Getting snmp informations with python script

import sys
from pysnmp.hlapi import *
import csv


def walk(host, oid):
    for (errorIndication, errorStatus, errorIndex, varBinds) in nextCmd(SnmpEngine(), CommunityData('public'),
                                                                        UdpTransportTarget((host, 161), timeout=1,
                                                                                           retries=5), ContextData(),
                                                                        ObjectType(ObjectIdentity(oid)),
                                                                        lexicographicMode=True, lookupNames=True):
        if errorIndication:
            print(errorIndication, file=sys.stderr)
            break
        elif errorStatus:
            print('%s at %s' % (errorStatus.prettyPrint(), errorIndex and varBind[int(errorIndex) - 1][0] or '?'),
                  file=sys.stderr)
            break
        else:
            for varBind in varBinds:
                print(varBind)


def checkserver(ip):
    walk(ip, '1.3.6')


with open('snmplist.csv', newline='', encoding='utf-8') as csvfile:
    reader = csv.reader(csvfile, quoting=csv.QUOTE_ALL)
    for row in reader:
        try:
            print('IP : ' + row[0])
            checkserver(row[0])
        except:
            pass