old_contents: class APIConnectionError(Exception):
      pass
  
  
  class ProducerAPIError(APIConnectionError):
      pass
  
  
  class ConsumerAPIError(APIConnectionError):
      pass
new_contents: class APIConnectionError(Exception):
      pass
  
  
  class ProducerAPIError(APIConnectionError):
      pass
  
  
  class ConsumerAPIError(APIConnectionError):
      pass
  
subject: make flake8 happy