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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def gid(self):
 """Return the group id that the daemon will run with :rtype: int """

        if not self._gid:
            if self.controller.config.daemon.group:
                self._gid = grp.getgrnam(self.config.daemon.group).gr_gid
            else:
                self._gid = os.getgid()
        return self._gid