old_contents: class Credentials():
      def __init__(self, api_key, account_key):
          self.api_key = api_key
          self.account_key = account_key
  
      def as_params(self):
          return {
              'apiKey': self.api_key,
              'accountKey': self.account_key
          }
  
      def __repr__(self):
          return '{}:\n    api_key={apiKey}\n    accountKey={accountKey})'.format(
              self.__class__.__name__,
              **self.as_params()
          )
  
new_contents: class Credentials():
      def __init__(self, api_key, account_key):
          self.api_key = api_key
          self.account_key = account_key
  
      def as_params(self):
          return {
              'apiKey': self.api_key,
              'accountKey': self.account_key
          }
  
      def __repr__(self):
          return '{}:\n    api_key={apiKey}\n    accountKey={accountKey}'.format(
              self.__class__.__name__,
              **self.as_params()
          )
  
subject: Drop bracket