human
Solve the following python programming problem given the following code:
def memoize(timeout = None, fast = False) : 
    '
    Cache a function based on its arguments.

    Args:
        timout: Time the result stays valid in the cache.
    Returns:
        The functions result.
    ' 
    assert ((not fast) or (fast and (fast is not None))), 'You cannot set fast cache without a timeout!' 
    def decorator(f) : 
        '
        Inner decorator
        ' 
        @ wraps (f) 
        def wrapper(* args, **kwargs) : 
            '
            Function cache
            ' 
            if (not kwargs.get ('cache', True)) : 
                kwargs.pop ('cache', None) 
                return f (* args, ** kwargs) 
key = (get_key (f, * args, ** kwargs) if fast else get_mongo_key (f, * args, ** kwargs)) 
            cached_result = get (key, fast = fast) 
            if ((cached_result is None) or no_cache or (fast and timed_out (cached_result))) : 
                function_result = f (* args, ** kwargs) 
                set (key, function_result, timeout = timeout, fast = fast) 
                return function_result 
return (cached_result ['result'] if fast else cached_result) 
return wrapper 
return decorator 

    
    

    Fix the buggy line: assert ((not fast) or (fast and (fast is not None))), 'You cannot set fast cache without a timeout!'
assistant
#Here is Python code to fix the buggy line: assert ((not fast) or (fast and (fast is not None))), 'You cannot set fast cache without a timeout!'
.

assert ((not fast) or (fast and (timeout is not None))), 'You cannot set fast cache without a timeout!'