linux python升级及全局环境变

1、下载python wget https://www.python.org/ftp/python/3.4.5/Python-3.4.5.tgz 或者去官网下载压缩包

2、安装python3依赖 yum install openssl-devel bzip2-devel expat-devel gdbm-devel readline-devel sqlite-devel

3、解压安装 tar -xzvf Python-3.4.5.tgz ./configure –prefix=/usr/local/Python3 make make install

4、老版本py2备份 mv /usr/bin/python /usr/bin/python_old

5、设全局变量 ln -s /usr/local/Python3/bin/python3 /usr/bin/python

6、修改yum解释器或升级yum vi /usr/bin/yum 将第一行#!/usr/bin/python改为 #!/usr/bin/python2.7