在这段代码中，如何使用按钮触发PyQt中的操作？

Question

我想使用push butthon（'series\u search\u button'）触发类Ui\u series\u search（）中的另一个窗口。我一直在努力。你知道吗

class Ui_series_search(object):
    def setupUi(self, series_search):
        #codes

    def retranslateUi(self, series_search):
        #codes


class HomePage(object):
    def setupUi(self, MainWindow):
        self.series_search_pushButton = QtGui.QPushButton(self.tab_series)

        self.series_search_pushButton.setObjectName(_fromUtf8("
                               series_search_pushButton"))

    def retranslateUi(self, MainWindow):
        codes


if __name__ == "__main__":
    import sys
    app = QtGui.QApplication(sys.argv)
    MainWindow = QtGui.QMainWindow()
    ui = Homepage()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())