def METHOD_NAME(self, obj, data=None):
    data = self.entry.get_text()
    data = data + obj.get_label()
    if any( x in data for x in [ '/2', '/4', '/8', '/16', '/32', '/64', '/128']):
        v = [0] + [float(x) for x in data.replace('/','.').split('.')]
        data = f'{v[-3] + v[-2]/v[-1]:6.7}'
    self.entry.set_text(data)