Signal the executor that it should free any resources that it is using when the currently pending futures are done executing. Calls to
Executor.map()made after shutdown will raise
If wait is
Truethen this method will not return until all the pending futures are done executing and the resources associated with the executor have been freed.
However if you keep track of your futures in a list then you can avoid shutting the executor down for future use using the
concurrent.futures.wait(fs, timeout=None, return_when=ALL_COMPLETED)
Wait for the
Futureinstances (possibly created by different
Executorinstances) given by
fsto complete. Returns a named 2-tuple of sets. The first set, named done, contains the futures that completed (finished or were cancelled) before the wait completed. The second set, named not_done, contains uncompleted futures.
note that if you don't provide a
timeout it waits until all futures have completed.
You can also use
futures.as_completed() instead, however you'd have to iterate over it.