Centos Python2 升级到Python3的简单实现
1.从Python官网到获取Python3的包,切换到目录/usr/local/src
#wgethttps://www.python.org/ftp/python/3.5.1/Python-3.5.1.tar.xz
1xz-dPython-3.5.1.tar.xz 2tar-xfPython-3.5.1.tar.xz
3.在/usr/local路径下创建目录--python3.5,为第4步的安装目录
$mkdir/usr/local/python3.5
4.编译安装
$cd/usr/local/src/Python-3.5.1 #./configure--prefix=/usr/local/python3.5 #makeall #makeinstall #makeclean #makedistclean
5.进入安装的绝对路径,检查是否安装成功
$/usr/local/python3.5/bin/python3.5-VPython3.5.1
6.查看环境变量,启动python时默认按照PATH的顺序进行查找,在/usr/bin中的python此时为Python2.6的。
$echo$PATH /usr/lib/qt-3.3/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin:/home/gordon/bin
7.修改软连接,启动python时指向python3.5
1备份pythonmv/usr/bin/python/usr/bin/python2.6.6 2修改软连接sudoln-s/usr/local/python3.5/bin/python3/usr/bin/python
8.验证默认是否启动python3.5
$python-V Python3.5.1
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