is there a function for `variable_group_variable_update` ?

Goal

Update variable group variable using the provided python SDK

Summary

The basis of this issue/question is to understand if there is a function function within the azure-devops sdk for updating a variable within a variable group. When inspecting the azure-devops-cli-extension i'm able to see see that the cli is power by python. I'm also able to see that you can update a variable within a variable group using the azure-devops-cli. Which means there is a python function for updating variable groups within a variable group - variable_group_variable_update

With that research and understanding out of the way I jump back to the azure-devops-python-api knowing its possible to update a variable within a variable group. First, I start looking at the REST API which the python sdk is using, specifically for variable groups. After reading over the API docs a few times i'm unable to find anything explicitly calling out updating variables within a variable group.

With no help within the docs what do you do next? Search the internet forums for anyone who has had better luck than I. I discovered users stating they were able to update variables within a variable group but when I try to reproduce their code using python i'm getting different results. Well, mainly errors but it's getting me closer than what the docs provide.

import requests

username = "username"
password = "password"

pjson = {
        "variables": {
          "fingerscrosse-job": {
            "value": "wishes"
    },
    "special": {
      "value": "new value"
    }
        },
        "type": "Vsts",
        "name": "XXX-TEST",
         "description": "testing vars"
      }

url = "https://dev.azure.com/carmaxpricing/nemesis/_apis/distributedtask/variablegroups/1?api-version=5.0-preview.1"
headers = {'Content-Type': 'application/json'}
r = requests.post(url, json = pjson, auth=(username, password))
print(r.text)

RESPONSE

{"$id":"1","innerException":null,"message":"Variable group 'XXX-TEST' already exists.","typeName":"Microsoft.TeamFoundation.DistributedTask.WebApi.VariableGroupExistsException, Mi
crosoft.TeamFoundation.DistributedTask.WebApi","typeKey":"VariableGroupExistsException","errorCode":0,"eventId":3000}

If you notice in my code i'm not using the SDK because there is no function for updating a variable within a variable group that i'm aware of. Anyway, i'm getting an error stating ...already exists. So this api is for updating variable groups, not updating variables within a variable group, right? The real question is where is the function within THIS SDK for updating variables within a variable group? please advise - Confused Engineer

Notes

• Tried multiple different REST API versions
• No function under the task_agent_client() for updating variable in variable group. but there is update_variable_group
• Creating NEW variable groups with variables works

從 task_agent_client() 及其 update_variable_group 進入點開始，然後將其行為與 azure-devops-cli-extension 中的 variable_group.py 進行比較。針對連結的 REST API 重現已記錄的要求，並判斷是否支援透過 SDK 更新變數。完成標準是：明確記錄受支援的進入點和要求格式，或找出需要實作的缺少功能。