Python code using pysnmp library to set interface description on a network device

set_interface_description.py

import pysnmp



def set_snmp_single(rwstring, ip_address, ifAlias, description):
    from pysnmp.entity.rfc3413.oneliner import cmdgen
    from pysnmp.proto import rfc1902
    cmdGen = cmdgen.CommandGenerator()
    cmdGen.setCmd(
        cmdgen.CommunityData(rwstring),
        cmdgen.UdpTransportTarget((ip_address, 161)),
        (ifAlias, rfc1902.OctetString(description)))

def set_interface_description(ipaddress, ifIndex, descr):
    """
    Issues SNMP SET Command to change the description on a interface of device
    :param ifIndex: type int
    :param descr: type string
    :return: None
    """
    ip_address = ipaddress
    community_string = 'private'
    snmp_port = 161
    ifIndex = str(ifIndex)
    descr = descr
    ifAlias = str("1.3.6.1.2.1.31.1.1.1.18." + ifIndex)
    set_snmp_single(community_string, ip_address, ifAlias, descr)