new_contents: class InvalidFilter(Exception):
      """
      Raise when 'filter' key word argument is not recognized
      """
      pass
  
  
  class InvalidHero(Exception):
      """
      Raise when 'hero' key word argument is not recognized
      """
      pass
  
  
  class InvalidCombination(Exception):
      """
      Raise when 'filter' and 'hero' key word arguments
      are an invalid combination.
      """
      pass
  
  
  class NotFound(Exception):
      """
      Raise when stats could not be found
      """
      pass
  
subject: Add custom exceptions for api errors