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):
          return self._slack_client.api_call(
              "chat.postMessage",
              channel=channel_id,
              text=message,
              username=username
          )
  
  
  def send_slack_message(slack_token, channel_id, message, username):
      slack_notifier = _SlackNotifier(slack_token)
      return slack_notifier.send_message(channel_id, message, username)
  
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):
          return self._slack_client.api_call(
              "chat.postMessage",
              channel=channel_id,
              text=message,
              username=username
          )
  
  
  def send_slack_message(slack_token, channel_id, message, username):
      slack_notifier = _SlackNotifier(slack_token)
      return slack_notifier.send_message(channel_id, message, username)
  
subject: modify issues from pull request 1