pip安装resquests出错:ERROR: Could not find a version that satisfies the requirement requests (from v解决方法

在我电脑上使用pip安装pip install resquests出现报错：
ERROR: Could not find a version that satisfies the requirement requests (from versions: none)
ERROR: No matching distribution found for requests

解决的方法为：
pip install requests -i http://pypi.douban.com/simple/ --trusted-host pypi.douban.com