#__author__:Administrator} #a: 2017/11/ # def jie(n): #     if n==1: #         return 1 #     return n*jie(n-1) # # print(jie(5)) #飞播那期数列：0，1，1，2，3，5，8，13，21 def fibo(n):     befo = 0     after = 1     for i in range(n-2):         sum = after+befo         befo = after         after = sum     return sum print(fibo(5))