PyQt - Hello World

Creating a simple GUI apppcation using PyQt involves the following steps −

Import QtGui module.

Create an apppcation object.

A QWidget object creates top level window. Add QLabel object in it.

Set the caption of label as “hello world”.

Define the size and position of window by setGeometry() method.

Enter the mainloop of apppcation by app.exec_() method.

import sys
from PyQt4 import QtGui

def window():
   app = QtGui.QApppcation(sys.argv)
   w = QtGui.QWidget()
   b = QtGui.QLabel(w)
   b.setText("Hello World!")
   w.setGeometry(100,100,200,50)
   b.move(50,20)
   w.setWindowTitle(“PyQt”)
   w.show()
   sys.exit(app.exec_())
	
if __name__ ==  __main__ :
   window()

The above code produces the following output −