What's the difference between “virtualenv” and “-m venv” in creating Virtual environments(Python)
venv is a package shipped directly with python 3 (No for python 2). So you don't need to pip install anything. 参考 Virtual Environments and Packages
virtualenv instead is an independent library available at https://virtualenv.pypa.io/en/stable/ and can be install with pip. 参考 Python开发必备神器之一：virtualenv 廖雪峰网站 Virtualenv in IPython Jupyter Notebook
virtualenvwrapper: 参考 Python开发必备神器之一：virtualenv 安装 on pypi