If you've ever wondered what it might be like to contribute to an open source project on GitHub, here's a nice little task to try your hand on for NLTK. You'd need some facility with command line tools (e.g. Unix shell aka terminal) plus a free GitHub account.
https://github.com/nltk/nltk/issues/1309
With thanks to Liling Tan for setting up this task and explaining it in the link above.
-Steven Bird