pip freeze > requirements.txt
pip install -r requirement.txt
注：离线安装需要提前下载所需的*.whl文件(https://pipy.org)
pip install --find-links=. /package -r ./package/requirement.txt
python——pip导出导入安装包
原文：https://www.cnblogs.com/boye169/p/13961849.html
