#!/usr/bin/env python
# -*- coding: utf-8 -*-
'''
@Auther :liuyuqi.gov@msn.cn
@Time :2018/4/14 4:57
@File :test3.py
'''

num = 9

def f1():
    # global num
    num = 20

def f2():
    print num


f2()
f1()
f2()