Latest beta is now almost Python3-compatible at syntax level, that is
find src/sage -name '*.py' | xargs -n 1 python3 -m py_compileoutputs almost nothing. However, there is now a lambda-line in src/sage/graphs/generators/smallgraphs.py that needs Python2.
Please check you syntax against Py3 when making patches. That will save time later.
-- Jori Mäntysalo
