Sched Timing Event Scheduler for the Python standard library

#-*-Coding:utf-8-*-
# Author: Beginner
__author__ = ' Administrator '
#py标准库之sched
Import time
Import sched# Timer Event Scheduler
#使用time来掌握当前时间, there is a delay to specify a time period
#调用time是不带任何参数的, returns the current number of times, delay to provide an integer argument,
#有延迟运行事件
"""
4 methods
1: Indicates the number of delays;
2: Priority value;
3: the function to invoke;
4: Tuple of function arguments
"""
#例1:
Sche=sched.scheduler (Time.time,time.sleep)
def print_event (Name,start):
Now=time.time ()
End=int (Now-start)
Print ' event:%s end=%s name=%s '% (Time.ctime (now), End,name)
Start=time.time ()
print ' Statr: ', Time.ctime (start)
Sche.enter (2,1,print_event, (' first ', start)) #是2秒
Sche.enter (3,1,print_event, (' second ', start)) #3秒
Sche.run ()
#重叠事件
#run () calls are blocked, and even all events have been processed, and each event is run in the same purebred, so if an event takes a long time to run, the delay between events will overlap
#这个重叠可以通过推迟后面的事件来解决, such a move loses the event, but some events may be later than their dispatch time,
#例2
def longevent (name):
print ' 1event: ', Time.ctime (Time.time ()), name
Time.sleep (2)
print ' 2event ', Time.ctime (Time.time ()), name
print ' Start ', Time.ctime (Time.time ())
Sche.enter (2,1,longevent, (' first ',))
Sche.enter (3,1,longevent, (' second ',))
Sche.run ()
#当第一个事件一旦完成就会立即运行第二个事件 because the first event takes longer than the 2nd event, so it will exceed the start time of the second event

#事件优先级
#如果调度多个事件在同一个时间运行, use the priority of things to determine the order in which they will run
def yxevent (name):
print ' event ', Time.ctime (Time.time ()), name
Now=time.time ()
print ' Start: ', Time.ctime (now)
Sche.enter (2,1,yxevent, (' first ',))
Sche.enter (3,1,yxevent, (' second ',))
Sche.run ()

#取消事件
#enter () and Enterabs () will return a reference to an event that can be used later to cancel the event, which must be canceled in a different thread due to the block of Run ()
Import threading
Count=0
def count1 (name):
Global Count
print ' event ', Time.ctime (Time.time ()), name
Count+=1
print ' Now: ', count
print ' Start: ', Time.ctime (now)
A1=sche.enter (2,1,count1, (' A1 ',))
A2=sche.enter (3,1,count1, (' A2 ',))
T=threading. Thread (Target=sche.run)
T.start ()
Sche.cancel (A1)
T.join ()
print ' final: ', Count

#这边调用了2个事件, but the first one is then canceled and only the second event is run, so the count variable increments only once

#sched官方标准库: https://docs.python.org/2.7/library/sched.html?highlight=sched#module-sched

Sched Timing Event Scheduler for the Python standard library