Upgrade Slackware binary packages with new

def upgrade(self, flag):
        """Upgrade Slackware binary packages with new
        """
        for pkg in self.binary:
            try:
                subprocess.call("upgradepkg {0} {1}".format(flag, pkg),
                                shell=True)
                check = pkg[:-4].split("/")[-1]
                if os.path.isfile(self.meta.pkg_path + check):
                    print("Completed!\n")
                else:
                    raise SystemExit()
            except subprocess.CalledProcessError:
                self._not_found("Can't upgrade", self.binary, pkg)
                raise SystemExit(1)