Please specify (single) host string for connection:

No hosts found. Please specify (single) host string for connection:

在apscheduler中执行fabric的定时任务时：
正常的写法是这样的
scheduler.add_job(updataPicture.gettime, 'cron', day_of_week='0-6', hour=18, minute=15)
可是在时间到达的时候执行结果是这样的：
No hosts found. Please specify (single) host string for connection:
结果会让我从新输入主机名

通过查询在Stack Overflow上找了答案：

In order to get hosts to work in a script outside of the fab command-line tool and fabfile.py, you'll have to use execute():

from fabric.tasks import execute   
def mytask():   
    run('uname -a') 

results = execute(mytask)

这样的话主机就能够工做在脚本之外了，我在原有fabric文件中执行

def getlatestpics():
    execute(updatapic)

而后定时任务这样：

scheduler.add_job(updataPicture.getlatestpics, 'cron', day_of_week='0-6', hour=18, minute=15)

这样就能够很是完美的执行了