Install-upgrade Slackware binary packages

def bin_upgrade(self):
        """Install-upgrade Slackware binary packages
        """
        packages = self.args[1:]
        options = [
            "-u",
            "--upgradepkg"
        ]
        flag = ""
        flags = [
            "--dry-run",
            "--install-new",
            "--reinstall",
            "--verbose"
        ]
        if len(self.args) > 1 and self.args[0] in options:
            if self.args[1] in flags:
                flag = self.args[1]
                packages = self.args[2:]
            PackageManager(packages).upgrade(flag)
        else:
            usage("")