Try Python3.5 by default.

Python 3.0, 3.1, 3.2, and 3.4 not supported however.

run

 #!/bin/sh
-if python3 -V 2>/dev/null; then
+if python3.5 -V 2>/dev/null; then
 	exec python3 -m "sshuttle" "$@"
 else
 	exec python -m "sshuttle" "$@"

sshuttle/ssh.py

@@ -107,7 +107,7 @@ def connect(ssh_cmd, rhostport, python, stderr, options):
         if python:
             pycmd = "'%s' -c '%s'" % (python, pyscript)
         else:
-            pycmd = ("P=python2; $P -V 2>/dev/null || P=python; "
+            pycmd = ("P=python3.5; $P -V 2>/dev/null || P=python; "
                      "exec \"$P\" -c '%s'") % pyscript
         argv = (sshl +
                 portl +