Messy code but it creates a list with user's messages stats from a telegram group's exported json file

Telegram-groupchat-stast.py

import json
from collections import namedtuple


class person:
    def __init__(self, _id, username):
        self.id = _id
        self.username = username
        self.msgs_len = []

    def add_msg(self, msg):
        m = []

        def recmsg2text(raw):
            if isinstance(raw, str):
                m.append(raw)
            if isinstance(raw, list):
                for item in raw:
                    recmsg2text(item)
            if isinstance(raw, dict):
                for key in raw:
                    if key == "text":
                        m.append(raw[key])

        recmsg2text(msg)
        self.msgs_len.append(len(" ".join(m)))

    def __hash__(self):
        return self.id


def id2int(_id):
    return int(_id.replace("user", "").replace("channel", ""))


def main():
    people = {}
    with open("result.json", "r") as f:
        js = json.load(f)
        for msg in js["messages"]:
            if msg["type"] == "message":
                _id = id2int(msg["from_id"])
                if not people.get(_id, False):
                    p = person(_id, msg["from"])
                    people[_id] = p
                people[_id].add_msg(msg["text"])

    prsn = namedtuple("person", ["username", "messages", "average_len", "median_len"])
    res = [
        prsn(
            person.username,
            len(person.msgs_len),
            int(sum(person.msgs_len) / len(person.msgs_len)),
            sorted(person.msgs_len)[len(person.msgs_len) // 2],
        )
        for _id, person in people.items()
    ]
    st = sorted(res, key=lambda o: o.messages)

    print(*st, sep="\n")


if __name__ == "__main__":
    main()