KeyError (None, None) for v.nbformat_schema

[hongshanli23]

My nobebook test_papermill.ipynb looks like

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "tags": [
     "parameters"
    ]
   },
   "outputs": [],
   "source": [
    "alpha = 0.1\n",
    "beta = 0.2"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "print(alpha, beta)"
   ]
  }
 ],
 "metadata": {
  "celltoolbar": "Tags",
  "kernelspec": {
   "display_name": "Environment (conda_pytorch_p36)",
   "language": "python",
   "name": "conda_pytorch_p36"
  },
  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 3
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython3",
   "version": "3.6.10"
  }
 },
 "nbformat": 4,
 "nbformat_minor": 4
}

The first cell has a tag parameters. When I execute the following

papermill --help-notebook test_papermill.ipynb

I got the following error

Traceback (most recent call last):
File "/home/ubuntu/anaconda3/envs/pytorch_p36/bin/papermill", line 8, in
sys.exit(papermill())
File "/home/ubuntu/anaconda3/envs/pytorch_p36/lib/python3.6/site-packages/click/core.py", line 764, in call
return self.main(*args, **kwargs)
File "/home/ubuntu/anaconda3/envs/pytorch_p36/lib/python3.6/site-packages/click/core.py", line 717, in main
rv = self.invoke(ctx)
File "/home/ubuntu/anaconda3/envs/pytorch_p36/lib/python3.6/site-packages/click/core.py", line 956, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "/home/ubuntu/anaconda3/envs/pytorch_p36/lib/python3.6/site-packages/click/core.py", line 555, in invoke
return callback(*args, **kwargs)
File "/home/ubuntu/anaconda3/envs/pytorch_p36/lib/python3.6/site-packages/click/decorators.py", line 17, in new_func
return f(get_current_context(), *args, **kwargs)
File "/home/ubuntu/anaconda3/envs/pytorch_p36/lib/python3.6/site-packages/papermill/cli.py", line 237, in papermill
sys.exit(display_notebook_help(click_ctx, notebook_path, parameters_final))
File "/home/ubuntu/anaconda3/envs/pytorch_p36/lib/python3.6/site-packages/papermill/inspection.py", line 67, in display_notebook_help
nb = _open_notebook(notebook_path, parameters)
File "/home/ubuntu/anaconda3/envs/pytorch_p36/lib/python3.6/site-packages/papermill/inspection.py", line 19, in _open_notebook
return load_notebook_node(input_path)
File "/home/ubuntu/anaconda3/envs/pytorch_p36/lib/python3.6/site-packages/papermill/iorw.py", line 411, in load_notebook_node
nb_upgraded = nbformat.v4.upgrade(nb)
File "/home/ubuntu/anaconda3/envs/pytorch_p36/lib/python3.6/site-packages/nbformat/v4/convert.py", line 39, in upgrade
_warn_if_invalid(nb, from_version)
File "/home/ubuntu/anaconda3/envs/pytorch_p36/lib/python3.6/site-packages/nbformat/v4/convert.py", line 21, in _warn_if_invalid
validate(nb, version=version)
File "/home/ubuntu/anaconda3/envs/pytorch_p36/lib/python3.6/site-packages/nbformat/validator.py", line 276, in validate
relax_add_props=relax_add_props):
File "/home/ubuntu/anaconda3/envs/pytorch_p36/lib/python3.6/site-packages/nbformat/validator.py", line 298, in iter_validate
validator = get_validator(version, version_minor, relax_add_props=relax_add_props)
File "/home/ubuntu/anaconda3/envs/pytorch_p36/lib/python3.6/site-packages/nbformat/validator.py", line 69, in get_validator
schema_json = _get_schema_json(v, version=version, version_minor=version_minor)
File "/home/ubuntu/anaconda3/envs/pytorch_p36/lib/python3.6/site-packages/nbformat/validator.py", line 103, in _get_schema_json
schema_path = os.path.join(os.path.dirname(v.file), v.nbformat_schema[(None, None)])
KeyError: (None, None)

[cskaandorp]

I had the same problem! Upgrading the nbformat package solved the issue for me:

pip install nbformat --upgrade

[MSeal]

Ahh yes. I think we need to require the latest nbformat in papermill now. I'll add a min version to our requirements section.

[MSeal]

2.3.1 has the appropriate version requirement specified to avoid this error now