Threading vs Asyncio, edited version of this artical: https://hackernoon.com/asyncio-for-the-working-python-developer-5c468e6e2e8e

example.py

import time
import threading
import requests
import asyncio
import aiohttp

URL = 'https://google.com'
MAX_CLIENTS = 500


def fetch_sync(pid):
    print('Fetch thread process {} started'.format(pid))
    start = time.time()
    t = threading.Thread(target=requests.get, args=[URL])
    t.start()

    print('Process {}: took: {:.2f} seconds'.format(
        pid, time.time() - start))


async def fetch_async(pid):
    print('Fetch async process {} started'.format(pid))
    start = time.time()
    async with aiohttp.ClientSession() as sess:
        response = await sess.get(URL)

    print('Process {}: took: {:.2f} seconds'.format(
        pid, time.time() - start))

    response.close()


def synchronous():
    start = time.time()
    for i in range(1, MAX_CLIENTS + 1):
        fetch_sync(i)
    print("Process took: {:.2f} seconds".format(time.time() - start))


async def asynchronous():
    start = time.time()
    tasks = [asyncio.ensure_future(
        fetch_async(i)) for i in range(1, MAX_CLIENTS + 1)]
    await asyncio.wait(tasks)
    print("Process took: {:.2f} seconds".format(time.time() - start))


print('Synchronous:')
synchronous()

print('Asynchronous:')
ioloop = asyncio.ProactorEventLoop()
ioloop.run_until_complete(asynchronous())