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

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

Hi Patrick,

I’ve finally pushed pysnmp 4.3.1 to PyPI. Please, re-test and let me know if any issues remain unaddressed.

Another change is a high-level py/SNMP tutorial that is shipped with pysnmp sources and is also available online:

http://pysnmp.sourceforge.net/docs/tutorial.html

> On 28 okt. 2015, at 22:25, Ilya Etingof <il...@gl... <mailto:il...@gl...>> wrote:
> 
>> 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... <mailto: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
>>