quarto-ghp: execnb 0.2 breaks nbdev<3 — `ModuleNotFoundError: No module named 'execnb.nbio'`

Open

#77 opened on Apr 20, 2026 0 comments 1 reaction 0 assignees View on GitHub

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Assessment

Difficulty: 3/5
Estimated time: 1-2 days
Newbie friendliness: 65/100

Issue type: Bug
Clarity: Mostly clear
Activity status: Quiet
Tech stack: github-actions, python
Domain: ci-cd

Research direction

Start by locating the quarto-ghp action's install step that runs pip install -Uq "nbdev<3", then reproduce the provided workflow with the current dependency versions. Update the dependency handling so the action no longer raises ModuleNotFoundError: No module named 'execnb.nbio', and verify the workflow completes successfully.

Written by the indexing model from the issue text.

Description

Problem

quarto-ghp@master currently fails with:

ModuleNotFoundError: No module named 'execnb.nbio'

Root cause: The action runs pip install -Uq "nbdev<3", which pulls in the latest execnb (currently 0.2.1). execnb 0.2.0 removed the execnb.nbio submodule, but nbdev 2.x still imports it in nbdev/config.py:

from execnb.nbio import read_nb, NbCell

Affected: Any project using answerdotai/workflows/quarto-ghp@master as of execnb 0.2.0 release.

Reproduction

steps: [uses: answerdotai/workflows/quarto-ghp@master]

Output:

File ".../nbdev/config.py", line 20, in <module>
    from execnb.nbio import read_nb,NbCell
ModuleNotFoundError: No module named 'execnb.nbio'

Fix

Either:

Pin execnb<0.2 in the action's install step alongside nbdev<3
Migrate quarto-ghp to use nbdev>=3 (which uses the new execnb API)

Workaround

Projects can work around this today by setting PIP_CONSTRAINT at the job level to a constraints.txt that contains execnb<0.2:

jobs:
  gh_pages:
    env:
      PIP_CONSTRAINT: constraints.txt  # contains: execnb<0.2
    steps: [uses: answerdotai/workflows/quarto-ghp@master]

Dominant language: Python
Stars: 44
Forks: 40
PR merge metrics: No merged PRs in 30d

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