import pysnmp
from pysnmp.hlapi import *


def get_snmp_value(oid, ip, community):
    errorIndication, errorStatus, errorIndex, varBinds = next(
        getCmd(SnmpEngine(),
               CommunityData(community),
               UdpTransportTarget((ip, 161)),
               ContextData(),
               ObjectType(ObjectIdentity(oid)))
    )

    if errorIndication:
        print(errorIndication)
        raise
    elif errorStatus:
        print('%s at %s' % (errorStatus.prettyPrint(), errorIndex and varBinds[int(errorIndex) - 1][0] or '?'))
        raise
    else:
        if isinstance(varBinds[0][1], pysnmp.proto.rfc1905.NoSuchObject):
            return None
        value = varBinds[0][1]
        if isinstance(value, pysnmp.proto.rfc1902.Integer):
            return int(value)