Многопоточность в python

import requests
import csv
# Многопоточность
from multiprocessing import Pool
from time import sleep
 
def get_html(url):
    # sleep(1)
    r = requests.get(url)
    return r.text
 
 
def write_csv(data):
    with open('websites.csv', 'a',  encoding='utf-8') as file:
        order = ['name', 'url', 'description', 'traffic', 'percent']
        writer = csv.DictWriter(file, fieldnames=order)
        writer.writerow(data)
 
 
def get_page_data(text):
        data = text.strip().split('\n')[1:]
 
        for row in data:
            columns = row.strip().split('\t')
            name = columns[0]
            url = columns[1]
            description = columns[2]
            traffic = columns[3]
            percent = columns[4]
 
            data = {'name': name,
                    'url': url,
                    'description': description,
                    'traffic': traffic,
                    'percent': percent}
            write_csv(data)
 
 
def make_all(url):
    text = get_html(url)
    get_page_data(text)
 
 
def main():
    #6320
    url = 'https://www.liveinternet.ru/rating/ru//today.tsv?page={}'
    urls = [url.format(str(i)) for i in range(1, 6321)]
 
    # Создаем потоки , 20 процессов
    with Pool(20) as p:
        # встроенный метод в класс
        p.map(make_all, urls)
 
if __name__ == '__main__':
    main()