Support debugging Jupyter notebook cells

[coatless]

Positron Version:

Steps to reproduce the issue:

1. Open a new Jupyter Notebook for Python
2. Create the subtract function and its call inside of a cell

def subtract(a, b):
    diff = a - b
    return diff

subtract(1, 2)

3. Click on the left of diff line to insert a breakpoint
4. Try running the debugger
5. Attempt to advance the line
6. Receive error in Terminal

Debugger open in Notebook with breakpoint

Debugger options

What did you expect to happen?

The Python debugger should have displayed the call stack

Were there any error messages in the output or Developer Tools console?

(ds) (base) ➜  Positron-Python  cd /Users/ronin/PositronVideos/Positron-Python ; /usr/bin/env /opt/
miniconda3/envs/ds/bin/python /Users/ronin/.positron/extensions/ms-python.debugpy-2024.6.0-darwin-a
rm64/bundled/libs/debugpy/adapter/../../debugpy/launcher 52971 -- /Users/ronin/PositronVideos/Posit
ron-Python/jupyter-debugger-demo.ipynb 
Traceback (most recent call last):
  File "/opt/miniconda3/envs/ds/lib/python3.12/runpy.py", line 198, in _run_module_as_main
    return _run_code(code, main_globals, None,
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/miniconda3/envs/ds/lib/python3.12/runpy.py", line 88, in _run_code
    exec(code, run_globals)
  File "/Users/ronin/.positron/extensions/ms-python.debugpy-2024.6.0-darwin-arm64/bundled/libs/debugpy/adapter/../../debugpy/launcher/../../debugpy/__main__.py", line 39, in <module>
    cli.main()
  File "/Users/ronin/.positron/extensions/ms-python.debugpy-2024.6.0-darwin-arm64/bundled/libs/debugpy/adapter/../../debugpy/launcher/../../debugpy/../debugpy/server/cli.py", line 430, in main
    run()
  File "/Users/ronin/.positron/extensions/ms-python.debugpy-2024.6.0-darwin-arm64/bundled/libs/debugpy/adapter/../../debugpy/launcher/../../debugpy/../debugpy/server/cli.py", line 284, in run_file
    runpy.run_path(target, run_name="__main__")
  File "/Users/ronin/.positron/extensions/ms-python.debugpy-2024.6.0-darwin-arm64/bundled/libs/debugpy/_vendored/pydevd/_pydevd_bundle/pydevd_runpy.py", line 321, in run_path
    return _run_module_code(code, init_globals, run_name,
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/ronin/.positron/extensions/ms-python.debugpy-2024.6.0-darwin-arm64/bundled/libs/debugpy/_vendored/pydevd/_pydevd_bundle/pydevd_runpy.py", line 135, in _run_module_code
    _run_code(code, mod_globals, init_globals,
  File "/Users/ronin/.positron/extensions/ms-python.debugpy-2024.6.0-darwin-arm64/bundled/libs/debugpy/_vendored/pydevd/_pydevd_bundle/pydevd_runpy.py", line 124, in _run_code
    exec(code, run_globals)
  File "/Users/ronin/PositronVideos/Positron-Python/jupyter-debugger-demo.ipynb", line 14, in <module>
    "execution_count": null,
                       ^^^^
NameError: name 'null' is not defined

[seeM]

Thanks for the report! We haven't yet hooked up the debugger for Jupyter notebook cells, we can use this issue to track that work.

I think what's happening in your case is that the Python debugger is trying to treat this .ipynb file as a .py file, which won't work. We'll need to setup debugging for Jupyter notebook cells specifically.