<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def addMibSource(self, *mibSources):
 """Adds path to repository to search PySNMP MIB files. Parameters *mibSources : one or more paths to search or Python package names to import and search for PySNMP MIB modules. Returns ------- : :py:class:`~pysnmp.smi.rfc1902.ObjectIdentity` reference to itself Notes ----- Normally, ASN.1-to-Python MIB modules conversion is performed automatically through PySNMP/PySMI interaction. ASN1 MIB modules could also be manually compiled into Python via the `mibdump.py <http://snmplabs.com/pysmi/mibdump.html>`_ tool. Examples -------- ObjectIdentity('SNMPv2-MIB', 'sysDescr') """

        if self._mibSourcesToAdd is None:
            self._mibSourcesToAdd = mibSources

        else:
            self._mibSourcesToAdd += mibSources

        return self