CentOS7保留默认python版本并安装更新python2和python3两个最新版本（python2和python3共存）

CentOS7保留默认python版本并安装更新python2和python3两个最新版本（python2和python3共存）CentOS 7 默认的python版本是python2.7.5。因为yum依赖于默认的python版本的缘由，所以要先保留默认版本，并修改yum文件头部后，才能开始安装更新python2和python3两个最新版本。（python2和python3共存） 一. 保留默认python版本2.7.5，并修改yum头部，保持yum对默认版本python2.7.5的依赖1.su root　　# 获取root权限2.mv /usr/bin/python2.7 /usr/bin/python2.7.5　　# 保留默认版本python为python2.7.5　ln -s /usr/bin/python2.7.5 /usr/local/bin/python2.7.5　　# 创建软连接3.ll /usr/bin/yum*　　# 查看/usr/bin/目录下所有yum文件（7个）头部4.vi /usr/bin/yum*　　# 修改/usr/bin/目录下所有yum文件（7个）头部　　#!/usr/bin/python —> #!/usr/bin/python2.7.5　　5.vi /usr/libexec/urlgrabber-ext-down　　# 修改/usr/libexec/目录下 urlgrabber-ext-down头部　　#!/usr/bin/python —> #!/usr/bin/python2.7.5二. 安装最新版python2.7.13和python3.6.2（python2和python3共存，修改后默认版本为python3.6.2）准备工作：1. 安装wget命令（可以在线下载安装包的命令）　　yum -y install wget2. 准备编译环境　　yum -y groupinstall 'Development Tools'　　yum -y install zlib-devel bzip2-devel openssl-devel ncurses-devel3. 下载并安装最新版本的python2和python3的tgz压缩文件　　https://www.python.org/ftp/python/2.7.13/Python-2.7.13.tgz　　https://www.python.org/ftp/python/3.6.2/Python-3.6.2.tgz 开始安装：1. 进入下载目录：　　cd /usr/local/src 2. 下载并安装最新版本python2：wget https://www.python.org/ftp/python/2.7.13/Python-2.7.13.tgztar zxvf Python-2.7.13.tgzcd Python-2.7.13./configuremake allmake installmake cleanmake distcleanrm -rf /usr/bin/pythonrm -rf /usr/bin/python2rm -rf /usr/bin/python2.7ln -s /usr/local/bin/python2.7 /usr/bin/pythonln -s /usr/local/bin/python2.7 /usr/bin/python2ln -s /usr/local/bin/python2.7 /usr/bin/python2.7/usr/bin/python -V/usr/bin/python2 -V/usr/bin/python2.7 -Vrm -rf /usr/local/bin/pythonrm -rf /usr/local/bin/python2ln -s /usr/local/bin/python2.7 /usr/local/bin/pythonln -s /usr/local/bin/python2.7 /usr/local/bin/python2python -Vpython2 -Vpython2.7 -V
3. 下载并安装最新版本python3：wget https://www.python.org/ftp/python/3.6.2/Python-3.6.2.tgztar zxvf Python-3.6.2.tgzcd Python-3.6.2./configuremake allmake install#make clean#make distcleanrm -rf /usr/bin/pythonrm -rf /usr/bin/python3rm -rf /usr/bin/python3.6ln -s /usr/local/bin/python3.6 /usr/bin/pythonln -s /usr/local/bin/python3.6 /usr/bin/python3ln -s /usr/local/bin/python3.6 /usr/bin/python3.6/usr/bin/python -V/usr/bin/python3 -V/usr/bin/python3.6 -Vrm -rf /usr/local/bin/pythonrm -rf /usr/local/bin/python3ln -s /usr/local/bin/python3.6 /usr/local/bin/pythonln -s /usr/local/bin/python3.6 /usr/local/bin/python3python -Vpython3 -Vpython3.6 -V