Как решить проблему с кодировкой json?

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import requests
import json
import vk_api
from vk_api import VkUpload

# additional import
import urllib.parse

token = "токен"
application_id = 5182111
group_id = 172392444
owner_id_group = -172392444
foo = 'Тут 2000 символов'

data = {
    'access_token': token,
    'owner_id': owner_id_group,
    'from_group': 1,
    'message': foo,
    'signed': 0,
    'v':"5.52"
    }
    
url_data = urllib.parse.urlencode(data)

n = requests.post('https://api.vk.com/method/wall.post', params=url_data)