Check for already Slackware binary packages exist

def auto_detect(self, args):
        """Check for already Slackware binary packages exist
        """
        suffixes = [
            ".tgz",
            ".txz",
            ".tbz",
            ".tlz"
        ]
        if (not args[0].startswith("-") and args[0] not in self.commands and
                args[0].endswith(tuple(suffixes))):
            packages, not_found = [], []
            for pkg in args:
                if pkg.endswith(tuple(suffixes)):
                    if os.path.isfile(pkg):
                        packages.append(pkg)
                    else:
                        not_found.append(pkg)
            if packages:
                Auto(packages).select()
            if not_found:
                for ntf in not_found:
                    self.msg.pkg_not_found("", ntf, "Not installed", "")
            raise SystemExit()