python-Pympler fails to build with Python 3.9.0a2.

======================================================================
ERROR: test_background_monitoring (tracker.test_classtracker.SnapshotTestCase)
Test background monitoring.
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Traceback (most recent call last):
  File "/builddir/build/BUILD/Pympler-0.8/test/tracker/test_classtracker.py", line 237, in test_background_monitoring
    self.tracker.stop_periodic_snapshots()
  File "/builddir/build/BUILDROOT/python-Pympler-0.8-1.fc32.x86_64/usr/lib/python3.9/site-packages/pympler/classtracker.py", line 514, in stop_periodic_snapshots
    if self._periodic_thread and self._periodic_thread.isAlive():
AttributeError: 'PeriodicThread' object has no attribute 'isAlive'

======================================================================
ERROR: test_background_monitoring (tracker.test_classtracker.SnapshotTestCase)
Test background monitoring.
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/builddir/build/BUILD/Pympler-0.8/test/tracker/test_classtracker.py", line 151, in tearDown
    self.tracker.stop_periodic_snapshots()
  File "/builddir/build/BUILDROOT/python-Pympler-0.8-1.fc32.x86_64/usr/lib/python3.9/site-packages/pympler/classtracker.py", line 514, in stop_periodic_snapshots
    if self._periodic_thread and self._periodic_thread.isAlive():
AttributeError: 'PeriodicThread' object has no attribute 'isAlive'

See https://docs.python.org/3.9/whatsnew/3.9.html#removed

"The isAlive() method of threading.Thread has been removed. It was deprecated since Python 3.8. Use is_alive() instead."


For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.9/fedora-rawhide-x86_64/01148694-python-Pympler/

For all our attempts to build python-Pympler with Python 3.9, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.9/package/python-Pympler/

Testing and mass rebuild of packages is happening in copr. You can follow these instructions to test locally in mock if your package builds with Python 3.9:
https://copr.fedorainfracloud.org/coprs/g/python/python3.9/

Let us know here if you have any questions.

Python 3.9 will be included in Fedora 33. To make that update smoother, we're building Fedora packages with early pre-releases of Python 3.9.
A build failure prevents us from testing all dependent packages (transitive [Build]Requires), so if this package is required a lot, it's important for us to get it fixed soon.
We'd appreciate help from the people who know this package best, but if you don't want to work on this now, let us know so we can try to work around it on our side.