If I in a cmd-shell (actually it is 4NT), do: c:>py -3 -V & python3 -V
I get: Requested Python version (3) not installed << ! from py -3 -V Python 3.5.0b2 << ! from the 2nd cmd. What nonsense is this? I DO HAVE Python3 in my %PATH. A Registry setting gone haywire? -- https://mail.python.org/mailman/listinfo/python-list