centos服务器同时存在python2和python3

1. 安装依赖包

   yum install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gcc* make -y

2. 下载python安装包

   wget https://www.python.org/ftp/python/3.5.2/Python-3.5.2.tar.xz

3. 解压python安装包

   tar -Jxvf Python-3.5.2.tar.xz

4. 配置安装路径

   切入到解压目录下

   ./configure prefix=/usr/local/python3

5. 编译安装

   切入到解压目录下

   make && make install

6. 配置软连接

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

   ln -s /usr/local/python3/bin/pip3 /usr/bin/pip3

　　注：如果提示如：ln: failed to create symbolic link ‘/usr/bin/pip3’: File exists

则说这个文件已存在，但是删除之后，依然是提示这个，则强制覆盖即可：

ln -sf /usr/local/python3/bin/python3 /usr/bin/python3

ln -sf /usr/local/python3/bin/pip3 /usr/bin/pip3

参考来源：https://www.cnblogs.com/vinic-xxm/p/11358894.html