NSConcreteMapTable autoreleased with no pool in place at user input

import sys
import threading
from PySide.QtCore import *
from PySide.QtGui import *
from PySide.QtUiTools import QUiLoader

app = QApplication(sys.argv)

loader = QUiLoader()
file = QFile("./mainwindow.ui")
file.open(QFile.ReadOnly)
myWidget = loader.load(file)
file.close()

btn = myWidget.findChild(QPushButton,"btn")
btn.setText("Knopfi :)")
myWidget.show()

class MyThread ( threading.Thread ):
    def run (s):
        while(True):
            button = raw_input()
            btn.setText(button)
            sys.stdout.write(button)
            sys.stdout.flush()

myThread = MyThread ()
myThread.start()

app.exec_()