docs: 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