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This PR makes two small changes to the
req_py3
branch:Implement nested using contextmanager
A reimplementation of nested for Python 3 from 43cdd22, using the already imported contextmanager from contextlib.
This should silence linter warnings about the implementation method, but also be Python 3.4+ compatible and more future proof for changes in later Python versions.
Fix test_tasks for Python 3
This is a rework of cadc78f that doesn't use six for Python 3.5+ support.