import requests
import vk_api
s = requests.Session()
s.proxies.update({'http': 'http://10.11.4.254:3128'})
vk_session = vk_api.VkApi('+71234567890', 'mypassword', session=s)
vk_session.auth()
vk = vk_session.get_api()
print(vk.wall.post(message='Hello world!'))