unittest tb_locals

When creating unittest modules, always supply the param tb_locals=True.

if __name__ == "__main__":  # pragma: no cover
    unittest.main(tb_locals=True)

Exactly like ^^

When running the unittest and an error occurs, the additional feedback from the list of local variables and current values’ can be indispensable.

Unfortunitely, the scope defaults to where the error was captured, not where would like to debug, normally that scope defaults to the unittest function. Which is not very useful and very frustrating to change.

The desperate way, to change the list of local variables scope, is to purposefully introduce a non-syntax error in the code block of interest.

like print("hi mom!", stream=sys.stderr)

^^ this is obviously wrong and that’s the entire point. It’s neither a compile error nor a syntax error, it’s just wrong usage which will be caught when running the code never reaching the unittest assert statement.