一键升级python

郑重声明如有雷同纯属巧合，本人自学的没有任何编程经验 ，写的不好 随便喷 。废话不多说，直接上代码。

实验环境：

Cent  OS 6.5

python 2.6.6(系统默认的)

目前提供安装的版本是2.7.8或者3.5.2

#!/usr/bin/python

#coding=utf-8
import os
import sys

if os.getuid() == 0:
    pass
else:
    print'当前用户不是root用户,请以root用户脚本执行'

    sys.exit()

print '++++++++++++++++准备工作:配置本地YUM源+++++++++++++++++++'

cmd = os.path.exists('/media/cdrom/')
if cmd != True:
    cmd = 'mkdir /media/cdrom'
    os.system(cmd)
    print '目录创建完毕！！！'
else:
    print '目录已经有，无需创建！！！'


print '++++++++++++++++安装所需的依赖包++++++++++++++++++++++++'
print '请把光盘放入光驱内'


cmd = 'mount /dev/cdrom /media/cdrom/'
os.system(cmd)
cmd = 'yum install -y openssl** openssl-devel readline-devel zlib-devel gcc* -y'
os.system(cmd)
print '+++++++++++++++依赖包安装成功+++++++++++++++++++++++++++'

list_file = os.listdir('.')
print list_file
version = raw_input('请输入你想安装的python版本(2.7.8/3.5.2)')
package_name = 'Python-'+version
print package_name
if version == '2.7.8':
    url = 'wget https://www.python.org/ftp/python/2.7.8/Python-2.7.8.tgz'
elif version == '3.5.2':
    url = 'wget https://www.python.org/ftp/python/3.5.2/Python-3.5.2.tgz'
else:
    print '你输入的版本号有误，请核对后重新输入！！！'
    sys.exit(1)


cmd = 'tar -zxf '+package_name+'.tgz'+'&& cd '+package_name+'&& ./configure && make && make install'
command = 'mv /usr/bin/python /usr/bin/python2.6 && ln -s /usr/local/bin/python2.7 /usr/bin/python '+'&& sed -i '+'s/pyhton/pyhton2.6/g'+' /usr/bin/yum'
if package_name+'.tgz' in list_file:
    print '当前目录有了安装包了不用下载了，正在安装请稍等..........'


    os.system(cmd)
    os.system(command)
    print '恭喜你升级到'+package_name
    
elif package_name+'.tgz' not in list_file:
    print '正在下载安装包，准备安装！！！'
    os.system(url)
    print '下载完成，正在安装.......................'
    os.system(cmd)
    os.system(command)
    print '恭喜你升级到'+package_name
    res = os.system(url)
    if res != 0:
        print '下载失败，请检查网络'