python command to create a virtual environment

windows down

1, install the virtual environment
pip install virtualenv

2, creating a virtual environment (If you have multiple versions of python, you need to specify python interpreter)
virtualenv 虚拟环境名 -p python路径

3, activation virtual environment (into the Script folder under virtual environment directory, find activate.bat)
输入：activate.bat

4, Exit virtual environment
输入:activate.bat

Or under Linux mac

1, install the virtual environment
sudo pip install virtualenv
NOTE: Linux is not installed by default pip, pip need to manually install command.

sudo apt install python-pip    #python2.7安装
sudo apt install python3-pip   # python3安装 
pip install --upgrade pip      #pip 更新

2, create a virtual environment

# 在项目的根目录(建议),也可以在其他地方均可
cd /home/www/django

# 创建虚拟环境,名字随意
virtualenv venv

3, activation virtual environment
source .venv/bin/activate

4, exit the virtual environment
deactivate