raise ReadTimeoutError(self._pool, None, ‘Read timed out.’) ReadTimeoutError: HTTPSConnectionPool(host=‘files.pythonhosted.org’, port=443): Read timed out.
#安装虚拟环境出现报错：sudo pip install virtualenv解决办法：
pip install numpy -i https://pypi.tuna.tsinghua.edu.cn/simple/