Here, the log prints that the set_name method was called with the parameter Jack.
在这里，日志输出表明用参数Jack调用了set_name方法。
Once you have done this, use exit to get back to a loginprompt and log in as jack.
一旦发现有误操作，使用exit退回到登陆提示，并用jack登陆系统。
Jack: If you log in some formal websites, it must be very safe.
杰克：如果你登录的是正规网站，肯定很安全的。
Jack: : If you log in some formal websites, it must be very safe.
杰克：如果你登录的是正规网站，肯定很安全的。
Jack: : If you log in some formal websites, it must be very safe.
杰克：如果你登录的是正规网站，肯定很安全的。
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