AsyncIO only prints the single url

The https://www.jython.org url is never downloaded based on what is printed out

Steps to recreate:

git clone git@github.com:realpython/materials.git real_python_materials
cd real_python_materials/
python3.6 -m venv 36env
source 36env/bin/activate
pip install aiohttp

Running the script:

python io_asyncio.py 
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Read 273 from http://olympus.realpython.org/dice
Downloaded 160 sites in 3.151465892791748 seconds

再現手順に従って python io_asyncio.py を実行し、io_asyncio.py を調査します。URL がどのようにスケジュールされ、報告されるかに重点を置いてください。繰り返される http://olympus.realpython.org/dice URL だけでなく、https://www.jython.org が実際にダウンロードされていることを確認してください。出力に意図したサイト群からのダウンロードが反映されていれば完了です。