Backward Compatibility with python 3.9

[Kushallodha]

After #326, Cobaya has become incompatible with Python<=3.9. I believe one of the reasons is due to the use of

commands = {}
for script in metadata.entry_points().select(group='console_scripts'):
        if script.name.startswith('cobaya-'):
            commands[script.name] = script.value
    help_msg = ("Add a one of the following commands and its arguments "
                "(`<command> -h` for help): %r" % list(commands))`

in cobaya/__main__.py. The metadata.entry_points() didn't have a select method in < v3.10. I am aware Python 3.9's full support ended in 2022, but it would be great if we could somehow maintain backward compatibility till the end of its lifetime (2025). I am unsure if this has already been discussed elsewhere or if the authors have decided to end Cobaya support for Python <=3.9.

[cmbant]

Thanks for the report. But you shouldn't need to use main - e.g. cobaya-run etc can be run directly (personally I never use the main version).

[Kushallodha]

I've been using main due to past issues with occasionally environmental variables and paths not being properly exported in job scripts. If directly calling console scripts resolves this, then it's not a significant concern.

[Kushallodha]

Is there a way to use debugging tools like pdb with console commands directly?

[cmbant]

I don't know, I always debug in pycharm.