Python tests

Add `PFCOUNT` command. #150

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Run time

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Job	Run time
build-amazonlinux-latest	2m 4s
build-macos-latest	11m 15s
test-ubuntu-latest (6.2.14)	2m 25s
lint-rust	1m 0s
test-ubuntu-latest (7.2.3)	5m 40s
	22m 24s