Simple pysnmp example?

[snippsat]

The error occurs because in version 7.x of pysnmp the API has changed to use asynchronous coroutines rather than returning a synchronous iterator.
In your code, calling next(x) on a coroutine is causing the error since you need to await it.
Try this:

import asyncio
from pysnmp.hlapi.v3arch import *

community_string = 'mystring'
host = 'my_host'

async def snmp_get():
    result = await get_cmd(
        SnmpEngine(),
        CommunityData(community_string),
        UdpTransportTarget.create((host, 161)),
        ContextData(),
        ObjectType(ObjectIdentity('1.3.6.1.2.1.1.5.0')),  # SysName
        lookupMib=False,
        lexicographicMode=False,
    )
    return result

if __name__ == '__main__':
    response = asyncio.run(snmp_get())
    print(response)

Asynchronous API in pysnmp 7.x,the functions get_cmd return a coroutine.
This means that instead of using next() on a synchronous iterator, you must await the coroutine to get the result.
asyncio.run() to execute it,this is the standard way to run asyncio asynchronous code in Python.