fix python-3.5 syntax (python.org/dev/peps/pep-0448/)
fix python-3.5 syntax (python.org/dev/peps/pep-0448/)

mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs,mancoast/cado-nfs