On Sun, 25 Jul 2021, 9:26 pm Serhiy Storchaka, <storch...@gmail.com> wrote:
> In 3.10 the union type (the type of the result of the | operator for > types) was added (https://www.python.org/dev/peps/pep-0604/). It is > exposed as types.Union. There are differences between typing.Union and > types.Union: > > * typing.Union is indexable, types.Union is not. > * types.Union is a class, typing.Union is not. > > types.Union corresponds to private class typing._UnionGenericAlias, not > typing.Union. It is confusing that typing.Union and types.Union have the > same name but are so different. Note also that most classes in the types > module have the "Type" suffix: FunctionType, MethodType, ModuleType, > etc. I think that it would be better to rename types.Union to > types.UnionType. > If we wanted to be completely explicit, the most exact name would be "TypeUnionType": it is the type of object you get specifically when unioning types, not when unioning arbitrary objects. Cheers, Nick. >
_______________________________________________ Python-Dev mailing list -- python-dev@python.org To unsubscribe send an email to python-dev-le...@python.org https://mail.python.org/mailman3/lists/python-dev.python.org/ Message archived at https://mail.python.org/archives/list/python-dev@python.org/message/3O6STJNH6NCNWEBOGV3OB3DC6M2K47RN/ Code of Conduct: http://python.org/psf/codeofconduct/
