Thanks, will bring it to the dev list. On Fri, 2020-12-04 at 07:07 -0800, Julio Di Egidio wrote: > On Thursday, 3 December 2020 at 19:28:19 UTC+1, Paul Bryan wrote: > > Is this the correct behavior? > > > > Python 3.9.0 (default, Oct 7 2020, 23:09:01) > > [GCC 10.2.0] on linux > > Type "help", "copyright", "credits" or "license" for more > > information. > > > > > help(list[int]) > > Traceback (most recent call last): > > File "<stdin>", line 1, in <module> > > File "/usr/lib/python3.9/_sitebuiltins.py", line 103, in __call__ > > return pydoc.help(*args, **kwds) > > File "/usr/lib/python3.9/pydoc.py", line 2001, in __call__ > > self.help(request) > > File "/usr/lib/python3.9/pydoc.py", line 2060, in help > > else: doc(request, 'Help on %s:', output=self._output) > > File "/usr/lib/python3.9/pydoc.py", line 1779, in doc > > pager(render_doc(thing, title, forceload)) > > File "/usr/lib/python3.9/pydoc.py", line 1772, in render_doc > > return title % desc + '\n\n' + renderer.document(object, name) > > File "/usr/lib/python3.9/pydoc.py", line 473, in document > > if inspect.isclass(object): return self.docclass(*args) > > File "/usr/lib/python3.9/pydoc.py", line 1343, in docclass > > (str(cls.__name__) for cls in type.__subclasses__(object) > > TypeError: descriptor '__subclasses__' for 'type' objects doesn't > > apply to a 'types.GenericAlias' object > > > > > > > > > I would have expected the output to the identical to help(list). > > As I get it from the docs (*), these new generics still only work in > type hinting contexts, > and I'd rather have expected a more useful error message: but, > whether that is temporary > (possibly a plain bug, as in a forgotten case) or, instead, just "how > things are", I wouldn't > know... might be a good question for Python developers. > > (*) As in this one for a starter, but see also PEP 585: > "*In type annotations* you can now use ...", my emphasis. > <https://docs.python.org/3.9/whatsnew/3.9.html#type-hinting-generics-in-standard-collections > > > > Julio
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