Chris

## Describe the bug ## I was attempting to write a Win7 installation .iso to a USB drive. For safety I usually specify disk devices as `/dev/disk/by-id/...` instead of `/dev/sd[abcd]`...

enumerating concrete subclasses of an abstract base class causes false positive "Cannot instantiate abstract class X with abstract attribute Y"

1

I have a number of concrete classes which all derive from the same abstract base class. Creating a list of instances using `__subclasses__()` in a list comprehension, mypy complains that...