How to use the messagebird.conversation.Conversation function in messagebird

def conversation_update(self, id, update_request):
        uri = CONVERSATION_PATH + '/' + str(id)
        return Conversation().load(self.request(uri, 'PATCH', update_request, CONVERSATION_TYPE))

def start(self, start_request):
        uri = CONVERSATION_PATH + '/start'
        return Conversation().load(self.client.request(uri, 'POST', start_request))

def conversation_start(self, start_request):
        uri = CONVERSATION_PATH + '/start'
        return Conversation().load(self.request(uri, 'POST', start_request, CONVERSATION_TYPE))

def conversation_read(self, id):
        uri = CONVERSATION_PATH + '/' + str(id)
        return Conversation().load(self.request(uri, 'GET', None, CONVERSATION_TYPE))

def items(self, value):
        if isinstance(value, list):
            self._items = []
            for item in value:
                self._items.append(Conversation().load(item))