Fetch track name and its artist from several track IDs using asyncio.

asynchronously.py

import time
import asyncio

import aiohttp

TOKEN = 'Your access token here'


async def fetch_track(track_id):
    """Async. fetch track data using a track ID."""
    async with aiohttp.request('GET',
            'https://api.kkbox.com/v1.1/tracks/'+track_id,
            params={'territory': 'TW'},
            headers={'Authorization': 'Bearer ' + TOKEN}) as resp:
        return await resp.json()


async def fetch_tracks_briefly(track_ids):
    """Async. fetch name of tracks and artists from a list of track IDs.""" 
    results = list()
    futures = asyncio.as_completed(
            [fetch_track(track_id) for track_id in track_ids])
    for future in futures:
        track_info = await future
        results.append((
            track_info['id'],
            track_info['name'],
            track_info['album']['artist']['name']))
    return results


def main():
    """Do the fetching and calculate the time."""
    with open('20_tracks.txt', 'r') as f:
        track_ids = [track_id.strip() for track_id in f]
    loop = asyncio.get_event_loop()
    start = time.time()
    results = loop.run_until_complete(fetch_tracks_briefly(track_ids))
    end = time.time()

    print('Fetched {} tracks in {:.3f} seconds.'.format(
        len(results), end-start))


if __name__ == '__main__':
    main()