Call asyncio Future in scope

Asyncio futures returned by run_in_executor are designed to run in the asyncio event loop and are distinct from concurrent ones. The correct asyncio code would look like this:

async def track_progress():
    for i in range(5):
        await asyncio.sleep(1)
        print(get_progress(futures_))

loop.run_until_complete(track_progress())

It prints 0 4 4 7 7.

Note that you don't need asyncio and run_in_executor if you just want to run stuff in threads - concurrent.futures is perfectly capable of handling that on its own. For example:

executor = concurrent.futures.ProcessPoolExecutor(max_workers=4)
inputs = ['a', 'b', 'c', 'd', 'e', 'f', 'g']
futures_ = [executor.submit(long_task, i) for i in inputs]

Since executor.submit real concurrent futures, futures_ contains them as well. With this modification your original for loop that tracks their progress will work just fine and also print 0 4 4 7 7.