CentOS7下安装Python3及Pip3并保留Python2

环境：CentOS 7
1. 安装依赖环境# 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

2. 浏览器打开 https://www.python.org/ftp/python/ 查看最新的Python版本，标记为3.A.B# wget https://www.python.org/ftp/python/3.A.B/Python-3.A.B.tgz
3. 创建Python3的目录# mkdir /usr/local/python3 
4. 解压下载文件并切换目录# tar -zxvf Python-3.A.B.tgz# cd Python-3.A.B

5. 执行# ./configure --prefix=/usr/local/python3
# make && make install
6. 创建Python3的软链接# ln -s /usr/local/python3/bin/python3 /usr/bin/python3

7. 创建Pip3的软链接# ln -s /usr/local/python3/bin/pip3 /usr/bin/pip3
8. 测试命令 python3 和 pip3# python3# pip3
安装保留了原python命令调用python2安装完成