I would really like to be able to trigger all warnings consistently and statically without executing the code.

This is useful (for instance) for this simple script which validates the ast: https://github.com/pre-commit/pre-commit-hooks/blob/master/pre_commit_hooks/check_ast.py

when run with PYTHONWARNINGS=error I get nice error reports for things such as invalid escape sequence, but I do not get them for string-call which I would like to

This does seem like a bug and prematurely closed, I'm a bit disappointed in the current resolution