PYTHONPATH first element not used in jupyter preview

[jordansamuels]

This bug appears related to the change in #4489 . That change uses sys.path[1:] , but this means that the first element of the path is omitted. This causes import issues in panel preview when importing a file from the first element of the PYTHONPATH. Moreover, if I locally change to sys.path instead of sys.path[1:] in panel/io/jupyter_server_extension.py then it fixes the issue.

ALL software version info

• panel=1.4.4=pyhd8ed1ab_0
• python=3.11.9=h932a869_0_cpython
• jupyterlab=4.2.3=pyhd8ed1ab_0

Tested on OSX and Linux.
Full software versions in repro here.

Description of expected behavior and the observed behavior

Full repro instructions at https://github.com/jordansamuels/panel-jupyter-path-bug-repro.
Expected: panel preview works in jupyter lab.
Observed: import exception.

Complete, minimal, self-contained example code that reproduces the issue

Full repro at https://github.com/jordansamuels/panel-jupyter-path-bug-repro.

Stack traceback and/or browser JavaScript console output

(none relevant that I could find)

Screenshots or screencasts of the bug in action

• I may be interested in making a pull request to address this

[MarcSkovMadsen]

Hi @jordansamuels

Thanks for the well described bug report. You could try to make the PR by just changing sys.path = [os.getcwd()] + sys.path[1:] to sys.path = [os.getcwd()] + sys.path.

As there is no test or documentation of the change in 4489, then Philipp would be the only one knowing why it was [1:] anyways and he would be able to quickly pick up and adjust your PR if needed.

[jordansamuels]

[...] You could try to make the PR by just changing sys.path = [os.getcwd()] + sys.path[1:] to sys.path = [os.getcwd()] + sys.path.

Thanks! I made PR #7059 for this. This is my first PR for this repo, so please let me know if I can adjust anything.