<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _get_auth(self):
 """Return the authorization data for an SNMP request. :returns: A :class:`pysnmp.entity.rfc3413.oneliner.cmdgen.CommunityData` object. """

        if self.version == SNMP_V3:
            # Handling auth/encryption credentials is not (yet) supported.
            # This version supports a security name analogous to community.
            return cmdgen.UsmUserData(self.security)
        else:
            mp_model = 1 if self.version == SNMP_V2C else 0
            return cmdgen.CommunityData(self.community, mpModel=mp_model)