[issue21178] doctest cause warnings in tests using generators

[Terry J. Reedy]

Terry J. Reedy added the comment:

I not am not sure I see a bug here, a discrepancy between doc and behavior. Even if not, you may have a legitimate enhancement request.

3.4 now warns about ignored exceptions during shutdown in case there is a fixable bug in the code being shut down. This is intended to be a feature, not a problem. I don't know if the warnings can be suppressed.

3.4 also implemented PEP 442 so "objects with __del__() methods, as well as generators with finally clauses, can be finalized when they are part of a reference cycle." Your second patch puts a generator in a reference cycle. Generators have a .__del__ method. Perhaps its body is the equivalent of "self.throw(GeneratorExit)". If so, that could be wrapped with the equivalent of "try:...except BaseException: pass" to avoid leaking exceptions.

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nosy: +ncoghlan, terry.reedy
stage:  -> needs patch
versions: +Python 3.5

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