import sys
from PyQt4 import QtGui, QtCore

class FooThread(QtCore.QThread):

    def __init__(self, foo):
        super(FooThread, self).__init__()
        self.foo = foo

    def run(self):
        print self.foo

def main():

        app = QtGui.QApplication(sys.argv)
        foo_thread = FooThread('foo')
        foo_thread.start()
        foo_thread.finished.connect(QtGui.qApp.exit)
        sys.exit(app.exec_())


if __name__ == '__main__':
    main()