Problem inheriting attribute from a generic and non-generic base class

[dmzkrsk]

from typing import Generic, TypeVar, NamedTuple


T = TypeVar('T')


class Node(Generic[T]):
    v: T


class IntegerNode(Node[int], NamedTuple('IntegerNode', [('v', int)])):
    pass

Gives me an error:

11: error: Definition of "v" in base class "Node" is incompatible with definition in base class "IntegerNode@11"

[JukkaL]

Thanks for reporting this! This looks like a bug in mypy.

This is tangentially related to #685 but looks like a separate issue.

[pkch]

This is unrelated to NamedTuple:

class Base1(Generic[T]):
    v: T

class Base2:
    v: int

class C(Base1[int], Base2):  # error
    pass

The error is the same: : Definition of "v" in base class "Base1" is incompatible with definition in base class "Base2"

[ilevkivskyi]

This has been fixed recently, the example now passes on current master.