为什么不更新文件?

我得到了这个功能:

  def restapuntos(precio, usuario ,saladondeocurre):
    print("Function started")
    data = []
    with open("listas\estadisticas\Trivial-"+saladondeocurre+".txt", "r+") as f:
      for line in f:
        data_line = json.loads(line)
        if data_line[0] == usuario:
          print("User: "+user.name+", removing "+str(precio)+" from "+str(data_line[1]))
          data_line[1] = data_line[1]-precio
        data.append(data_line)
      f.seek(0)
      f.writelines(["%s\n" % json.dumps(i) for i in data])
      f.truncate()
    print("Function has been used")

它被称为:

Myclass.restapuntos(10, user.name, room.name)

这3张照片告诉我:

Function started
User: saelyth, removing 10 from 461
Function has been used

但问题是:文件没有更新,它仍然显示461,而不是451,尽管一切看起来都很好,打印实际上知道该怎么做而没有错误,在我运行代码后,文件中的信息仍然和以前一样。

有人知道为什么吗?