virtualenv for centos installation

First, the installation steps python2.7

1. Install virtual environment: sudo pip install virtualenv
2. Install virtual environments Expansion Pack: sudo pip install virtualenvwrapper

• Python3 environment created by virtualenv

　　　　mkvirtualenv -p python3 "context name"

• .Bashrc under the home directory configuration environment variable, add the following command

　　　　export WORKON_HOME=$HOME/.virtualenvs
　　　　source /usr/local/bin/virtualenvwrapper.sh

Second, the installation steps python3.6 

1. Install virtual environment: sudo pip3 install virtualenv
2. Install virtual environments Expansion Pack: sudo pip3 install virtualenvwrapper

• Python3 environment created by virtualenv

　　　　mkvirtualenv -p python3 "context name"

• .Bashrc under the home directory configuration environment variable, add the following command

　　　　export WORKON_HOME=$HOME/.virtualenvs
　　　　source /usr/local/python3/bin/virtualenvwrapper.sh