old_contents: from .io import IOAdapter
  
  
  class MultiIOAdapter(IOAdapter):
  
      def __init__(self, **kwargs):
          super(MultiIOAdapter, self).__init__(**kwargs)
  
          self.adapters = []
  
      def process_input(self, *args, **kwargs):
          """
          Returns data retrieved from the input source.
          """
          if self.adapters is not []:
              return self.adapters[0].process_input(*args, **kwargs)
  
      def process_response(self, statement):
          """
          Takes an input value.
          Returns an output value.
          """
          for adapter in self.adapters:
              adapter.process_response(statement)
  
          return self.adapters[0].process_response(statement)
  
      def add_adapter(self, adapter):
          self.adapters.append(adapter)
  
      def set_context(self, context):
          """
          Set the context for each of the contained io adapters.
          """
          super(MultiIOAdapter, self).set_context(context)
  
          for adapter in self.adapters:
              adapter.set_context(context)
  
new_contents: from .io import IOAdapter
  
  
  class MultiIOAdapter(IOAdapter):
  
      def __init__(self, **kwargs):
          super(MultiIOAdapter, self).__init__(**kwargs)
  
          self.adapters = []
  
      def process_input(self, *args, **kwargs):
          """
          Returns data retrieved from the input source.
          """
          if self.adapters is not []:
              return self.adapters[0].process_input(*args, **kwargs)
  
      def process_response(self, statement):
          """
          Takes an input value.
          Returns an output value.
          """
          for i in range(1, len(self.adapters)):
              self.adapters[i].process_response(statement)
  
          return self.adapters[0].process_response(statement)
  
      def add_adapter(self, adapter):
          self.adapters.append(adapter)
  
      def set_context(self, context):
          """
          Set the context for each of the contained io adapters.
          """
          super(MultiIOAdapter, self).set_context(context)
  
          for adapter in self.adapters:
              adapter.set_context(context)
  
subject: Fix first io adapter being called twice.