pip install BTrees失败

pip install BTrees失败

报错现象：

Looking in indexes: https://pypi.tuna.tsinghua.edu.cn/simple
ERROR: Could not find a version that satisfies the requirement BTrees==4.9.2 (from versions: none)
ERROR: No matching distribution found for BTrees==4.9.2

解决办法：

pip install BTrees==4.9.2 -i http://pypi.douban.com/simple/ --trusted-host pypi.douban.com