1，安装依赖环境
yum -y install gcc gcc-c++ kernel-devel
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
出现超级长的输出：
2，下载Python3
wget https://www.python.org/ftp/python/3.6.1/Python-3.6.1.tgz
3，安装python3
安装在/usr/local/python3（具体安装位置看个人喜好）
mkdir -p /usr/local/python3
4，解压下载好的Python-3.x.x.tgz包
tar -zxvf Python-3.6.1.tgz
5，进入解压后的目录，编译安装。
cd Python-3.6.1
./configure --prefix=/usr/local/python3
make && make install
6， 建立python3的软链
ln -s /usr/local/python3/bin/python3 /usr/bin/python3
7，将/usr/local/python3/bin加入PATH
vim ~/.bash_profile
改之前：
改之后：
修改完记得执行行下面的命令，让上一步的修改生效：
source ~/.bash_profile
检验：
python3 -V
OK！
不过，python离不开pip:
解决Linux pip安装包。解决：You should consider upgrading via the 'pip install --upgrade pip' command.
几个常用地pip3安装包：
pip3 install requests
pip3 install re
pip3 install bs4
pip3 install json
pip3 install lxml
