cmd下输入：前提是你的python安装路径已经被添加到环境变量中
C:\>pip install virtualenv

C:\>virtualenv testenv
Using base prefix 'c:\\python36'
New python executable in C:\testenv\Scripts\python.exe //默认安装在当前目录下
Installing setuptools, pip, wheel...done.

C:\testenv\Scripts>activate   //激活
 
(testenv) C:\testenv\Scripts>  //注意终端发生了变化
(testenv) C:\testenv\Scripts>deactivate   //关闭当前虚拟环境
C:\testenv\Scripts>

(testenv) c:\testenv\Scripts>pip3 list
pip (9.0.1)
setuptools (37.0.0)
wheel (0.30.0)

c:\>pip install virtualenvwrapper-win //安装
c:\>mkvirtualenv testenv2 //创建虚拟环境
 C:\Users\liubin\Envs is not a directory, creating
Using base prefix 'c:\\python36'
New python executable in C:\Users\liubin\Envs\testenv2\Scripts\python.exe //virtualenvwrapper默认会把虚拟环境放在一个目录下
Installing setuptools, pip, wheel...done.
(testenv3) c:\Users\liubin\Envs\testenv2\Scripts>workon //查看当前有哪些虚拟环境
 
Pass a name to activate one of the following virtualenvs:
==============================================================================
testenv2
testenv3
(testenv3) c:\Users\liubin\Envs\testenv2\Scripts>workon testenv2 //workon也可以用来切换虚拟环境
(testenv2) c:\Users\liubin\Envs\testenv2\Scripts>