Gist to showcase configuration to trigger error in terraform

tf_0_11_error.tf

resource "null_resource" "write_py" {
  triggers {
    time = "${timestamp()}"
  }
  provisioner "local-exec" {
    command = <<PYTHON

echo "import json
from concurrent.futures import ThreadPoolExecutor
from time import sleep


def long_running():
    sleep(10)


def do_some_work():
    with ThreadPoolExecutor(2) as worker:
        worker.submit(long_running)
        worker.submit(long_running)
    return True


def notify_terraform(status: bool = False):
    print(json.dumps({
        'status': status
    }))


if __name__ == "__main__":
    work_result = do_some_work()
    notify_terraform(work_result)
">${path.module}/something.py
PYTHON
  }
}

data "external" "test_python" {
  program = [
    "python3",
    "${path.module}/something.py"
  ]
  depends_on = [
    "null_resource.write_py"
  ]
}

output "result_of_python_test" {
  value = "${data.external.test_python.result.status}"
}