Learn function is not working in pyats 25.1

[luisantoniovillalobos]

Hello team.

I am trying to use learn function in a Cisco Router and I am seeing error related with ios xr parsers.

Below you can find my python script and output errors.

`from pyats.topology.loader import load
from pprint import pp

testbed = load('Router_Omar.yaml') #Cargar el archivo tetsbed
router1 = testbed.devices['Cisco8200'] #Definir el objeto del router
router1.connect() #conectarme al router
output = router1.learn('isis') #Guardar el resultado del feature learn en un objeto
pp(output) #Imprimir el resultado
router1.disconnect() #Desconectarme del dispositivo`

`root@b6a675571f97:/pyats# python learn_example.py

2025-02-21 12:35:12,402: %UNICON-INFO: +++ RB2.8202.41 logfile /tmp/RB2_8202_41-cli-20250221T123512402.log +++

2025-02-21 12:35:12,402: %UNICON-INFO: +++ Unicon plugin iosxr (unicon.plugins.iosxr) +++
The authenticity of host '10.225.251.41 (10.225.251.41)' can't be established.
ECDSA key fingerprint is SHA256:LU8NXqcnuk5wQ2LJmxJ9EC3loda68U+/ifSTK6t5ys4.
Are you sure you want to continue connecting (yes/no/[fingerprint])?

2025-02-21 12:35:13,097: %UNICON-INFO: +++ connection to spawn: ssh -l cisco 10.225.251.41 -p 22, id: 140062886526160 +++

2025-02-21 12:35:13,097: %UNICON-INFO: connection to RB2.8202.41
yes
Warning: Permanently added '10.225.251.41' (ECDSA) to the list of known hosts.
Password:
Last login: Fri Feb 21 15:51:36 2025 from 10.25.128.159

RP/0/RP0/CPU0:RB2.8202.41#

2025-02-21 12:35:14,672: %UNICON-INFO: +++ initializing handle +++

2025-02-21 12:35:14,800: %UNICON-INFO: +++ RB2.8202.41(alias=Cisco8200) with via 'a': executing command 'terminal length 0' +++
terminal length 0
Fri Feb 21 18:35:14.416 UTC
RP/0/RP0/CPU0:RB2.8202.41#

2025-02-21 12:35:15,278: %UNICON-INFO: +++ RB2.8202.41(alias=Cisco8200) with via 'a': executing command 'terminal width 0' +++
terminal width 0
Fri Feb 21 18:35:14.888 UTC
RP/0/RP0/CPU0:RB2.8202.41#

2025-02-21 12:35:15,618: %UNICON-INFO: +++ RB2.8202.41(alias=Cisco8200) with via 'a': configure +++
configure terminal
Fri Feb 21 18:35:15.358 UTC
RP/0/RP0/CPU0:RB2.8202.41(config)#no logging console
RP/0/RP0/CPU0:RB2.8202.41(config)#logging console disable
RP/0/RP0/CPU0:RB2.8202.41(config)#line console
RP/0/RP0/CPU0:RB2.8202.41(config-line)#exec-timeout 0 0
RP/0/RP0/CPU0:RB2.8202.41(config-line)#absolute-timeout 0
RP/0/RP0/CPU0:RB2.8202.41(config-line)#session-timeout 0
RP/0/RP0/CPU0:RB2.8202.41(config-line)#line default
RP/0/RP0/CPU0:RB2.8202.41(config-line)#exec-timeout 0 0
RP/0/RP0/CPU0:RB2.8202.41(config-line)#absolute-timeout 0
RP/0/RP0/CPU0:RB2.8202.41(config-line)#session-timeout 0
RP/0/RP0/CPU0:RB2.8202.41(config-line)#commit
Fri Feb 21 18:35:17.406 UTC
RP/0/RP0/CPU0:RB2.8202.41(config-line)#end
RP/0/RP0/CPU0:RB2.8202.41#

2025-02-21 12:35:18,765: %UNICON-INFO: +++ RB2.8202.41(alias=Cisco8200) with via 'a': executing command 'show isis' +++
show isis
Fri Feb 21 18:35:18.380 UTC

IS-IS Router: b2
System Id: 0000.0000.0041
Hostname: RB2.8202.41
IS Levels: level-2-only
Manual area address(es):
39.752f.0100.0014.0000.9000.0001
Routing for area address(es):
39.752f.0100.0014.0000.9000.0001
Multi-Instance Id: 0
Job Id: 1004
PID: 9293
Respawn count: 1
Started: Tue Jan 14 20:08:56 2025
Null0 ready: Tue Jan 14 20:08:56 2025
LSP MTU: 1492
LSP Full: level-1: No, level-2: No
Non-stop forwarding: Disabled
Most recent startup mode: Cold Restart
TE connection status: Up
XTC connection status: Up
Overload Bit Level-2: configured, set
interarea prefixes suppressed, external prefixes suppressed
always set
set since Jan 14 2025 20:08:56.491 UTC
Maximum Metric: not configured
Topologies supported by IS-IS:
IPv4 Unicast
Rib connected
Level-2
Metric style (generate/accept): Wide/Wide
Metric: 16777214
TE Enabled
No protocols redistributed
Distance: 115
Advertise Passive Interface Prefixes Only: No
IPv6 Unicast
Rib connected
Level-2
Metric style (generate/accept): Wide/Wide
Metric: 16777214
No protocols redistributed
Distance: 115
Advertise Passive Interface Prefixes Only: No
SR-MPLS:
SRLB allocated: 15000 - 15999
SRGB allocated: 400000 - 465000
Interfaces supported by IS-IS b2:
Bundle-Ether441 is running actively (active in configuration)
Bundle-Ether2741 is running actively (active in configuration)
Bundle-Ether4154 is running actively (active in configuration)
Bundle-Ether4171 is running actively (active in configuration)
Loopback0 is running passively (passive in configuration)
RP/0/RP0/CPU0:RB2.8202.41#
Traceback (most recent call last):
File "/pyats/learn_example.py", line 7, in
output = router1.learn('isis') #Guardar el resultado del feature learn en un objeto
File "src/genie/conf/base/device.py", line 637, in genie.conf.base.device.Device.learn
File "/usr/local/lib/python3.10/site-packages/genie/libs/ops/isis/iosxr/isis.py", line 313, in learn
self.make()
File "/usr/local/lib/python3.10/site-packages/genie/ops/base/base.py", line 111, in make
self.maker.make(*args, **kwargs)
File "src/genie/ops/base/maker.py", line 328, in genie.ops.base.maker.Maker.make
File "src/genie/ops/base/maker.py", line 442, in genie.ops.base.maker.Maker._call_parser
File "src/genie/metaparser/_metaparser.py", line 308, in genie.metaparser._metaparser.MetaParser.parse
File "/usr/local/lib/python3.10/site-packages/genie/libs/parser/iosxr/show_isis.py", line 687, in cli
vrf_dict['is_levels'] = is_levels
UnboundLocalError: local variable 'vrf_dict' referenced before assignment`