ModuleNotFoundError: No module named 'fastjsonschema'

[s4m0r4m4]

Describe the bug

context When I try to build sphinx docs with myst-nb...

expectation I expected the docs to build.

bug But instead the following error is:

$ jupyter-book build mybook
Running Sphinx v6.2.1

Exception occurred:
  File "/root/.cache/pypoetry/virtualenvs/.../site-packages/nbformat/json_compat.py", line 12, in <module>
    import fastjsonschema
ModuleNotFoundError: No module named 'fastjsonschema'

problem It looks like ipython may now need the [notebook] add-in so that the fastjsonschema dependency is included by default: https://github.com/ipython/ipython/issues/5979

Would have to change this line: https://github.com/executablebooks/MyST-NB/blob/master/pyproject.toml#L40

Reproduce the bug

Set up a project with the following dependencies:

[tool.poetry]
...

[[tool.poetry.source]]
name = "PyPI"
priority = "primary"

[tool.poetry.dependencies]
python = "^3.8"
python-dotenv = "^0.20.0"
requests = "^2.28.1"
pandas = ">1.4.3, <3.0.0"
pathlib = "^1.0.1"
openpyxl = "^3.0.10"
plotly = "^5.11.0"
deprecation = "^2.1.0"
isort = "^5.12.0"
typing-extensions = "^4.7.1"

[tool.poetry.group.dev.dependencies]
black = "^22.6.0"
coverage = "^6.4.2"
mypy = "1.5.0"
pytest = "^7.1.2"
pytest-cov = "^3.0.0"
pylint = "^2.14.5"
taskipy = "^1.10.2"
types-requests = "^2.31.0.2"
types-urllib3 = "^1.26.23"
ipykernel = "^6.23.1"
pytest-xdist = "^3.3.1"
# add dev dependencies with `poetry add --dev` command

[tool.poetry.group.docs]
optional = true

[tool.poetry.group.docs.dependencies]
sphinx = "^6.2.1"
myst-parser = "^1.0.0"
sphinx-autobuild = "^2021.3.14"
sphinx-autodoc-typehints = "^1.12.0"
sphinx-multiversion = "^0.2.4"
sphinx-rtd-theme = "^1.3.0"
myst-nb = {version = "^1.0.0", python = "^3.9"}

[build-system]
requires = ["poetry-core>=1.0.0"]
build-backend = "poetry.core.masonry.api"

[tool.taskipy.tasks]
get_latest_version = "git tag -l --sort=creatordate |grep -Eo '^[0-9]{1,}.[0-9]{1,}.[0-9]{1,}$' |tail -1"
build_docs = "(export LATEST_RELEASE_TAG=$(task get_latest_version); sphinx-multiversion docs build/html)"
docs = "sphinx-autobuild docs docs/_build/html --watch src"

Run task docs and see the error.

List your environment

No response

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