Run async-coroutine synchronously

# following <https://stackoverflow.com/a/49333864>

import asyncio

def render(loop):

    async def test():
        await asyncio.sleep(2)
        print("hi")
        return 200

    future = asyncio.run_coroutine_threadsafe(test(), loop)
    result = future.result()
    return result

loop = asyncio.get_event_loop()
result = render(loop)
print("result of async coroutine is:", result)
loop.close()