安装python3：
yum -y groupinstall "Development tools"
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
wget https://www.python.org/ftp/python/3.6.2/Python-3.6.2.tar.xz
mkdir /usr/local/python3
tar -xvJf Python-3.6.2.tar.xz
cd Python-3.6.2
./configure --prefix=/usr/local/python3
make && make install
yum -y install python-pip
ln -s /usr/local/python3/bin/python3 /usr/bin/python3
ln -s /usr/local/python3/bin/pip3 /usr/bin/pip3
配置python虚拟环境（创建多个python环境，各个python环境之间完全隔离，互不影响）：
pip3 install virtualenv
pip3 install virtualenvwrapper
vim ~/.bashrc #添加以下内容：
VIRTUALENVWRAPPER_PYTHON=/usr/local/python3/bin/python3
# 指定virtualenvwrapper执行的python版本
export WORKON_HOME=$HOME/.virtualenvs
# 指定虚拟环境存放目录，.virtualenvs目录名可自拟
source /usr/local/bin/virtualenvwrapper.sh
# virtualenvwrapper.sh所在目录
source ~/.bashrc
mkvirtualenv --python=/usr/bin/python3 py3-env #新建虚拟环境
workon my_env #进入虚拟环境
deactivate #退出虚拟环境
rmvirtualenv my_env #删除某个虚拟环境
lsvirtualenv #列出所有虚拟环境
cdvirtualenv #进入到虚拟环境所在的目录
