old_contents: from slackclient import SlackClient
  
  
  class SlackNotifier:
      def __init__(self, slack_token):
          self._slack_client = SlackClient(slack_token)
  
      def send_message(self, channel_id, message, username):
          try:
              api_response = self._slack_client.api_call(
                  "chat.postMessage",
                  channel=channel_id,
                  text=message,
                  username=username
              )
              if api_response['ok'] is True:
                  response = {
                      'success': 1,
                      'return': api_response['message']
                  }
              else:
                  response = {
                      'success': 0,
                      'error': api_response['error']
                  }
          except Exception as e:
              response = {
                  'success': 0,
                  'error': str(e)
              }
          return response
  
  
new_contents: from slackclient import SlackClient
  
  
  class SlackNotifier:
      def __init__(self, slack_token):
          self._slack_client = SlackClient(slack_token)
  
      def send_message(self, channel_id, message, username):
          try:
              api_response = self._slack_client.api_call(
                  "chat.postMessage",
                  channel=channel_id,
                  text=message,
                  username=username
              )
              if api_response['ok'] is True:
                  response = {
                      'success': 1,
                      'return': api_response['message']
                  }
              else:
                  response = {
                      'success': 0,
                      'error': api_response['error']
                  }
          except Exception as e:
              response = {
                  'success': 0,
                  'error': str(e)
              }
          return response
  
subject: fix line