False positive unsubscriptable-object with typing.Dict instances

[mthuurne]

Steps to reproduce

Run pylint on the following code:

from typing import Dict

class Translator(Dict[str, str]):
    pass

t = Translator(beep='hello', bloop='world')
print(t['beep'], t['bloop'])

Current behavior

pylint reports:

E1136: Value 't' is unsubscriptable (unsubscriptable-object)
E1136: Value 't' is unsubscriptable (unsubscriptable-object)

Expected behavior

No message is reported, since t acts just like a dict.

pylint --version output

pylint 2.4.0
astroid 2.3.0
Python 3.7.2 (default, Feb 26 2019, 13:02:33) 
[GCC 7.3.1 20180323 [gcc-7-branch revision 258812]]

Note

While superficially similar, this is different from #2849 since there the problem is in subscripting the type, while here subscripting the type is accepted but subscripting the instance is not.

[PCManticore]

Thanks, I can reproduce it as well.

[ZeeD]

Is there an ETA for this issue?

[mthuurne]

I can't reproduce this with the git master versions of PyLint and Astroid, on Python 3.8. I don't understand yet why though.

[AWhetter]

I'm going to close this in favour of #2420 because it covers a wider set of issues associated with inheriting from typing.Dict.