Access pipeline variables in Azure Release for classic python task

RajamannarAanjaram 

To access pipeline variables within a classic Python task in Azure DevOps, you can use the `system` prefix to access the variable. Here's how you can modify your code to retrieve the values of your pipeline variables:

import os

url = os.environ['SYSTEM_URL']
token = os.environ['SYSTEM_TOKEN']
location = os.environ['SYSTEM_LOCATION']
version = os.environ['SYSTEM_VERSION']

In Azure DevOps, pipeline variables are available as environment variables prefixed with `SYSTEM_`. By using the `SYSTEM_` prefix followed by the variable name, you can access the values of pipeline variables within your Python script.

Make sure that the pipeline variables are properly defined and accessible within the pipeline context. Double-check the variable names and ensure they are correctly defined in the pipeline variables section.

By accessing the pipeline variables with the `SYSTEM_` prefix in your Python script, you should be able to retrieve the values without encountering the `KeyError`.