Hot to read from local.settings.json

I have local.settings.json like below in my folder.

{
  "IsEncrypted": false,
  "Values": {
    "FUNCTIONS_WORKER_RUNTIME": "python",
    "AzureWebJobsStorage": "UseDevelopmentStorage=true",
    "DATABASE": "DW_TEST"
  }
}

When I try to read it os.environ.get("DATABASE"), I am getting None