centos7，python2和python3共存

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

7. 导出之前python安装的包的清单

   pip freeze > requirements.txt

8. 安装清单

   Pip install -r requirements.txt