pyside Signals 和 Slots

#python 3.4.3
#PySide 1.2.2

#!/usr/bin/env python

    import sys
    from PySide import QtCore, QtGui

    # define a function that will be used as a slot
    def sayHello():
        print 'Hello world!'

    app = QtGui.QApplication(sys.argv)

    button = QtGui.QPushButton('Say hello!')

    # connect the clicked signal to the sayHello slot
    button.clicked.connect(sayHello)
    button.show()

    sys.exit(app.exec_())

#!/usr/bin/env python

    import sys
    from PySide import QtCore

    # define a new slot that receives a C 'int' or a 'str'
    # and has 'saySomething' as its name
    @QtCore.Slot(int)
    @QtCore.Slot(str)
    def saySomething(stuff):
        print stuff

    class Communicate(QtCore.QObject):
        # create two new signals on the fly: one will handle
        # int type, the other will handle strings
        speakNumber = QtCore.Signal(int)
        speakWord = QtCore.Signal(str)

    someone = Communicate()
    # connect signal and slot properly
    someone.speakNumber.connect(saySomething)
    someone.speakWord.connect(saySomething)
    # emit each 'speak' signal
    someone.speakNumber.emit(10)
    someone.speakWord.emit("Hello everybody!")