How to use qthreads to run a function inside a qdialog?

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Python

threads

PyQt

I searched on similar cases but i didnt find one that corresponds to the way i set up my application. In the below code, i call a QtWidgets.QDialog class from my main window. And after a button is pressed a heavy operation is starting. My problem is: how can i implement QThreads in my example? Can you please show me what i need to change? Since the heavy operation is called from my dialog and not from the main window class, how exactly can i use threads in here?

class MainScreen(QtWidgets.QMainWindow): 
 
    # do stuff 
 
 
    def caller(self): 
        dialog2 = OpenDialog(self, self.parameter) 
        dialog2.exec() 
        # do more stuff     
 
 
 
 
 
 
class OpenDialog(QtWidgets.QDialog): 
 
    def __init__(self, parent, parameter): 
        super().__init__(parent) 
        self.parameter = parameter 
        uic.loadUi('interface/dialog.ui', self) 
 
        self.pushButton.clicked.connect(self.heavy_function) 
    
 
 
 
    def heavy_function(self): 
        # do alot of stuff that take time 

What I have tried:

i tried searching for similar issues but i couldnt much my case with them.