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

[Ilya E. <il...@gl...>]

I’m looking to push it up there by the coming weekend, but not quite sure I get enough time for regression. I’ll send a note to this list as it’s done.

> On 28 Oct 2015, at 22:19, Patrick Ogenstad <pa...@og...> wrote:
> 
> 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... <mailto: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 <http://pysnmp.cvs.sourceforge.net/viewvc/pysnmp/pysnmp/?view=tar>
>>> On 28 Oct 2015, at 20:34, Patrick Ogenstad <pa...@og... <mailto: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