[issue43118] inspect.signature() raises RuntimeError on failed to resolve the default argument value

[Komiya Takeshi]

Komiya Takeshi <i.tkom...@gmail.com> added the comment:

FWIW, I succeeded to inspect the class with importing the constant from the 
base module as a workaround:

```
import inspect
import io

from io import DEFAULT_BUFFER_SIZE


class MyBufferedReader(io.BufferedReader):
    """buffer reader class."""


inspect.signature(MyBufferedReader)
```

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