# NotImplementedError for flower is a known issue on Windows
# this file if using a venv
C:path oyourprojectvenvlibsite-packages ornadoplatformasyncio.py
# this file if not using venv
C:UsersusernameAppDataLocalProgramsPythonPython39Libsite-packages ornadoplatformasyncio.py
# this file if you have it set up in the root of our project
C:path oyourprojectflowerconfig.py
import asyncio
import sys
if sys.platform == 'win32':
asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())