PyQt: QThread: утечка памяти

# -*- coding: utf-8 -*-
 
from PyQt4 import QtCore, QtGui
import sys
 
class MyThread(QtCore.QThread):
    def __init__(self, parent, n):
        QtCore.QThread.__init__(self)
        self.parent_ = parent
        self.n = n
        #self.connect(self, QtCore.SIGNAL("finished()"), self, QtCore.SLOT("deleteLater()")) - а если раскоментить - с криками """QThread::wait: Thread tried to wait on itself QThread: Destroyed while thread is still running""" падает
 
    def run(self):
        print self.n
        self.emit(QtCore.SIGNAL("signalMyThread(PyQt_PyObject)"), {'result': 'ok', 'n': self.n})
 
 
class Application(QtGui.QApplication):
    def __init__(self, argv):
        QtGui.QApplication.__init__(self, argv)
        self.prepare()
 
    def prepare(self):
        self.threads_ = {}
        self.working_threads = 0
        self.n = -1
        for x in xrange(50):
            QtCore.QTimer().singleShot(100, self.start)
 
    def start(self):
        self.n += 1
        if self.n > 1000000000:
            QtCore.QTimer().singleShot(100, self.finish)
            return
        n = self.n
        QtCore.QTimer().singleShot(100, lambda: self.start2(n))
 
    def start2(self, n):
        self.threads_[n] = MyThread(self, n)
        self.threads_[n].moveToThread(self.threads_[n])
        self.connect(self.threads_[n], QtCore.SIGNAL("signalMyThread(PyQt_PyObject)"), self.receive)
        self.working_threads += 1
        self.threads_[n].start()
 
    def receive(self, result):
        n = result.get('n')
        QtCore.QTimer().singleShot(100, lambda: self.killThread(n))
        QtCore.QTimer().singleShot(100, self.start)
 
    def killThread(self, n):
        if n not in self.threads_:
            return
        if self.threads_[n].isRunning():
            QtCore.QTimer().singleShot(100, lambda: self.killThread(n))
            return
        self.threads_[n].deleteLater()
        self.threads_.pop(n, None)
        self.working_threads -= 1
 
    def finish(self):
        if self.working_threads > 0:
            QtCore.QTimer().singleShot(100, self.finish)
            return
 
        self.quit()
 
 
if __name__=='__main__':
    app = Application(sys.argv)
    sys.exit(app.exec_())

self.threads_[n].moveToThread(self.threads_[n])

thread_ = QtCore.QThread()
self.threads_[n].moveToThread(thread_)
self.threads_[n].connect(self, QtCore.SIGNAL("finished()"), thread_.quit)
thread_.connect(self, QtCore.SIGNAL("started()"), self.threads_[n].run)
thread_.start()