[BUG] This doesn't seem to work for the %run magic command

[jencake]

For variables are defined in another notebook and imported via %run. flake8_nb still gives me the variable is undefined error.

[s-weigand]

@jencake This is a general limitation when using jupyter magic syntax that manipulates the ipython kernel state at runtime and using static linters.
The problem is that magic commands aren't regular python code, so it does not translate to the equivalent python AST that flake8 uses to lint code.
The only way to fix this would require flake8 to use a different AST parser that supports jupyter magic syntax, which I'm not aware even exists and even if I don't see flake8 changing to it.

Pretty much the same issue was opened and closed for nbQA and I have the same suggestion as @MarcoGorelli to use # noqa either as comment inline or via cell tags.

The other way to solve this would be to convert the notebook you run with %run to a python file and use regular imports.