[issue17956] add ScheduledExecutor

[Antoine Pitrou]

Antoine Pitrou added the comment:

To be honest I can't find much to say about this proposal, but I think it would be good if the time function were configurable (both for test purposes, and to allow passing e.g. time.monotonic). I suppose this could be an executor option.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17956>
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