Bound method as callback

sched_callback.py

import sched, time

class O(object):
    def __init__(self, name):
        self.name = name
    def print_time(self):
        print("({}): From print_time {}".format(self.name, time.time()))
    def entry(self):  
        s = sched.scheduler(time.time, time.sleep)
        s.enter(2, 1, self.print_time, ())
        s.run()

runner = O('runner')
runner.entry()

# Output:
# (runner): From print_time 1412821256.22