ZoneInfo('UTC') doesn't work on Jupyterlite v0.1.0b17 demo

[stonebig]

Problem

I would like this to work

from zoneinfo import ZoneInfo
utc = ZoneInfo('UTC')

currently it crashes,

the fix proposed here doesn't seem to be in effect emscripten-forge/empack#53

whished result

[jtpio]

Thanks @stonebig for the report.

This might actually be an issue with Pyodide. The full traceback shows the following:

Which looks similar to the error when using the Pyodide console directly:

[agriyakhetarpal]

xref pyodide/pyodide#4668 for the discussion on the Pyodide side – as this is a constraint with CPython, which itself mentions that it falls back to tzdata: https://docs.python.org/3/library/zoneinfo.html#module-zoneinfo.

Sometime later after that, we added a custom error message around this:

ZoneInfoNotFoundError: "No time zone found with key UTC. On Pyodide you must do pyodide.loadPackage('tzdata') package before you use zoneinfo."

which makes things clearer, I hope.

As mentioned, installing tzdata beforehand

%pip install tzdata
from zoneinfo import ZoneInfo
utc = ZoneInfo('UTC')
utc # zoneinfo.ZoneInfo(key='UTC')  

in a JupyterLite REPL works for me.