Two kind of mistakes:
1. Missed space. After concatenating there is no space between words.
2. Missed comma. Causes unintentional concatenating in a list of strings.
Executors in concurrent.futures accepted tasks after executor was shutdown by interpreter exit. Tasks were left in PENDING state forever. This fix changes submit to instead raise a RuntimeError.
* bpo-31249: Fix ref cycle in ThreadPoolExecutor
concurrent.futures: WorkItem.run() used by ThreadPoolExecutor now
breaks a reference cycle between an exception object and the WorkItem
object. ThreadPoolExecutor.shutdown() now also clears its threads
set.
* shutdown() now only clears threads if wait is true.
* Revert changes on shutdown()
bpo-29212: Fix the ugly ThreadPoolExecutor thread name.
Fixes the newly introduced ugly default thread name for concurrent.futures
thread.ThreadPoolExecutor threads. They'll now resemble the old <=3.5
threading default Thread-x names by being named ThreadPoolExecutor-y_n.
Serhiy Storchaka
Mark Nemec
Antoine Pitrou
Victor Stinner
Gregory P. Smith
Raymond Hettinger
Guido van Rossum
Brian Quinlan
Andrew Svetlov
Florent Xicluna
Antoine Pitrou