code: def create_topic(topic_name) -> str:
      return boto3.client("sns").create_topic(Name=topic_name)[
          "TopicArn"
      ]
  
file_path: airflow/tests/system/providers/amazon/aws/example_sns.py
imports: from __future__ import annotations
  from datetime import datetime
  import boto3
  from airflow.decorators import task
  from airflow.models.baseoperator import chain
  from airflow.models.dag import DAG
  from airflow.providers.amazon.aws.operators.sns import SnsPublishOperator
  from airflow.utils.trigger_rule import TriggerRule
  from tests.system.providers.amazon.aws.utils import SystemTestContextBuilder
  from tests.system.utils import get_test_run
label_desc: Use image node_id 1 for calling a global function with example usage: create_topic(topic_name) and returns: boto3