判断给定Python文件操作代码的输出结果是否为'789\n456'

执行以下Python代码后，输出的结果是 '789\n456'，请判断该表述是否正确：

with open('test.txt', 'w') as f:
  f.write('123\n456')
with open('test.txt', 'r+') as f:
  f.seek(0, 2)
  f.write('789')
  f.seek(0)
  print(repr(f.read()))