用.txt Python 3中的最后一个条目覆盖

Question

我写这个是为了在OBS上播放玩家（在SC2中）和对手玩，但我只想玩最后一个游戏，我怎么能覆盖txt文件所以我只保留最后一个条目？

import requests;
import json;
import time;

def players():
    r = requests.get('http://localhost:6119/game/');
    sc2data = json.loads(r.content)
    player = sc2data['players']
    playersname = (player[0]['name'],player[0]['race'], " vs ",player[1]['name'],player[1]['race'])
    print(playersname)
    print(playersname, file=open("output.txt", "a"))
    time.sleep(15)
x = 1
while True:
    players()
    x+=1