If you run 'samba-tool -V' it returns 'samba-tool: no such subcommand: -V'

'-V' is a valid subcommand

The fix is:

in samba/netcmd/__init__.py
 
at line 352, replace:
 
                  continue
With:
                 return (self, deferred_args)

Without the 'return' it falls down into:
 
          # We didn't find a subcommand, but maybe we found e.g. --version
          print("%s: missing subcommand\n" % (path), file=self.outf)
          return (self, deferred_args)
 
There is probably a better way of fixing it, but it works for me.