code: def cached(f):
      
  
      cache = f.cache = {}
  
      @functools.wraps(f)
      def decorator(*args, **kwargs):
          key = str(args) + str(kwargs)
          if key not in cache:
              cache[key] = f(*args, **kwargs)
          return cache[key]
      return decorator
docs: Cache decorator for functions taking one or more arguments.
      :param f: The function to be cached.
      :return: The cached value.