This little class can help create command line toolbox easily.

gistfile1.txt

import argparse
import logging
from enum import EnumMeta

logger = logging.getLogger(__name__)

class Blackmore:
    def __init__(self, name, functions):
        self.name = name
        self.functions = dict([[f.__name__, f] for f in functions])

    def execute(self):
        parser = argparse.ArgumentParser(prog = self.name)
        parser.add_argument("cmd", help="command", choices=self.functions.keys())
        args = parser.parse_known_args()
        cmd_name = args[0].cmd
        function = self.functions[cmd_name]
        args = self.get_args(parser, function)

        params = {}
        for k, v in function.__annotations__.items():
            params[k] = getattr(args, k)

        return function(*params.values())

    def get_args(self, parser, function):
        for k, v in function.__annotations__.items():
            if v is str:
                parser.add_argument(k, help=k)
            elif isinstance(v, EnumMeta):
                parser.add_argument(k, help=k, choices=v.__members__.keys())
            else:
                raise TypeError("Only support str")

        return parser.parse_args()

def hello(name: str):
    print(f"hello {name}")

from enum import Enum
class Color(Enum):
   RED= "red"
   BLUE = "blue"

def choose_color(color: Color):
   print(f"color {color} is chosen")

blackmore = Blackmore("My Commands", [hello, choose_color])

blackmore.execute()