1. 搭建环境 
cmd
D:\python-code\python3-pyqt5-process-csv-data> python -m venv venv3
2. 激活 
D:\python-code\python3-pyqt5-process-csv-data> venv3\Scripts\activate
(venv3) D:\python-code\python3-pyqt5-process-csv-data>
3. 安装包