code: def send_slack_message(message):
      
  
      if 'SLACK_WEB_HOOK' not in os.environ:
          raise EnvironmentError("Could not find SLACK_WEB_HOOK environment variable")
  
      webhook = os.environ['SLACK_WEB_HOOK']
  
      r = requests.post(webhook, json={'text':message, 'username': 'Release Bot'})
      if r.status_code != 200:
          raise RuntimeError("Could not post message to slack channel")
docs: Send a message to the slack channel #coretools