py: refactoring: remove helper, use TypeSchemaIndex instead. #162

Job	Run time
test-csharp-sdk (latest, 8.0.x)	1m 19s
test-typescript-sdk-r4 (latest)	14s
test-typescript-ccda-example (latest)	28s
test-python-sdk-test (latest)	1m 6s
	3m 7s

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