linux python 2.7 3.6,CentOS7安装python3.6保留python2.7

python3.6环境搭建

安装依赖

yum -y install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel gcc libffi-devel python-devel openssl-devel libcurl-dev libcurl-devel

获取tgz包(以3.6.4为例)

wget https://www.python.org/ftp/python/3.6.4/Python-3.6.4.tgz

解压并切换目录

tar -zxvf Python-3.6.4.tgz

cd Python-3.6.4

执行安装

./configure --prefix=/usr/local

./configure --enable-optimizations

make && make install

创建Python3的软链接

ln -s /usr/local/bin/python3 /usr/bin/python3

创建Pip3的软链接

ln -s /usr/local/bin/pip3 /usr/bin/pip3

由于CentOS7默认安装python2.7.5，有些同学想要更新成最新版本(此处以目前最新版本2.7.14为例)

python2.7.14环境搭建

获取tgz包(以2.7.14为例)

wget https://www.python.org/ftp/python/2.7.14//Python-2.7.14.tgz

解压并切换目录

tar -zxvf Python-2.7.14.tgz

cd Python-2.7.14

执行安装

./configure --prefix=/usr/local

./configure --enable-optimizations

make && make install

将老版本python更换，并更换PATH路径

mv /usr/bin/python /usr/bin/python2.7.5

export PATH="/usr/local/bin:$PATH"

创建python2.7.14软连接

ln -s /usr/local/bin/python2.7 /usr/bin/python

创建Pip2的软链接

ln -s /usr/local/bin/pip2 /usr/bin/pip2

更改yum的python依赖

注：作者把默认python的软连接改为2.7.5了，以下以2.7.5示例

cd /usr/bin

ls yum*

yum yum-builddep yum-config-manager yum-debug-dump yum-debug-restore yumdownloader yum-groups-manager

更改以上文件头为

#!/usr/bin/python 改为 #!/usr/bin/python2.7.5

此时便大功告成了！