text: class ResourceDepletionError(Exception):
  
      def __init__(self):
          Exception.__init__(self)
  
      def __str__(self):
          return repr('The proxy source is exhausted')
  
  
  class PoolEmptyError(Exception):
  
      def __init__(self):
          Exception.__init__(self)
  
      def __str__(self):
          return repr('The proxy pool is empty')
  