Launch PyQt4 with tornado

gistfile1.py

import tornado.ioloop
import tornado.autoreload
from PyQt4 import QtGui
import sys

class Window(QtGui.QWidget):
    def __init__(self):
        super(Window, self).__init__()
        self.timer = tornado.ioloop.PeriodicCallback(self.printable, 300)
        self.timer.start()
    def closeEvent(self, event):
        tornado.ioloop.IOLoop.instance().stop()
    def printable(self):
        print 'hello, tornado!'

if __name__ == '__main__':
    import threading
    tornado.autoreload.start(io_loop=None, check_time=500)
    threading.Thread(target = lambda: tornado.ioloop.IOLoop.instance().start()).start()

    qapp = QtGui.QApplication(sys.argv)
    w = Window()
    w.show()
    sys.exit(qapp.exec_())