[Samba] Gentoo Linux-installed Samba 4 alpha 21 getting python error

[John Dekowski]

I installed the Samba 4 alpha 21 using the Samba 4 alpha 20 ebuild as a
template:

When I try to run the samba-tool command, I keep getting

*Code:*File "/usr/bin/samba-tool", line 38
    except SystemExit, e:
                     ^
SyntaxError: invalid syntax