Maybe a proposal should be discussed as an addendum to PEP 484? Or would
Mark Shannon reject that?

On Sun, Jan 15, 2017 at 2:48 PM, Ivan Levkivskyi <report@bugs.python.org>
wrote:

>
> Ivan Levkivskyi added the comment:
>
> > Maybe we need to take a step back and look at the needs for code that
> wants to implement runtime type checking more in general?
>
> I would say that the most convenient way for me would be a set of
> "inspect-style" simple helpers like ``is_union``, ``is_generic``,
> ``get_parameters`` (similar to inspect.ismethod, inspect.getargspec etc).
>
> > ISTM we have ways to access the parameters of a parameterized type
> (typically t.__parameters__) but we don't have a reasonable way yet to
> determine what kind of thing t is.
>
> There is one way that I see right now: using _gorg. For example,
> ``_gorg(Tuple[int, str]) is Tuple``, ``_gorg(Callable[..., str]) is
> Callable``, etc. This will also work for ``Union`` if we relax the assert
> that requires type to be instance of GenericMeta (now there is a common
> internal API used by almost everything in typing).
>
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> <http://bugs.python.org/issue29262>
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