title: How to return mouse coordinates in realtime?
body: <p>I'm new to PyQt and I'm trying to use it to create a widget that returns the position of the mouse in real time.</p>
  
  <p>Here's what I have:</p>
  
  <pre><code>import sys
  from PyQt5.QtWidgets import (QWidget, QToolTip, 
      QPushButton, QApplication)
  from PyQt5.QtGui import QFont    
  
  class MouseTracker(QWidget):
      def __init__(self):
          super().__init__()
          self.initUI()
          self.setMouseTracking(True)
          self.installEventFilter(self)
  
      def initUI(self):        
          self.setGeometry(300, 300, 300, 200)
          self.setWindowTitle('Mouse Tracker')    
          self.show()
  
      def eventFilter(self, source, event):
          if (event.type() == QtCore.QEvent.MouseMove and
              event.buttons() == QtCore.Qt.NoButton):
                  pos = event.pos()
                  print('Mouse coords: ( %d : %d )' % (pos.x(), pos.y()))
          return QtGui.QWidget.eventFilter(self, source, event)
  
  
  if __name__ == '__main__':
  
      app = QApplication(sys.argv)
      ex = MouseTracker()
      sys.exit(app.exec_())
  </code></pre>
  
  <p>I'm confused on how to make this work. I set mouse tracking to True but I'm not sure how to apply the event filter. Any help?</p>