code: def test_screenInformation():
      # a qApp is still needed, otherwise screen is None
      qApp = mkQApp()  # noqa
      screen = QtGui.QGuiApplication.primaryScreen()
      screens = QtGui.QGuiApplication.screens()
      resolution = screen.size()
      availableResolution = screen.availableSize()
      print(
          "Screen resolution: {}x{}".format(
              resolution.width(), resolution.height()
          )
      )
      print(
          "Available geometry: {}x{}".format(
              availableResolution.width(), availableResolution.height()
          )
      )
      print("Number of Screens: {}".format(len(screens)))
      return None
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_screenInformation() and returns: None