In which order are pytest fixtures executed?

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The easiest way to control the order in which fixtures are executed, is to just request the previous fixture in the later fixture. So to make sure b runs before a:

@pytest.fixture(autouse=True, scope="function")
def b():
    pass

@pytest.fixture(scope="function")
def a(b):
    pass

For details on the general fixture resolution order, see Maxim’s excellent answer below or have a look at the documentation.

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