创建虚拟环境并安装django的时候一直不成功，总是超时报错唉：pip._vendor.urllib3.exceptions.ReadTimeoutError: HTTPSConnectionPool(host='files.pythonhosted.org', port=443): Read timed out.
创建虚拟环境并安装django的时候一直不成功，总是超时报错唉：pip._vendor.urllib3.exceptions.ReadTimeoutError: HTTPSConnectionPool(host='files.pythonhosted.org', port=443): Read timed out.