Пример

# -*- coding: utf-8 -*-
from vkontacher.vktestbot import VkTestBot
import time

bot = VkTestBot()
bot.auth('tel_or_email', 'mypassword')
i = 0
limit = 20
while True:
    i += 1
    bot.api('wall.post', {'message': u'Сообщение #%s' % i})
    if i == limit:
        break
    time.sleep(1)