Providing a list to a function

I've never come across this problem until now and can't think how to proceed.I would like to know how to provide each element of a tuple to a function that wants individual parameters:

myTuple = (1,2,3,4)def myFunction(w, x, y, z):

but calling it with:

u = myFunction(myTuple)

This is probably beside the point, but the application has to do with drawing with PyQt's QPainter and providing the coordinates in a list (mylist, in the code below):

#!/usr/bin/python3import sysfrom PyQt5.QtWidgets import QLabel, QMainWindow, QApplicationfrom PyQt5.QtCore import Qtfrom PyQt5.QtGui import QPainter, QPixmapclass MyWindow(QMainWindow):    def __init__(self):        super().__init__()        lbl = QLabel()        pm = QPixmap(70, 70)        pm.fill(Qt.white)        lbl.setPixmap(pm)        self.setCentralWidget(lbl)        p = QPainter(lbl.pixmap())        p.drawLine(10,20,10,40)        line = (10,40, 40, 50)        p.drawLine(line)        p.end()        self.show()app = QApplication(sys.argv)win = MyWindow()app.exec_()

Thank you for any help.