How to return mouse coordinates in realtime?

The QMouseEvent function must be implemented since it is executed when the mouse is moved.

import sys
from PyQt5.QtWidgets import (QApplication, QLabel, QWidget)


class MouseTracker(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()
        self.setMouseTracking(True)

    def initUI(self):
        self.setGeometry(300, 300, 300, 200)
        self.setWindowTitle('Mouse Tracker')
        self.label = QLabel(self)
        self.label.resize(200, 40)
        self.show()

    def mouseMoveEvent(self, event):
        self.label.setText('Mouse coords: ( %d : %d )' % (event.x(), event.y()))


if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = MouseTracker()
    sys.exit(app.exec_())