Clock class

import time

class Clock(object):
    def __init__(self):
        self.myTime = time.time()
    def tick(self, secs=1):
        while time.time() <= secs + self.myTime:
            pass
        self.myTime = time.time()

def main():
    myClock = Clock()
    for i in xrange(10):
        z = time.time()
        print z,'\t', i*0.25,
        time.sleep(i*0.25)
        myClock.tick()
        print '\t', time.time(), '\t', time.time() - z

if __name__ == '__main__':
    main()