Run Python tests

Add gdtf writer #250

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Run time

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Job	Run time
Run tests (3.9)	34s
Run tests (3.12)	37s
Run tests (3.14)	31s
Run tests (3.11)	37s
Run tests (3.13)	39s
Run tests (3.10)	35s
Run tests (3.8)	38s
	4m 11s