Xshell正编辑文件时掉线，需再次正常编辑解决办法

E325: ATTENTION
Found a swap file by the name ".weather.py.swp"
          owned by: pi   dated: Mon Nov 19 14:09:33 2018
         file name: ~pi/robot/robot/views/weather.py
          modified: YES
         user name: pi   host name: Yan_7152
        process ID: 1338
While opening file "weather.py"
             dated: Mon Nov 19 14:03:17 2018

(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 weather.py"
    to recover the changes (see ":help recovery").
    If you did this already, delete the swap file ".weather.py.swp"
    to avoid this message.

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

做法：ls -a，然后再删除掉.filename（你上次未保存的文件名）.swp文件