Python tests

Fix some mypy issues in test code #605

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Run time

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Job	Run time
Python 3.9 on ubuntu-latest	25s
Python 3.10 on ubuntu-latest	28s
Python 3.11 on ubuntu-latest	23s
Python 3.12 on ubuntu-latest	30s
Python 3.13 on ubuntu-latest	1m 17s
Python 3.9 on macos-latest	47s
Python 3.10 on macos-latest	44s
Python 3.11 on macos-latest	18s
Python 3.12 on macos-latest	23s
Python 3.13 on macos-latest	1m 2s
Python 3.9 on windows-latest	1m 50s
Python 3.10 on windows-latest	2m 8s
Python 3.11 on windows-latest	2m 3s
Python 3.12 on windows-latest	2m 6s
Python 3.13 on windows-latest	3m 20s
	17m 44s