papermill-tenki

A papermill engine that executes parameterized Jupyter notebooks inside disposable Tenki Sandbox microVMs.

Parameter injection happens locally in papermill as usual; the already parameterized notebook is uploaded to a fresh sandbox, executed there with jupyter nbconvert --execute, and the executed notebook (outputs, plots, errors) is downloaded and saved to papermill's output path. The sandbox is destroyed afterwards.

Install

pip install papermill-tenki

Setup

export TENKI_API_KEY=tk_...          # from your Tenki workspace settings

Usage

CLI (-p name value injects a notebook parameter, only if the notebook has a parameters cell that declares it):

papermill input.ipynb output.ipynb --engine tenki -p learning_rate 0.5

Python:

import papermill

papermill.execute_notebook(
    "input.ipynb",
    "output.ipynb",
    engine_name="tenki",
    # notebook parameters — only for notebooks with a `parameters` cell; omit otherwise:
    parameters={"learning_rate": 0.5},
    # optional engine kwargs (override env vars); see Configuration below:
    # image="...", sandbox_name="my-run",
    # cpu_cores=4, memory_mb=8192,
)

bootstrap is enabled by default and installs the jupyter toolchain in the sandbox for you — only set bootstrap=False if your image already has it.

Configuration

TENKI_API_KEY is read by the Tenki SDK itself, which also resolves the workspace the sandbox is created in.

Notebook dependencies (numpy, pandas, ...) must exist in the sandbox: bake them into a custom image, or add a bootstrap cell at the top of the notebook. The kernel requested by the notebook must be installed in the sandbox; when it isn't and python3 is available, the engine falls back to python3 with a warning.

Timeouts

papermill's --start-timeout and --execution-timeout are forwarded to the remote nbconvert run (startup_timeout / timeout on the ExecutePreprocessor).

Tests

pip install -e .[dev]
pytest                       # unit tests, fully mocked, no network
TENKI_API_KEY=... pytest tests/test_live_smoke.py   # live smoke test