原因：没有停下项目的情况下，关闭IDE，或者是之前的项目没有停掉，又一次运行了本项目．
解决办法：前者很简单，杀死进程．后者更简单把正在run的项目停掉．
杀死进程的命令：
如果是查看本机所有的进行的进程：
ps aux # 用ps -A查看所有进程杀死进程：
kill -9 PID # PID是进程号,查看进程时会显示解决OSError: [Errno 98] Address already in use
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