A python script to pull data about your current game participants from Riot Games API.

league.py

#!python

import requests
import os
import json
import sys

from prettytable import PrettyTable

apiKey="YOUR_KEY"

name= "The Duck Of Doom" if len(sys.argv) <= 1 else sys.argv[1]
region="euw1" if len(sys.argv) <= 2 else sys.argv[2]
baseUrl=f"https://{region}.api.riotgames.com/lol"

# settings for ddragon to get champion info from
version="9.6.1"
locale="en_GB"
ddragonUrl=f"http://ddragon.leagueoflegends.com/cdn/{version}/data/{locale}/championFull.json"
championData = {}

def main():
    loadChampionData()

    summonerId = getSummonerId(name);
    if not summonerId: print(f"Can't find summoner id for name '{name}'"); exit()

    currentGameInfo = getCurrentGameInfo(summonerId);
    if not currentGameInfo: print(f"No active game info for player '{name}' on '{region}'"); exit()

    participants =  currentGameInfo['participants']

    table = PrettyTable()
    table.title = f'Current game for {name}:'
    table.field_names = ["Me", "Name", "Champion", "Mastery", "League", "LP", "W / L"]
    table.align["Name"] = "l"
    table.align["Champion"] = "l"
    table.align["Mastery"] = "r"
    table.align["League"] = "l"

    def formatThousands(i):
        s = str(i)
        v = ""
        for i, c in enumerate(reversed(s)):
            v += c
            if i != len(s) - 1 and (i + 1) % 3 == 0:
                v += " "

        return "".join(list(reversed(v)))


    for i, participant in enumerate(sorted(participants, key=lambda x: x['teamId'])):
        summonerId = participant['summonerId']
        (champion, points) = getChampionInfo(summonerId, participant['championId'])
        leagueInfo = getLeagueInfo(summonerId)
        summonerName = participant['summonerName']
        if leagueInfo:
            tier = leagueInfo['tier']
            rank = leagueInfo['rank']
            wins = leagueInfo['wins']
            losses = leagueInfo['losses']
            lp = leagueInfo['leaguePoints']
        else:
            tier = "Unranked"
            rank = ""
            wins = 0
            losses = 0
            lp = 0

        table.add_row(["X" if summonerName == name else " ", summonerName, champion, f"{formatThousands(points)} pts.", f"{tier} {rank}", f"{lp} LP", f"{wins} / {losses} "])
        if i == 4: 
            table.add_row([""] * 7)

    print(table)

def makeRequest(url, params={}):
    params['api_key'] = apiKey
    combinedUrl=f"{baseUrl}{url}"
    result = requests.get(combinedUrl, params=params).json()
    if 'status' in result:
        status = result['status']['status_code']
        if status == 404:
            print(f"Request {combinedUrl} returned with status code code 404:\n{result}")
            return None

        if status == 403:
            print(f"Request {combinedUrl} returned with status code code 403:\n{result}")
            return None

    return result

def loadChampionData():
    global championData

    filename="champions.json"
    if os.path.exists(filename):
        with open(filename) as f:
            championData = json.load(f)
        return

    data = requests.get(ddragonUrl).json()['data']
    for k, v in data.items():
        championData[v['key']] = v['id']

    with open(filename, 'w') as f:
        f.write(json.dumps(championData))

def getSummonerId(summonerName):
    sumInfo = makeRequest(f"/summoner/v4/summoners/by-name/{summonerName}")
    if sumInfo: return sumInfo['id']

def getCurrentGameInfo(summonerId):
    return makeRequest(f"/spectator/v4/active-games/by-summoner/{summonerId}");

def getChampionInfo(summonerId, championId):
    masteryInfo = makeRequest(f"/champion-mastery/v4/champion-masteries/by-summoner/{summonerId}/by-champion/{championId}");
    if masteryInfo:
        points = masteryInfo['championPoints']
    else:
        points = -1

    return (championData[str(championId)], points)

def getLeagueInfo(summonerId):
    entries = makeRequest(f"/league/v4/entries/by-summoner/{summonerId}")
    if entries:
        return next((x for x in entries if x['queueType'] == 'RANKED_SOLO_5x5'), None)

main()