Generic NamedTuple not working

[phdowling]

First of all, I hope this is the right place for this, if not, just let me know.

I'm trying to create a generic version of a NamedTuple, as follows:

T1 = TypeVar("T1")
T2 = TypeVar("T2")

class Group(NamedTuple, Generic[T1, T2]):
    key: T1
    group: List[T2]

g = Group(1, [""])  # expecting type to be G[int, str]

However, I get the following error:
TypeError: metaclass conflict: the metaclass of a derived class must be a (non-strict) subclass of the metaclasses of all its bases

I'm not sure how else to achieve what I'm trying to do here, or if this might be a bug in the typing mechanism on some level.

Any help?

[ilevkivskyi]

Generic tuple types are not supported in mypy, see #685

In Python 3.7 this should work at runtime, but mypy will still not be able to type check this. Closing as a duplicate of #685