Question
When I ssh to the server for debugging, I found that it didn't work because it hadn't worked for a long time. So I just ran the code in the terminal and there was no problem. It should be a configuration problem with vscode itself.
Solution
Because the Python plug-in of vscode is updated to the latest release version by default, it is incompatible (the plug-in is automatically updated during reload, and the interpreter version lags accordingly), so it is rolled back to an available historical version.
When installing install another version, roll back to an available version.
Then
Turn off automatic updates in vscode How to turn off automatic updates