter	built-in `bunpy fmt`	black / ruff (separate)
HTTP server	built-in `bunpy.serve`	flask / fastapi
Native binary executable	`bunpy build --compile`	not supported

Quick look

# server.py
from bunpy.serve import serve

def handler(req):
    name = req.query.get("name", "world")
    return f"Hello, {name}!"

serve(handler, port=3000)

bunpy server.py
# Listening on http://localhost:3000

# fetch is available globally, no import needed
resp = fetch("https://api.github.com/repos/tamnd/bunpy")
print(resp.json()["stargazers_count"])

# Package manager
bunpy add requests fastapi
bunpy install --frozen
bunpy pm lock

Commands

Command	What it does
`bunpy script.py`	Run a Python script
`bunpy add requests`	Add a dependency
`bunpy install`	Install from `pyproject.toml`
`bunpy pm lock`	Resolve and pin all dependencies
`bunpy build app.py`	Bundle to `app.pyz`
`bunpy test`	Run tests
`bunpy fmt src/`	Format source
`bunpy repl`	Interactive REPL