#!/usr/bin/env python
# -*- coding:utf-8 -*-
'''
def f1():
return "f1"
def f2():
r=f1()
return r
def f3():
r=f2()
return r
def f4():
r = f3()
return r
ren = f4()
'''
'''
#菲波那切数列
def f4(a1,a2):
print(a1,a2)
a3 = a1 + a2
f4(a2,a3)
f4(0,1)
'''
#写一个函数,获取斐波那契数列第十个数
def f5(depth,a1,a2):
if depth==10:
return a1
a3 = a1+a2
r = f5(depth + 1,a2,a3)
return r
ret = f5(1,0,1)
print(ret)