Re: [pysnmp-users] UnboundLocalError: local variable 'errorIndication' referenced before assignment

[Patrick O. <pa...@og...>]

Thanks!

Do you have any estimate as to when 4.3.1 will be on pypi and able to be installed by pip?

> On 28 okt. 2015, at 21:37, Ilya Etingof <il...@gl...> wrote:
> 
> Hi Patrick,
> 
> That issue has been fixed in 4.3.1. Please try it out and let me know in case of further issues:
> 
> tarball download
> 
>> On 28 Oct 2015, at 20:34, Patrick Ogenstad <pa...@og...> wrote:
>> 
>> Hello,
>> 
>> I ran into a problem after upgrading to pysnmp 4.3.0.
>> 
>> Just running snmpwalk it looks like this:
>> 
>> $ snmpwalk -v2c -c public 172.29.50.5 1.3.6.1.4.1.9.9.46.1.4.2
>> SNMPv2-SMI::enterprises.9.9.46.1.4.2 = No Such Object available on this agent at this OID
>> 
>> The problem seems to be when you run a nextCmd against an object which currently doesn't exist.
>> 
>> The code below works with pysnmp 4.2.5
>> 
>> from pysnmp.entity.rfc3413.oneliner import cmdgen
>> cmdGen = cmdgen.CommandGenerator()
>> 
>> errorIndication, errorStatus, errorIndex, varBindTable = cmdGen.nextCmd(
>>     cmdgen.CommunityData('public'),
>>     cmdgen.UdpTransportTarget(('172.29.50.5', 161)),
>>     '1.3.6.1.4.1.9.9.46.1.4.2',
>>     lookupMib=False,
>> )
>> 
>> if errorIndication:
>>     print(errorIndication)
>> else:
>>     if errorStatus:
>>         print('%s at %s' % (
>>             errorStatus.prettyPrint(),
>>             errorIndex and varBindTable[-1][int(errorIndex)-1] or '?'
>>             )
>>         )
>>     else:
>>         for varBindTableRow in varBindTable:
>>             for name, val in varBindTableRow:
>>                 print('%s = %s' % (name.prettyPrint(), val.prettyPrint()))
>> 
>> As the object doesn't exist on the device nothing is printed out. However running the same code with 4.3.0 gives this error:
>> 
>> Traceback (most recent call last):
>>   File "<stdin>", line 5, in <module>
>>   File "/Users/patrick/.virtualenvs/prod/lib/python2.7/site-packages/pysnmp/entity/rfc3413/oneliner/cmdgen.py", line 222, in nextCmd
>>     return errorIndication, errorStatus, errorIndex, varBindTable
>> UnboundLocalError: local variable 'errorIndication' referenced before assignment
>> 
>> Is this something which can be solved in an easy way?
>> 
>> Best regards
>> Patrick