Following up to myself: I finally did the right keyword search, and found a relevant article:
http://stackoverflow.com/questions/13905741/accessing-class-variables-from-a-list-comprehension-in-the-class-definition Maybe I HAVE tried to define a list comprehension inside a class definition before. What I tried to do would have apparently worked in Python 2. But in Python 3, the namespace behavior has changed (and I'm still reading the article to understand how and why). I guess that I could define my objects as globals... now, why would Python force me into doing that? :^( -- https://mail.python.org/mailman/listinfo/python-list
