import time
from PyQt4 import QtCore


class A(QtCore.QObject):
    mySignal = QtCore.pyqtSignal(str)
    def __init__(self):
        QtCore.QObject.__init__(self)
        self.b = B(self)
        self.b.start()

    def some_action(self):
        self.mySignal.emit("Hello World")
        
class B(QtCore.QThread):
    def __init__(self, creator):
        QtCore.QThread.__init__(self)
        self._creator = creator
        self._creator.mySignal.connect(self.mySlot)

    def mySlot(self, str):
        print str

    def run(self):
        while True:
            print 'tick'
            time.sleep(1)

def some_func():
    a = A()
    #a.create_b()
    a.some_action()
    time.sleep(2)
    a.some_action()
    a.some_action()

some_func()
time.sleep(3)