Package manager

bunpy ships a complete package manager that reads pyproject.toml, resolves dependencies against PyPI, and installs wheels into .bunpy/site-packages/.

No pip, no virtualenv, no poetry. Just bunpy.

bunpy install          # install from pyproject.toml + lock
bunpy add requests     # add a package
bunpy remove requests  # remove a package
bunpy update           # upgrade to latest compatible versions
bunpy pm lock          # lock without installing
bunpy pm lock --check  # verify lock is up to date (CI)

Installing packages

bunpy install and how it works

Adding and removing

bunpy add / remove

Workspaces

Monorepo support with [tool.bunpy.workspace]

Lockfile

bunpy.lock format and reproducibility

pyproject.toml

bunpy uses the standard pyproject.toml:

[project]
name = "myapp"
version = "0.1.0"
requires-python = ">=3.12"
dependencies = [
    "requests>=2.28",
    "pydantic>=2.0",
]

[dependency-groups]
dev = [
    "pytest>=8.0",
    "black>=24.0",
]

[project.optional-dependencies]
web = ["fastapi>=0.100", "uvicorn>=0.23"]

Dependency lanes

Lane	pyproject.toml key	Install flag
Production	`[project] dependencies`	default
Dev	`[dependency-groups] dev`	`-D`
Optional extras	`[project.optional-dependencies]`	`--all-extras`
Peer	`[tool.bunpy] peer-dependencies`	`-P`