Get steam games shared between accounts using custom urls/steamID64s. Requires https://pypi.org/project/steam/ and an API key, found at https://steamcommunity.com/dev/apikey.

get_games.py

#!/usr/bin/env python3

from os import environ, path
from sys import argv

from steam.steamid import SteamID
from steam.webapi import WebAPI


def get_api():
    if path.exists("./apiKey.txt"):
        with open("./apiKey.txt", "rt") as file:
            api_key = file.read().replace("\n", "")
    elif environ.get("STEAM_API_KEY") is not None:
        api_key = environ["STEAM_API_KEY"]
    else:
        api_key = input("Steam API Key> ")

    return WebAPI(api_key)


def get_apps_list():
    return {
        game["appid"]: game["name"]
        for game in API.call("ISteamApps.GetAppList")["applist"]["apps"]
    }


def gather_ids():
    if len(argv) == 1:
        print(
            "Type custom URL values or steam ID64s with line separation, to end the list input a blank line"
        )
        ids = list()
        current_id = "null"

        while current_id != "":
            current_id = input("> ")
            ids.append(current_id)
    else:
        ids = argv[1:]

    for userid in ids:
        try:
            yield SteamID(int(userid, 10))
        except ValueError:
            yield SteamID.from_url(f"https://steamcommunity.com/id/{userid}")


def get_user_games(steamid):
    result = API.call(
        "IPlayerService.GetOwnedGames",
        steamid=steamid,
        include_appinfo=False,
        include_played_free_games=True,
        appids_filter=0,
        include_free_sub=False,
    )

    return {game["appid"] for game in result["response"]["games"]}


API = get_api()
APPS_LIST = get_apps_list()

if __name__ == "__main__":
    users = gather_ids()
    libraries = map(get_user_games, users)
    games = sorted(
        APPS_LIST.get(appid) for appid in set.intersection(*libraries)
        if appid in APPS_LIST)

    print("\n".join(games))