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flake8-nb

flake8 checking for jupyter notebooks.

This tool is mainly aimed towards writing tutorials/lecture material, where one might also want to show off bad practices and/or errors, while still keeping the rest of the code clean and without adding the complexity of tooling to the readers (see docs on cell tags).

Basically this is a hack on the flake8's Application class, which adds parsing and a cell based formatter for *.ipynb files.

This is NOT A PLUGIN but a stand alone CLI tool/pre-commit hook to be used instead of the flake8 command/hook.

Features

• flake8 CLI tests for jupyter notebooks
• Full base functionality of flake8 and its plugins
• Input cell based error formatting (Execution count/code cell count/total cellcount)
• Report fine tuning with cell-tags (flake8-noqa-tags see usage)
• pre-commit hook

Examples

Default reporting

If you had a notebook with name example_notebook.ipynb, where the code cell which was executed as 34th cell (In[34]) had the following code:

bad_formatted_dict = {"missing":"space"}

running flake8_nb would result in the following output.

Execution count

$ flake8_nb example_notebook.ipynb
example_notebook.ipynb#In[34]:1:31: E231 missing whitespace after ':'

Custom reporting

If you prefer the reports to show the cell number rather then the execution count you can use the --notebook-cell-format option, given that the cell is the 5th code cell and 10th total cell (taking raw and markdown cells into account), you will get the following output.

Code cell count

$ flake8_nb --notebook-cell-format '{nb_path}:code_cell#{code_cell_count}' example_notebook.ipynb
example_notebook.ipynb:code_cell#5:1:31: E231 missing whitespace after ':'

Total cell count

$ flake8_nb --notebook-cell-format '{nb_path}:cell#{total_cell_count}' example_notebook.ipynb
example_notebook.ipynb:cell#10:1:31: E231 missing whitespace after ':'

Similar projects

• nbQA: Run isort, pyupgrade, mypy, pylint, flake8, mdformat, black, blacken-docs, and more on Jupyter Notebooks

Contributors ✨

Thanks goes to these wonderful people (emoji key):

This project follows the all-contributors specification. Contributions of any kind welcome!