解决Linux下vi或vim操作Found a swap file by the name

在linux下用vi或vim打开 文件时

E325: ATTENTION
Found a swap file by the name ".1.py.swp"
          owned by: liu   dated: Sat Apr 20 17:37:19 2019
         file name: ~liu/1.py
          modified: YES
         user name: liu   host name: localhost.localdomain
        process ID: 5059 (still running)
While opening file "1.py"
             dated: Sat Apr 20 17:52:21 2019
      NEWER than swap file!

(1) Another program may be editing the same file.  If this is the case,
    be careful not to end up with two different instances of the same
    file when making changes.  Quit, or continue with caution.
(2) An edit session for this file crashed.
    If this is the case, use ":recover" or "vim -r 1.py"
    to recover the changes (see ":help recovery").
    If you did this already, delete the swap file ".1.py.swp"
    to avoid this message.

Swap file ".1.py.swp" already exists!
[O]pen Read-Only, (E)dit anyway, (R)ecover, (Q)uit, (A)bort:

原因是在此次vi或vim操作前有过一次使用vi或vim 操作文件时出现了异常中断，所以在当前目录下产生了一个文件，这个文件使用ls命令查看不能发现，使用ls -a命令查看可以知道是一个隐藏文件。

注：以.开头的文件就是隐藏文件

想要不再有上面的警告提示，把该文件删除即可