wather for forked thread

wather.py

class Watcher:
    def __init__(self):
        self.child = os.fork()
        print 'child', self.child
        if self.child == 0:
            return
        self.watch()

    def watch(self):
        try:
            os.wait()
        except KeyboardInterrupt as why:
            self.kill()
        sys.exit()

    def kill(self):
        try:
            os.kill(self.child, signal.SIGKILL)
        except OSError as why:
            print why