code: def run_once(func):
      ''' Decorator for making sure a method can only be executed once '''
      def wrapper(*args, **kwargs):
          if not wrapper.has_run:
              wrapper.has_run = True
              return func(*args, **kwargs)
      wrapper.has_run = False
      return wrappef run_once(func):
      ''' Decorator for making sure a method can only be executed once '''
      def wrapper(*args, **kwargs):
          if not wrapper.has_run:
              wrapper.has_run = True
              return func(*args, **kwargs)
      wrapper.has_run = False
      return wrapper
docs: Decorator for making sure a method can only be executed once