Stash operator from the version, if any.

        :return:

def _set_version(self, version):
        '''
        Stash operator from the version, if any.

        :return:
        '''
        if not version:
            return

        exact_version = re.sub(r'[<>=+]*', '', version)
        self._op = version.replace(exact_version, '') or None
        if self._op and self._op not in self.Z_OP:
            raise CommandExecutionError('Zypper do not supports operator "{0}".'.format(self._op))
        self.version = exact_version