code: def add_prepare_handler(self, prepare_handlers):
          
          if not isinstance(prepare_handlers, static_bundle.BUNDLE_ITERABLE_TYPES):
              prepare_handlers = [prepare_handlers]
          if self.prepare_handlers_chain is None:
              self.prepare_handlers_chain = []
          for handler in prepare_handlers:
              self.prepare_handlers_chain.append(handler)
docs: Add prepare handler to bundle
  
          :type: prepare_handler: static_bundle.handlers.AbstractPrepareHandler