Azure function python app - getting nested environments variables

Question

I have an azure function app written in python that does not return environment variables from other sections than values.

localsettings.json:

{
  "IsEncrypted": false,
  "IBAN": {
    "API_KEY": "xx",
    "CURRENCY": "USD"
  }, 
  "Values": {
    "AzureWebJobsStorage": "",
    "FUNCTIONS_WORKER_RUNTIME": "python",
    "APPINSIGHTS_CONNECTION_STRING": "InstrumentationKey=xx-xx-xx-9c3c-4d3c4d3c4d3c",

  }
}

I have tried:

os.getenv('IBAN:API_KEY', '')
and
os.getenv('IBAN_API_KEY', '')

Both fails getting value. Is it not an option like in .NET to use nested sections in python?

Answer 1

Environment variables should be added under Values section in local.settings.json.

You can configure the nested environment variables in two ways.

1. Using colon(:) i.e.,IBAN:API_KEY
2. Using double underscore(__) i.e., IBAN__API_KEY.

local.settings.json:

{
  "IsEncrypted": false,
  "Values": {
    "FUNCTIONS_WORKER_RUNTIME": "python",
    "AzureWebJobsFeatureFlags": "EnableWorkerIndexing",
    "AzureWebJobsStorage": "UseDevelopmentStorage=true",
    "IBAN:API_KEY": "xx",
    "IBAN:CURRENCY": "USD"
  }
}

function_app.py:

app = func.FunctionApp()

@app.route(route="http_trigger", auth_level=func.AuthLevel.ANONYMOUS)
def http_trigger(req: func.HttpRequest) -> func.HttpResponse:
    logging.info('Python HTTP trigger function processed a request.')
    
    logging.info('API KEY: '+os.getenv("IBAN:API_KEY"))
    logging.info('CURRENCY: '+os.getenv("IBAN:CURRENCY"))

    name = req.params.get('name')
    if not name:
        try:
            req_body = req.get_json()
        except ValueError:
            pass
        else:
            name = req_body.get('name')

    if name:
        return func.HttpResponse(f"Hello, {name}. This HTTP triggered function executed successfully.")
    else:
        return func.HttpResponse(
             "This HTTP triggered function executed successfully. Pass a name in the query string or in the request body for a personalized response.",
             status_code=200
        )

Output:

Functions:

        http_trigger:  http://localhost:7071/api/http_trigger

For detailed output, run func with --verbose flag.
[2025-01-23T07:08:43.699Z] Executing 'Functions.http_trigger' (Reason='This function was programmatically called via the host APIs.', Id=ffdb7321-216b-4d15-960a-8b1dfd38aaf7)
[2025-01-23T07:08:43.776Z] Python HTTP trigger function processed a request.
[2025-01-23T07:08:43.776Z] CURRENCY: USD
[2025-01-23T07:08:43.776Z] API KEY: xx
[2025-01-23T07:08:43.845Z] Executed 'Functions.http_trigger' (Succeeded, Id=ffdb7321-216b-4d15-960a-8b1dfd38aaf7, Duration=169ms)