NLTK has plenty of abstract base classes. Now that Python has support for these, we need to audit the codebase and adopt this syntax.
Thanks @mrecachinas and @kmike for https://github.com/nltk/nltk/pull/1223. It looks like we have a model that can be applied across the toolkit now.
@stevenbird Is the issue fixed?
@stevenbird it seems that this issue has been fixed, it might be useful to close it.
Thanks @souravsingh, @gmotzespina!