Message dialogs pop up to grab the user's attention and to display important information. In this recipe, we'll create a simple information dialog.
Open the QGIS Python Console by going to the Plugins menu and selecting Python Console.
We will create a message dialog and display some text in it, as follows:
First, we need to import the GUI library:
from PyQt4.QtGui import *
Then, we'll create the message dialog:
msg = QMessageBox()
Next, we'll set the message we want to display:
msg.setText("This is a simple information message.")
Finally, we call the execution method to display the message dialog:
msg.show()