[ Python 常見問題 ] Hooks to run commands after the entire testsuite or at_exit in unittest / pytest

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Question
I need to execute a command after the entire testsuite has run or at the exit of the whole tests. I see tearDown hook in unittest but there is no after-testsuite hook or something like atexit module.

Is there any approach in unittest or pytest which I can follow; or any tweak on this?

HowTo
You can use a session-scoped fixture in pytest. As the name implies, it gives you the possibility to run code before and after the entire test session:

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1. @pytest.fixture(scope='session', autouse=True)  
2. def session_setup_teardown():  
3.     # setup code goes here if needed  
4.     yield  
5.     cleanup_testsuite()  

You best put this fixture into the top-level conftest.py.

I'm not aware of a símilar functionality in unittest - the closest is probably tearDownClass which is executed once per test class.