PS C:\Users\Administrator\Desktop> pip install requestERROR: Could not find a version that satisfies the requirement request (from versions: none)ERROR: No matching distribution found for request
出现这种报错有以下几种可能性：
1.pip版本过低，需要更新
python -m pip install --upgrade pip
2.代理服务器处于打开状态，需要关闭
3.换源。我刚开始用清华源，失败，改用豆瓣源，OK。
pip install requests -i http://pypi.douban.com/simple/ --trusted-host pypi.douban.com
具体做法是 pip install 你需要的包的名字 -i http://pypi.douban.com/simple/ --trusted-host pypi.douban.com
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