PyQt how to send signals from Qthread to change the GUI from the main thread?

ok now i'v been searching alot until i have finally understood how QThread works with signals to change the GUI from the main thread and actually it is pretty easy and simple.....

first we know that QT have modules we need to use QtCore that have Qt objects like thread and signals and QtGui that have GUI objects

now we have this code :

#! /usr/bin/python

# -*- coding : utf-8 -*-

from PyQt4 import QtGui, QtCore

import time, sys

gui=QtGui.QApplication.processEvents #a function we use to make sure that the gui wont freeze

class display():#first we make a class that handle the gui object

    texttoset=""

    app=QtGui.QApplication(sys.argv) #we make a QT Application object

    dialog=QtGui.QDialog() #we make a dialog object

    dialog.resize(200, 150) #set size

    dialog.setMaximumSize(200, 150) #set maximum size

    dialog.setMinimumSize(200, 150) #set minimum size

    dialog.setWindowTitle("new dialog") #set title

    label=QtGui.QLabel(dialog) #make a label object child of dialog

    label.setText("am a text label") #set label text

    label.setGeometry(1, 20,200, 50)#set geometry x,y,width,high

    button=QtGui.QPushButton(dialog)#now we make a button object 

    button.setText("click me !")#set its text

    button.setGeometry(1, 60, 200, 50)#set geometry

    def changetext(self, value):#we make a function that change the label text

        if value==True:

            text=str(self.texttoset)#to make sure it will be a string

            self.label.setText(text)#set the text

ui=display()#we make  an object  from the display class

#now it is time to make a QThread class

class mythread(QtCore.QThread):#inherite from QtCore.QThread

    #this thread will change the text 10 times from "i have changed by a QThread" to "back all over again for the x time" then when finished changes text to "QThread has finished"

    def __init__(self):

        QtCore.QThread.__init__(self)#we construct the class

    def run(self):#built in function contain the code that the thread will excute

        x=0

        while x<=10:

            s=str(x)

            display.texttoset="i have changed by a QThread"#set the text wich the changetext function will display

            self.emit(QtCore.SIGNAL("anysignalname(bool)"), True) #we send the signal called "anysignalname" and send a bool argument

            time.sleep(1)#sleep for 1 sec

            gui()#refresh the gui        

            display.texttoset="back all over again for "+s+" time"#set the text wich the changetext function will display

            self.emit(QtCore.SIGNAL("anysignalname(bool)"), True) #we send the signal called "anysignalname" and send a bool argument

            time.sleep(1)#sleep for 1 sec

            gui()#refresh the gui

            x=x+1 #increase x value 

        display.texttoset="QThread has finished!!"#set the text wich the changetext function will display

        self.emit(QtCore.SIGNAL("anysignalname(bool)"), True) #we send the signal called "anysignalname" and send a bool argument

        time.sleep(1)#sleep for 1 sec

        gui()#refresh the gui        

        

thread1=mythread()#we make a thread object

def start():

    thread1.start()

def connecter():#a function that will connect signals

    QtCore.QObject.connect(ui.button, QtCore.SIGNAL("clicked()"), start)#connect the button when clicked with the start function

    QtCore.QObject.connect(thread1, QtCore.SIGNAL("anysignalname(bool)"), ui.changetext)#connect the thread1 object with the changetext function with the "anysignalname" signal that sends a bool value 

ui.dialog.show()#show the dialog

connecter()#connect signals

ui.app.exec_()#start the app main loop

to ok so to send signals we use emit function
u can pass argument like char,int,bool
i dont know how to pass strings so you can use my way :)
if you have any question am glad to answer :)