It's a shame there aren't any mature tools for mutation testing in Python. It provides really valuable data.
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Optimise time to first feature. Allow mutation of the running system to experiment. Interactive inspection of data.
I love the idea of mutation testing, but changing my code in arbitrary ways, then running it, is scary. Many PLs don't have a good sandbox available.
Pitest is a nifty mutation testing tool. It focuses on mutating expressions covered by unit tests, maximising speed!