Paul Ganssle <p.gans...@gmail.com> added the comment:
I checked and it appears that `attrs` handles this by creating *all* dicts using the default dict_factory (similar to my original suggestion of just using `dict` instead of the specific type), if I'm reading this right: https://github.com/python-attrs/attrs/blob/master/src/attr/_funcs.py#L102 Using `attr.asdict` seems to bear this out, as `defaultdict` attributes are converted to `dict` when the dict factory is not specified. I think changing the default behavior like that would be a backwards-incompatible change at this point (and one that it's really hard to warn about, unfortunately), but we could still use the "fall back to dict_factory" behavior by trying to construct a `type(obj)(...)` and in the case of an exception return `dict_factory(...)`. ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue35540> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
