from PyQt4 import QtGui, QtCore
import sys

class MyBox(QtGui.QMainWindow):

    def __init__(self, parent=None):
        QtGui.QMainWindow.__init__(self, parent)
        
        main_widget = QtGui.QWidget()
        self.setCentralWidget(main_widget)
        self.setWindowTitle("C++ Welcome!")

        main_layout = QtGui.QHBoxLayout()
        main_widget.setLayout(main_layout)

        info_label = QtGui.QLabel("Hello Qt!")
        quit_btn = QtGui.QPushButton("Click Me!")
        cust_btn = QtGui.QPushButton("Custom Print!")
        main_layout.addWidget(info_label)
        main_layout.addWidget(quit_btn)
        main_layout.addWidget(cust_btn)

        # connection
        QtCore.QObject.connect( quit_btn, QtCore.SIGNAL("clicked()"), self.close )
        QtCore.QObject.connect( cust_btn, QtCore.SIGNAL("clicked()"), self.cust_action )

    def cust_action(self):
        print("Hello C++ from Python")

def main():
    app = QtGui.QApplication(sys.argv)
    mybox = MyBox()
    mybox.show()
    sys.exit(app.exec_())

if __name__ == "__main__":
    main()