摘要：
pip install -r ./requirements.txt 参考： https://stackoverflow.com/questions/7225900/how-can-i-install-packages-using-pip-according-to-the-requirements-t 阅读全文
摘要：
pip -V pip 21.2.3 from /Library/Python/3.8/site-packages/pip (python 3.8) pip3 -V pip 21.2.3 from /Library/Python/3.8/site-packages/pip (python 3.8) p 阅读全文