Two ways to create a virtual Python environment under Windows:

　　In the actual project development, we will be according to their needs to download a variety of appropriate framework library, but each project may use the library is not the same, or not the same version and so on and so on. In order to avoid these factors cause some unwanted impact on our project, we may need to switch back and forth or loading and unloading can be resolved. But after using a virtual environment, you use a separate project environment, all the things that are required by the project itself, each environment are independent and can be performed simultaneously.

1、 anaconda 

　　https://www.cnblogs.com/mini-test/p/11937211.html

2 virtualenv

　　https://www.cnblogs.com/mini-test/p/11904337.html