4-Signals2.py

#! /usr/bin/env python3
#-*-coding:utf-8-*-

import sys
from PyQt4 import QtGui, QtCore


class Example(QtGui.QWidget):
    
    def __init__(self):
        super(Example, self).__init__()
        self.initUI()

    def initUI(self):
        self.setGeometry(300, 300, 250, 150)
        self.setWindowTitle('Event Handler')
        self.show()

    def keyPressEvent(self, e):
        if e.key() == QtCore.Qt.Key_Escape:
            self.close()


def main():
    app = QtGui.QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()