pip._vendor.urllib3.exceptions.ReadTimeoutError: HTTPSConnectionPool(host='files.pythonhosted.org', port=443): Read timed out.
pip --default-timeout=100 install gevent 设置时间为100秒
pip安装时ReadTimeoutError解决办法
原文：https://www.cnblogs.com/pp8080/p/12122214.html
