#!/usr/bin/env python

import random
import os
import string

allchoice = string.letters + string.digits
#print allchoice

"""
郵件正文，後面展現string.Template()的用法
"""
content = """your acccount is created
username is $user
password is $pwd"""
""" 
8位隨機密碼生成
"""
def pwdgen(num = 8):
    pwd = ''
    for i in range(num):
        pwd += random.choice(allchoice)
    #print pwd
 

    return pwd

if __name__=='__main__':
    password = pwdgen()
    username = raw_input('input your name:')
    os.system('useradd %s' % username) #os.system('')可以呼叫系統命令
    os.system('echo %s | passwd --stdin %s' % (password,username))
    t = string.Template(content)#建立模板
    os.system("echo '%s' | mail -s 'create user' root"
 
 % t.substitute(user=username,pwd=password))#模板內容替換