Code review comment for ~ahasenack/ubuntu/+source/tdb:disco-tdb-1.3.18

waf cleanup is fine, but given how much you list don't you want to convert it to just
  $ find ... -name .pyc -delete
or something like that?
Considering that you also clear directories maybe:
 $ find -name ".pyc" -o -name "__pycache__" -exec rm {} \;