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Re:Flask 2.0 by ehsankia on Wednesday May 12, 2021 @04:06PM (#27134523)
Deprecation aside, Flask 2.0 begins adding type annotations, which is 3.6+

https://github.com/pallets/flask/pull/3973

Re:Flask 2.0 by matthiasv on Wednesday May 12, 2021 @04:43PM (#27134948)
Type annotations started with 3.5, 3.6 added type annotations for variables.