netmiko import pysnmp error

[phw50365036]

Description of Issue/Question

I have netmiko4.4.0 and pysnmp6.2.4 installed, and when I run the project, I get an error: pysnmp not installed; please install it: 'pip install pysnmp'
The investigation found that:
The source code is like this package import:
from pysnmp.entity.rfc3413.oneliner import cmdgen
In pysnmp6.2.4, cmdgen has a cmdgen.py file in the path: pysnmp/entity/rfc3413
netmiko4.4.0 was released on July 9, 2024.
pysnmp> 5.* versions are all released after July 17, 2024.
If I use pysnmp earlier than 6.2.2, there is no problem, it appears that the pysnmp author changed the file structure in 6.2.2

Setup

Netmiko version

netmiko==4.4.0

Netmiko device_type (if relevant to the issue)

(Paste device_type between quotes below)

pysnmp==6.2.4

Steps to Reproduce the Issue

Error Traceback

(Paste the complete traceback of the exception between quotes below)

File "/home/new_autonet/autonet/urls.py", line 19, in <module>
    from application.config_task_manage.views import EmailSignView
  File "/home/new_autonet/application/config_task_manage/views.py", line 17, in <module>
    from core.system_manage.system_handle import get_session_aaa_data
  File "/home/new_autonet/core/system_manage/system_handle.py", line 18, in <module>
    from utils.common.auths import NetAuths
  File "/home/new_autonet/utils/common/auths.py", line 25, in <module>
    from netmiko.snmp_autodetect import SNMPDetect
  File "/usr/local/lib/python3.9/site-packages/netmiko/snmp_autodetect.py", line 32, in <module>
    raise ImportError("pysnmp not installed; please install it: 'pip install pysnmp'")
ImportError: pysnmp not installed; please install it: 'pip install pysnmp'

Relevant Python code

(Please try to essentialize your Python code to the minimum code needed to reproduce the issue)
(Paste the code between the quotes below)

[ktbyers]

Okay...makes sense for 5+ years there were no updates to pysnmp and then in July 2024 they released a version 5 and a version 6.

So what is needed.

• A PR to add support for pysnmp version 6 (and maybe 5) in Netmiko

In order to use the current released version of Netmiko, a user would need to install and use the older version of pysnmp (since it looks like they made a backwords incompatible change).

[Tonygratta]

I am working on a fix for this issue now. However, at the moment, I am experiencing some troubling exceptions when testing on Python 3.8 and 3.9 on Windows due to an issue with Python asyncio (python/cpython#92841).
Despite the exceptions, the code is still working. I am wondering if it is really necessary to fix this issue for this specific case. There might be some "dirty" solutions like this:

import sys
if sys.version_info[0] == 3 and sys.version_info[1] <= 9 and sys.platform == 'win32':
    # patch for windows 3.8-3.9 python bug https://github.com/python/cpython/issues/92841
    asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())

Any suggestions?

[phw50365036]

My project is running in linux, I think I have encountered a very similar problem with you, it seems that the task has ended, but the asynico of asynchronous management mistakenly thinks that the task has not ended, unfortunately: I didn't know much about python's asyncism, so I asked GPT, and it suggested writing programs to cancel tasks, so I was wondering if it was possible to give tasks a name when adding tasks, and use code to cancel the corresponding tasks when a certain task already has a return value. I don't know if it's feasible, but I hope it can give you some inspiration.

[ktbyers]

@Tonygratta Yeah, I wouldn't think fixing that is necessary from Netmiko's perspective.

[Bierchermuesli]

I guess the pysnmp error should be fixed with #3473. In the meantime pysnmp >7.x was released.

Ilya, the original pysnmp author, sadly passed away. This might be the reason for the long (now short) release cycle. new pip releases are published from lextudio fork.