[Python Argparse] Add groups to multi subparsers

argparse_hack_groups.py

# Explication => https://stackoverflow.com/a/70193244/12778808  

import argparse
import ctypes


parent_parser = argparse.ArgumentParser(description="Redacted")

subparsers = parent_parser.add_subparsers()

subparser_email = subparsers.add_parser("email", parents=[parent_parser], add_help=False)
subparser_gen = subparsers.add_parser("gen", parents=[parent_parser], add_help=False)

group_emails = subparser_email.add_argument_group("Main inputs")
group_gen = subparser_gen.add_argument_group("Emails generation")
group_matchers = parent_parser.add_argument_group("Matchers") # The group we want on each subparser

[...] # add the arguments to your groups here

def add_group_to_subparsers(group: argparse._ArgumentGroup, subparsers: argparse._SubParsersAction, name: str):
    for name, subparser in subparsers._name_parser_map.items():
        dummy_group = subparser.add_argument_group(name)
        ctypes.memmove(id(dummy_group), id(group), object.__sizeof__(dummy_group))

add_group_to_subparsers(group_matchers, subparsers, "Matchers")

parent_parser.parse_args()