Support flask 2
Flask 2 works *almost* out of the box, however it breaks `example_data.py`, see below: --- When running example_data.py, the following error appears: [error-example-data.txt](/uploads/04e1c218f4eb96b25e461fadae5f3e3e/error-example-data.txt) The print message: ``` <WrapperTestResponse streamed [400 BAD REQUEST]> ``` is from adding print(generated) in line 381 of example_data.py It seems like the error takes place when parsing the arguments in line 406 of exams.py (removing the 'add arguments' and assigning values manually in exams.py gives no errors.)
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