pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available

Could not fetch URL https://mirrors.aliyun.com/pypi/simple/pip/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='mirrors.aliyun.com', port=443): Max retries exceeded with url: /pypi/simple/pip/ (Caused by SSLError("Can't connect to HTTPS URL because the SSL module is not available.",)) - skipping

pip3 install -U pip

解决方案：

linux pip3修改源 ： 连接