The QtGui.QComboBox is a widget that allows a user to choose from a list of options.

#!/usr/bin/python

# -*- coding: utf-8 -*-

"""

ZetCode PyQt4 tutorial 

This example shows

how to use QtGui.QComboBox widget.

author: Jan Bodnar

website: zetcode.com

last edited: September 2011

"""

import sys

from PyQt4 import QtGui, QtCore

class Example(QtGui.QWidget):

    def __init__(self):

        super(Example, self).__init__()

        self.initUI()

    def initUI(self):      

        self.lbl = QtGui.QLabel("Ubuntu", self)

        combo = QtGui.QComboBox(self)

        combo.addItem("Ubuntu")

        combo.addItem("Mandriva")

        combo.addItem("Fedora")

        combo.addItem("Red Hat")

        combo.addItem("Gentoo")

        combo.move(50, 50)

        self.lbl.move(50, 150)

        combo.activated[str].connect(self.onActivated)        

        self.setGeometry(300, 300, 300, 200)

        self.setWindowTitle('QtGui.QComboBox')

        self.show()

    def onActivated(self, text):

        self.lbl.setText(text)

        self.lbl.adjustSize()  

def main():

    app = QtGui.QApplication(sys.argv)

    ex = Example()

    sys.exit(app.exec_())

if __name__ == '__main__':

    main()

The example shows a QtGui.QComboBox and a QtGui.QLabel. The combo box has a list of five options. These are the names of Linux distros. The label widget displays the selected option from the combo box.

combo = QtGui.QComboBox(self)

combo.addItem("Ubuntu")

combo.addItem("Mandriva")

combo.addItem("Fedora")

combo.addItem("Red Hat")

combo.addItem("Gentoo")

We create a QtGui.QComboBox widget with five options.

combo.activated[str].connect(self.onActivated)

Upon an item selection, we call the onActivated() method.

def onActivated(self, text):

    self.lbl.setText(text)

    self.lbl.adjustSize()

Inside the method, we set the text of the chosen item to the label widget. We adjust the size of the label.

Figure: QtGui.QComboBox