Python 创建函数和代码重用

1. cat func.py

#!/usr/bin/python

def func():
        print "hello,this is a function"

def func2():
        for i in range(10):
                print "this will show function 10 times"
                func()

def addtion():
        sum=2+1
        print "1 + 1 = %s" %sum

func2()
addtion()

2. cat pysysinfo.py

#!/usr/bin/env python

import subprocess
def uname_func():
        uname="uname"
        uname_arg="-a"
        print "gathering system info with %s command:\n" % uname
        subprocess.call([uname,uname_arg])

def disk_func():
        diskspace = "df"
        diskspace_arg = "-h"
        print "gathering disk info %s command:\n" % diskspace
        subprocess.call([diskspace,diskspace_arg])

def main():
        uname_func()
        disk_func()

if __name__=="__main__":
        main()

3. cat new_pysysinfo.py

#!/usr/bin/env python
from pysysinfo import disk_func
import subprocess

def tmp_space():
        tmp_usage="du"
        tmp_arg="-h"
        path="/tmp"
        print "space used in /tmp dir"
        subprocess.call([tmp_usage,tmp_arg,path])

def main():
        disk_func()
        tmp_space()

if __name__=="__main__":
        main()

注：代码 [if __name__=="__main__":] 的使用，使你可以只调用某脚本中的单一函数。