python通过命令pip下载库提示黄色错误WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, stat

python通过命令pip下载库提示黄色错误WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by ‘ReadTimeoutError(“HTTPSConnectionPool(host=‘pypi.org’, port=443): Read timed out. (read timeout=15)”)’: /simple/xlwt/

问题：连接超时，无法下载
解决方法

pip install ddt -i http://pypi.douban.com/simple --trusted-host pypi.douban.com

其中ddt为所需下载的库，根据需求修改

转载：https://blog.csdn.net/Zn0929_Zn/article/details/107488416