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sched可用于定时任务，唯一需要注意的就是，这些任务在一个线程中运行，如果前面的任务耗时过长，则后面的任务将顺延执行。
但其使用方法还是很简单的，主要封装了一个类scheduler
import sched import time def printName(name): print(name,"@",time.time()) s =
sched.scheduler() s.enter(5,1,printName,("5 - 1",)) s.enter(5,2,printName,("5 -
2",)) s.enter(10,1,printName,("10 - 1",)) s.run()
其中，enter为s中添加事件，其前两个参数分别代表延时时长和任务执行顺序；printName为将要执行的函数，("5-1",)
为参数列表，表示第5s执行的第一个任务。
其执行结果如下
5 - 1 @ 1649725436.606954 5 - 2 @ 1649725436.6229577 10 - 1 @
1649725441.6388779
如果在函数中加一个延时，则后面的任务将顺延
def printName(name): print(name,"@",time.time()) time.sleep(6)
其输出结果为
5 - 1 @ 1649725617.7624931 5 - 2 @ 1649725623.7689147 10 - 1 @
1649725629.7827168
与enter相对的是cancel(evt)和empty，前者可以删除某个事件，后者可以清空所有事件。
如果配合thread使用，则可以解决sched阻塞的问题。
import sched import threading import time def printNameByThread(name):
threading.Thread(target=printName,args=[name]).start() s = sched.scheduler() s.
enter(5,1,printNameByThread,("5 - 1",)) s.enter(5,2,printNameByThread,("5 - 2",)
) s.enter(10,1,printNameByThread,("10 - 1",)) s.run()
其输出结果为
5 - 1 @ 1649725777.2276525 5 - 2 @ 1649725777.2276525 10 - 1 @
1649725782.2158542
所以，熟练使用thread和sched，就可以安排定时任务了。
