????#?生成器方法耗時(shí)
????t3?=?time.time()
????f=fab2(maxnum)
????while?True:
????????try:
????????????x?=?next(f)
????????except?StopIteration?as?e:
????????????break
????t4?=?time.time()
????print('fab2?total?tims?%.2f?'?%?(1000*(t4-t3))?+?'?ms')

這樣調(diào)用才正確,結(jié)果是yield更慢,因?yàn)橐却齨ext()的調(diào)用

我運(yùn)行的幾次結(jié)果:

fab1?total?tims?116.01??ms
fab2?total?tims?128.01??ms