Set pre-run python codes when open a notebook

Feature Request 1 (already supported) Allow local file path in piplite_urls, so I can cache my private python package.

Feature Request 2 Run python codes defined in config everytime I opened a new notebook. This can be really good for cutomization, like pre-install some packages, ignore uncessary warnings, …

If you think these requests are resonable, I can help file a PR.

[martinRenou]

Supporting the IPython config would be nice indeed! Because we already use IPython it could possibly be done.

On another note, there is a PR related to this issue in replite: https://github.com/jtpio/replite/pull/24

[psychemedia]

Idly wondering about “JupyterLite-Binder” or “repo2jupyterlite” Github Action that could create a JupyterLite distribution from the contents of a repository and then publish it to Github pages, I note the repo2docker/configuration and repo2docker/config_files docs:

File	Relevant to JupyterLite?	comments
environment.yml	N/A?	are there conda recipes for pyodide? Other WASM kernel feedstocks?
Pipfile and/or Pipfile.lock	?	pipenv config file; a jupyterlite distribution is essentially an environment
requirements.txt	Y	Install a Python environment
setup.py	Y	Install Python packages; eg if the repo defines a package and the distribution is demonstrating it
Project.toml	Not yet?	Install a Julia environment; is there likely to be a jupyterlite Julia kernel (J in Jupyter suggests there should be…)
install.R	mid-term?	Install an R/RStudio environment ; POC R-WASM build available, kernel at some point?
apt.txt	N/A ?	Install packages with apt-get
DESCRIPTION	mid-term?	Install an R package ; POC R-WASM build available, kernel at some point?
postBuild	?	Run code after installing the environment; eg run code in sense of the Github action? Moving files etc? Gives CLI access to Action runner over and above jupterlite-build command
start	N?	In Binder sense, this is run at command-line level; is there a JupyterLite corollary?
runtime.txt	Y?	Specifying runtimes; eg specifying particular pyolite versions?
default.nix	N/A?	the nix package manager; but maybe other custom package managers are relevant
Dockerfile	?	Advanced environments; this could still be supported for custom builds

I also note that IPython supports environment configuration (IPython/config):

# sample ipython_config.py
# JSON format also supported

c.TerminalIPythonApp.display_banner = True
c.InteractiveShellApp.log_level = 20
c.InteractiveShellApp.extensions = [
    'myextension'
]
c.InteractiveShellApp.exec_lines = [
    'import numpy',
    'import scipy'
]
c.InteractiveShellApp.exec_files = [
    'mycode.py',
    'fancy.ipy'
]
c.InteractiveShell.colors = 'LightBG'
c.InteractiveShell.xmode = 'Context'
c.TerminalInteractiveShell.confirm_exit = False
c.TerminalInteractiveShell.editor = 'nano'

As already noted, IPython also supports startup files and it might make sense for a JupyterLite environment to support something similar, although perhaps with a warning (“Enable startup files: Y/N”) on first load:

If you want some code to be run at the beginning of every IPython session, the easiest way is to add Python (.py) or IPython (.ipy) scripts to your profile_default/startup/ directory. Files here will be executed as soon as the IPython shell is constructed, before any other code or scripts you have specified. The files will be run in order of their names, so you can control the ordering with prefixes, like 10-myimports.py.