[Python-Dev] Re: What to do about invalid escape sequences

Eric V. Smith wrote:

Hopefully the warnings in 3.9 would be more visible that what we saw in 3.7, so that library authors can take notice and do something about it before 3.10 rolls around. Eric

Apologies for the ~double-post on the thread, but: the SymPy team has figured out the right pytest incantation to expose these warnings. Given the extensive adoption of pytest, perhaps it would be good to combine (1) a FR on pytest to add a convenience flag enabling this mix of options with (2) an aggressive "marketing push", encouraging library maintainers to add it to their testing/CI.