manage.py

import glob
import importlib
from os.path import basename, dirname, join

import click

#
# I have a module called `project.commands`. From time to time I create
# new click commands in a new submodule inside the module mentioned
# above. The idea here is to automagically load all the new commands
# added to `project.commands` submodules.
#
# project/
#     commands/
#         __init__.py
#         dumpdb.py
#         importdb.py
#         shell.py
#         reset_password.py
#
# Then you should be able to
#     $ python manage.py dumpdb --other-flags
#     $ python manage.py importdb --more-flags
#     $ python manage.py shell
#     $ python manage.py reset_password --user_id=1 --password "${PASSWORD}"
#

def load_commands() -> click.core.Command:
    from project import commands

    namespaces = [
        f"{commands.__package__}.{basename(file).rstrip('.py')}"
        for file in glob.glob(join(dirname(commands.__file__), "*.py"))
        if not file.endswith("__init__.py")
    ]

    comms = []
    for namespace in namespaces:
        module = importlib.import_module(namespace)
        comms.extend(
            [
                comm
                for comm in module.__dict__.values()
                if isinstance(comm, click.core.Command)
            ]
        )
    return comms


@click.group()
def cli():
    pass


if __name__ == "__main__":

    for command in load_commands():
        cli.add_command(command)

    cli()