inspect.isfunction equivalent behind abi3-py38 feature

[gertjanvanzwieten]

The "abi3-py38" feature gates out PyFunction, which I used to rely on to detect function objects via obj.downcast_exact::<PyFunction>().is_ok(). Is there another way that does not involve a downcast to see if something is a function, and that is available behind the "abi3-py38" feature gate?

[gertjanvanzwieten]

I solved it now using obj.is_instance(PyModule::import(py, "types")?.getattr("FunctionType")?), which works well enough. Curious to learn of better solutions though.