If you have the time/will, I would suggest to overhaul build to from 7 to new debhelper 13 with the automagic "%: dh $@" rule.
Almost all other Python projects have already been converted. wc -l */debian/rules 29 lincity-ng/debian/rules 25 lmfit-py/debian/rules 21 logbook/debian/rules 28 logilab-constraint/debian/rules 35 love/debian/rules 21 ltris/debian/rules 15 lua-lpeg/debian/rules 13 magic-wormhole/debian/rules 206 matplotlib/debian/rules 14 mdp/debian/rules 18 microsoft-authentication-library-for-python/debian/rules 56 minetest/debian/rules 13 mir-eval/debian/rules 12 mrrescue/debian/rules 18 mu-cade/debian/rules