from tools import handlers

def save(self, *args, **kwargs):
    if self.url == 'govno' and self.description == 'mocha':
        self.handler = handlers.yoba_handler
    else:
        self.handler = handlers.another_handler
    return super().save(*args, **kwargs)

def handler(self):
    raise Exception('I need a handler from tools.handlers blyad')