
 Example

    #test.py
    from pytasks import App
    from datetime import datetime as dt
    from datetime import timedelta as td
    class T:
        def __init__(self, taskid):
            self.times = 10    #<--------------the largest number of this task will be executed
            self.now = dt.now()
            self.every = td(seconds=4)  #<------frequency of task being polled
            self.taskid = taskid
        def __call__(self):    #<--------------content of task
            print self.taskid, ":", dt.now()-self.now
            self.now =dt.now()
        def schedule(self):    #<--------------task'schedule：
            return dt.now()+td(seconds=2)         #return bool() or datetime.datetime(...)[means the time to run task]
    task1 = T(1)                                   
    task2 = T(2)
    #set task2's schedule
    task2.schedule = lambda: True if os.environ['LOGNAME']=='root' else False
    app = App()
    app.add(task1)
    app.add(task2
    app.run()

