Linux使用豆瓣源下载scipy报错“Cannot unpack file “

输入语句：

pip install -i http://pypi.douban.com/simple/ scipy==1.2.0

报错如下：

Cannot unpack file /tmp/pip-unpack-img8xnm_/simple.htm (downloaded from /tmp/pip-req-build-no42ay7g, content-type: text/html); cannot detect archive format
Cannot determine archive format of /tmp/pip-req-build-no42ay7g

解决方法为改输入：

pip install scipy==1.2.0 -i https://pypi.douban.com/simple --trust -host=pypi.douban.com