python 结合 schedule 和thread 实现触发式周期调用某函数（更新数据）

#! /usr/bin/env python
    # This Python file uses the following encoding: utf-8
'''
Created on Nov 18, 2013

@author: root
'''


from threading import Thread

import time, sched             
schedule = sched.scheduler(time.time, time.sleep)    
     
class test(Thread):
    
    time_available_flag=True
    opt=0
       
    def __init__(self):
        Thread.__init__(self)
         
    def perform_command(self, inc):           
        self.write_xml()
        
    def timming_exe(self, inc = 20):    
                   
        schedule.enter(inc, 0, self.perform_command, ( inc,))         
        
        schedule.run()    
        
    def write_xml(self):
        print('write xml to file opt %s'%test.opt)  
        test.time_available_flag=True  
        print("schedu finished",time.time())
        print('some func  called  here   ','opt  ------------,写入数据',self.__class__.opt)
        
    def run(self):
        print("schedu started",time.time())
        self.timming_exe()
                    
    def whether_write_xml(self,count):
        
#         print(time.time())
        if count>0:
            self.__class__.opt=self.__class__.opt+1
            print("time_available_flag",self.__class__.time_available_flag,self.__class__.opt)
            if self.__class__.time_available_flag:
                self.__class__.time_available_flag=False
                print("first start ",self.__class__.time_available_flag)
                self.start()
#                print(time.time())
#         print(time.time())
        return count  
if __name__ == '__main__':    
    x=test()
    print(x.whether_write_xml(1))
    
#     time.sleep(2)
    
    print(x.whether_write_xml(2))
#     time.sleep(3)
    print(x.whether_write_xml(3))
#     time.sleep(5)
    
    print(x.time_available_flag)
    
    xx=test()
    print(xx.whether_write_xml(4))
    print(xx.whether_write_xml(5))