How to give an interval between requests on aiohttp

asyncio_lock.py

import time
from typing import List

import aiohttp
import asyncio
from asyncio.futures import Future


URL = 'https://www.mocky.io/v2/5185415ba171ea3a00704eed'  # Mock API
TIME_INTERVAL = 1  # 1 second
LOCK = asyncio.Lock()


async def _request(session: aiohttp.ClientSession) -> None:
    await LOCK.acquire()

    start_time = time.time()
    await session.get(URL, ssl=False)
    end_time = time.time()

    elapsed_time = end_time - start_time
    if elapsed_time < TIME_INTERVAL:
        print('WAITING ..')
        await asyncio.sleep(TIME_INTERVAL - elapsed_time)
    LOCK.release()


async def request(cnt) -> List[Future]:
    tasks: List[Future] = []
    async with aiohttp.ClientSession() as session:
        for i in range(cnt):
            task: Future = asyncio.ensure_future(_request(session=session))
            tasks.append(task)
        await asyncio.gather(*tasks)
    return tasks


if __name__ == '__main__':
    loop = asyncio.get_event_loop()
    futures = asyncio.ensure_future(request(cnt=10))
    loop.run_until_complete(futures)