ERROR: Could not find a version that satisfies the requirement xxxxx (from versions: none)解决办法

报错：

ERROR: Could not find a version that satisfies the requirement tensorboard==1.14.0 (from versions: none)
ERROR: No matching distribution found for tensorboard==1.14.0
WARNING: The repository located at pypi.tuna.tsinghua.edu.cn is not a trusted or secure host and is being ignored. If thi
s repository is available via HTTPS we recommend you use HTTPS instead, otherwise you may silence this warning and allow
it anyway with '--trusted-host pypi.tuna.tsinghua.edu.cn'.

---

解决方案：

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

例如：

pip install tensorboard==1.14.0 -i http://pypi.douban.com/simple/
--trusted-host pypi.douban.com

成功安装~

用下面命令查看一下也有啦~

conda list