Broken UI (radio button doesn't work.)

p_estimator.py

class WindowClass(QtGui.QMainWindow, form_class):

    def __init__(self, parent=None):
        QtGui.QMainWindow.__init__(self, parent)
        self.setupUi(self)
        self.run_button.clicked.connect(self.run_button_clicked)  # Bind the event handlers

    def run_button_clicked(self):
        global dms

        """
        Set up the event handlers for clicking 'run'.
        TODO: Verify that this functions
        """
        sw_lat = (self.sw_lat_edit.text())
        sw_lon = (self.sw_lon_edit.text())
        ne_lat = (self.ne_lat_edit.text())
        ne_lon = (self.ne_lon_edit.text())

        if dms_radio.isChecked():
            dms = True
        elif dd_radio.isChecked():
            dms = False

        print(dms)

        corners = dict(sw_lat=sw_lat, sw_lon=sw_lon, ne_lat=ne_lat, ne_lon=ne_lon)
        ext_to_square(corners)

# This is probably wrong. Taken verbatim from website.
app = QtGui.QApplication(sys.argv)
Window = WindowClass(None)
Window.show()
app.exec()