def classFactory(iface):
    from Plugin import TestPlugin
    return TestPlugin(iface)

from PyQt4.QtCore import *
from PyQt4.QtGui import *

class TestPlugin:
    def __init__(self, iface):
        self.iface = iface

    def initGui(self):
        self.action = QAction("Run", self.iface.mainWindow())
        QObject.connect(self.action, SIGNAL("triggered()"), self.onRun)
        self.iface.addPluginToMenu("Test Plugin:", self.action)

    def unload (self):
        self.iface.removePluginMenu("Test Plugin:", self.action)

    def onRun(self):
        QMessageBox.information(self.iface.mainWindow(), "debug", "Hello World")