判断执行给定Python文件操作代码后，输出结果是否为'789\n456'
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()))
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