def create(self):
    if (self.type == 'gb'):
        return GB()
    elif (self.type == 'hb'):
        return HDB('hbba')
    elif (self.type == 'db'):
        return HDB('dbba')
def create(self):
    if (self.type == 'gb'):
        return GB()
    elif (self.type == 'hb'):
        return HDB('hbba')
    elif (self.type == 'db'):
        return HDB('dbba')