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To aid in maintainability, it should be easy to leave debug printing code in extractors and have it only print when run with some debugging flag, or ideally with multiple debugging levels, ala classic dprintf(level, fmt, ...).
Some discussion of this in here, and @yan12125 suggests a pull request.
I'm pretty sure if I implemented it it wouldn't be very Pythonic, so perhaps it's best to just mention the idea as an issue and leave it for someone else to implement.