New submission from Zac Hatfield-Dodds <zac.hatfield.do...@gmail.com>:
Many pytest users would like a concise way to either suppress warnings, or convert them to errors [1]. The current best approach is: with warnings.catch_warnings(): warnings.simplefilter("ignore") # or "error" but even this becomes tediously verbose when repeated in hundreds of tests (which I suspect is responsible for many misuses of `pytest.raises()`). Since these two functions take disjoint arguments [2], I propose allowing catch_warnings() to accept arguments for simplefilter() and forward them on: with warnings.catch_warnings("ignore"): # or "error" I have a quick implementation at [3] which I can finish if the idea is acceptable. Although I don't have a concrete use-case for more than the 'action' and 'category' arguments, forwarding all rather than some makes the semantics very simple. I'd emphasize again that this is very much a convenience-focussed change: I estimate that 95% of all uses will pass only `action="error"` or `action="ignore"`. Supporting a concise and simple interface for this seems worth the small complication to the design of the warnings module. [1] see e.g. https://github.com/pytest-dev/pytest/issues/9404 for a long thread [2] unlike `filterwarnings()`, which has a `module=` argument which would collide with `catch_warnings()` [3] https://github.com/python/cpython/compare/main...Zac-HD:zac-hd/one-line-catch-warnings ---------- components: Library (Lib) messages: 415647 nosy: Zac Hatfield-Dodds priority: normal severity: normal status: open title: Convenient `simplefilter()` in `warnings.catch_warnings()` type: enhancement versions: Python 3.11 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue47074> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com