Run python async function in sync function

asynctest.py

import asyncio

from asgiref.sync import async_to_sync


async def async_func(value):
    asyncio.sleep(0.1)
    return value

def nested_sync_func():
    ret = async_to_sync(async_func)()
    return ret

async def main():
    """main is async and started as normal with asyncio.run"""
    print("BEGIN main")

    ret = nested_sync_func()
    print(ret)


if __name__ == "__main__":
    asyncio.run(main())