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Coverage.py Regex Pragmas
Coverage.py uses regexes to define pragma syntax. This is surprisingly powerful.
By adding def __repr__ as an exclusion regex, all of those methods were automatically excluded from coverage measurement without having to add a comment to each one. Not only did this let people add custom exclusions in their projects, but it enabled third-party plugins that could configure regexes in other interesting ways: So regexes aren’t perfect, but they’re a pretty good balance: flexible and powerful, and will work great on real code even if we can invent weird edge cases where they fail.
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