PyQt_test.py

#Code copied from: http://bit.ly/13yRYU4
#And later modified a bit.

from PyQt4 import QtGui
from PyQt4 import QtCore
from PyQt4.QtCore import pyqtSlot,SIGNAL,SLOT
import sys

class MyMainWindow(QtGui.QMainWindow):
    
   def resizeEvent(self,resizeEvent):
    print self.width()
   
    
    
def main():    

    app = QtGui.QApplication(sys.argv)
    mainWindow = MyMainWindow()
    
    #Resize width and height
    mainWindow.resize(300,120)    
    mainWindow.setWindowTitle('PyQT Detect QMainWindow Resize Event')  
    
    mainWindow.show() 
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()