set timeout in python

set-timeout.py

import heapq
import time


class runtime:
    def __init__(self):
        self.heap = []

    def setTimeout(self, fn, timeout):
        exp = time.time() + timeout
        heapq.heappush(self.heap, (exp, fn))

    def run(self):
        while len(self.heap) > 0:
            print time.time()
            if time.time() > self.heap[0][0]:
                exp, fn = heapq.heappop(self.heap)
                fn()

            time.sleep(1)


def _10():
    print 10
    r.setTimeout(_3, 3)


def _3():
    print 3
    pass


r = runtime()
r.setTimeout(_10, 10)
r.run()