What is the reason that this code throws

RuntimeError: Tasks cannot be run outside of a flow

? The

parse

function is a task.

with ThreadPoolExecutor() as executor
   res = [executor.submit(parse, root, n) for n in range(0, table_count, 5)]

data = [r.result() for r in as_completed(res)]

Not sure it is the cause of the error, but I think you’re missing a

:

after

with ThreadPoolExecutor() as executor