Run a tagged function in python

execute_tagged.py

import argparse
import functools
import another


def tag(*name):
    def outer(func):
        func.tag = name

        @functools.wraps(func)
        def inner(*args, **kwargs):
            val = func(*args, **kwargs)
            print(f"{name}: {val}")
            return val

        return inner

    return outer


@tag("hello")
def hello(name="red"):
    return f"hello {name}"


def discover_tags(funcs, *tags):
    tagged_funcs = []
    for func in funcs:
        for tag in tags:
            if tag in (func_tag := getattr(func, "tag", None)):
                if func_tag:
                    tagged_funcs.append(func)
    return tagged_funcs


class CLI:
    """Access and show variables using the CLI."""

    def __init__(self, funcs):
        self.funcs = funcs

    def build_parser(self):
        parser = argparse.ArgumentParser(description="The strangely familiar CLI")

        # Add arguments.
        parser.add_argument("--tag", nargs="*", help="tag")

        return parser

    def error_handler(self, parser, args):
        # Deal with argument dependencies.
        pass

    def trigger_handler(self):
        parser = self.build_parser()
        args = parser.parse_args()
        return args

    def entrypoint(self):
        args = self.trigger_handler()
        tagged_funcs = discover_tags(self.funcs, *list(args.tag))
        if tagged_funcs:
            for func in tagged_funcs:
                func()


cli = CLI(funcs=(hello,))
cli.entrypoint()