[Python] Grouping tests in pytest: Classes vs plain functions

I'm using pytest to test my app. pytest supports 2 approaches (that I'm aware of) of how to write tests:

1. In classes:

test_feature.py -> class TestFeature -> def test_feature_sanity
​

1. In functions:

test_feature.py -> def test_feature_sanity
​

Is the approach of grouping tests in a class needed? Is it allowed to backport unittest builtin module? Which approach would you say is better and why?

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