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Versi: 12.x

Python dependencies

Added in: v12.4.0 (pnpm v12 only)

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Multi-ecosystem support is experimental. The settings and the layout it writes may change.

pnpm can install a project's Python dependencies alongside its npm packages. One pnpm install resolves both graphs, shares the same connection budget and credentials, and stores every verified wheel in pnpm's content-addressable store, so a wheel fetched for one project is reused by the next.

Turn it on in pnpm-workspace.yaml:

pnpm-workspace.yaml
python:
  enabled: true

pnpm reads the project's pyproject.toml, writes a pylock.toml, and builds an environment for it.

Adding a package​

Prefix the requirement with pypi::

pnpm add pypi:httpx
pnpm add pypi:httpx@0.28.1
pnpm add pypi:'httpx>=0.28'
pnpm add -D pypi:pytest

A bare name@version is written as an exact pin (httpx==0.28.1). A requirement that already carries a comparison operator is kept as written, and the full PEP 508 grammar is accepted, environment markers and extras included.

The environment​

Each project with a pyproject.toml gets a .venv in its own directory. It is a symlink into .pnpm/python-envs/, and pnpm swaps the link atomically when the environment changes, so a failed install leaves the previous environment in place.

pnpm refuses to touch a .venv it did not create, so an existing hand-made virtual environment is never replaced.

pnpm run and pnpm exec put the environment's script directory (.venv/bin, or .venv/Scripts on Windows) at the front of PATH, so a script can call pytest or ruff without activating anything.

Python requirement, marker, and lockfile semantics are kept separate from npm's and Cargo's. What is shared is the plumbing below them: the HTTP and authentication budget, artifact verification, and the store.

--lockfile-only, --frozen-lockfile, and --offline apply to Python dependencies too.

Faster resolution through pnpr​

With pnprServer set, the server resolves the Python graph, so pnpm does not have to download a wheel to find out what it requires. A server that does not answer for Python makes pnpm fall back to resolving locally.

Settings​

python.enabled​

  • Default: false
  • Type: Boolean

Whether pnpm install resolves and installs the project's Python dependencies.

python.executable​

  • Default: python3 (python on Windows)
  • Type: String

The interpreter pnpm probes and builds environments with.

python.indexUrl​

The Simple Repository API root pnpm resolves against.

python.extras​

  • Default: []
  • Type: String[]

The extras of the project to install.

python.groups​

  • Default: ['dev']
  • Type: String[]

The dependency groups to install.