import timeimport functoolsdef clock(func):    @functools.wraps(func)#还原被装饰函数的__name__和__doc__属性    def clocked(*args,**kwargs):#支持关键字参数        t0 = time.perf_counter()        result = func(*args,**kwargs)        elapsed = time.perf_counter()- t0        name = func.__name__        arg_lst = []        if args:            arg_lst.append(','.join(repr(arg) for arg in args))        if kwargs:            pairs = ['%s = %r' % (k,w) for k,w in sorted(kwargs.items())]            arg_lst.append(','.join(pairs))        arg_str = ','.join(arg_lst)        print('[%0.8fs]%s(%s) -> %r' % (elapsed,name,arg_str,result))        return result    return clocked@functools.lru_cache(maxsize=128,typed = False) #把耗时的函数结果保存起来，避免传入相同的参数重新计算,typed=true，把浮点数和整数分开保存@clockdef fibonacci(n):    if n <2:        return n    return fibonacci(n-2) + fibonacci(n-1)if __name__ == '__main__':    print(fibonacci(30))