Dutcho <dut...@ziggo.nl> added the comment:
I'm afraid my "even return" was interpreted in https://github.com/python/cpython/pull/19871 as "only return", while as stated "any annotation" suffices. To rephrase: If the *first* parameter of the registered function isn't annotated, any non-first annotation suffices for registering, but will not dispatch correctly. Example: ``` >>> @functools.singledispatch ... def func(arg, x):... >>> @func.register ... def _int(arg, x:int):... >>> @func.register ... def _str(arg, x:str):... ``` No errors happen, although parameter `x` is annotated, not the first parameter `arg`. So `func()` will dispatch on the type of `arg` according to the annotation of `x`. So I'm afraid the PR solves the specific "return" example case, but not the flagged general issue. ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue40464> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
