[Python] How to mark one function not a test for pytest?

I'm using pytest to test some code based on TensorFlow.

A TestCase is defined for simplicity like:

class TestCase(tf.test.TestCase):
# ...


The problem is tf.test.TestCase provide a useful function self.test_session(), which was treated as a test method in pytest since its name starts with test_.

The result pytest report more succeed tests than test methods I defined due to test_session() methods.

I use the following code to skip test_session:

class TestCase(tf.test.TestCase):
@pytest.mark.skip
@contextmanager
def test_session(self):
with super().test_session() as sess:
yield sess


However there would be some "s" in test report indicating there are some skip tests.

Is there anyway I can mark one exact method not a test method without changing pytest test discovery rules globally?

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