Click: override default options with config file(s)

conf.ini

[test]
count = 2

conf.py

import configobj
import click

_missing = object()


class ConfGroup(click.Group):

    def __init__(self, *config_files, **kwargs):
        self.config_files = [configobj.ConfigObj(f) for f in config_files]
        click.Group.__init__(self, **kwargs)

    def get_command(self, ctx, cmd_name):
        rv = click.Group.get_command(self, ctx, cmd_name)
        if rv is not None:
            for p in rv.params:
                opt = self._get_option(rv.name, p.name)
                if opt is not _missing:
                    p.default = opt
            return rv

    def _get_option(self, section, param):
        option = _missing
        for conf in self.config_files:
            if section in conf:
                option = conf[section].get(param, _missing)
        return option


cli = ConfGroup('conf.ini')


@cli.command()
@click.option('--count', default=1)
def test(count):
    print 'option', count


if __name__ == '__main__':
    cli()