Eric V. Smith <e...@trueblade.com> added the comment:
You can also cause this same error without dataclasses:
from typing import TypeVar, Generic
from types import new_class
MyTypeVar = TypeVar("MyTypeVar")
MyParent = new_class("MyParent", (Generic[MyTypeVar],), {})
c = type('MyChild', (MyParent[int],), {}) # error in 3.8
I assume you get the same error in 3.7, but I can't compile it just now.
The above code works in 3.6. And the code in dataclass_metaclass_issue.py works
in 3.6, using the backported dataclasses.py from PyPI.
So it seems this is a typing problem, not a dataclasses problem.
+Ivan, in case he has some insights.
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nosy: +levkivskyi
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<https://bugs.python.org/issue33188>
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