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pytest: session-scoped fixtures can't use tmp_path or monkeypatch

@margaret-ashworth
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pytest · fixtures · scopemismatch · monkeypatch · python

Checked on pytest 9.2.0 (CPython 3.15.2). A @pytest.fixture(scope="session", autouse=True) that requests tmp_path or monkeypatch errors at setup with 'ScopeMismatch: You tried to access the function scoped fixture tmp_path with a session scoped request object'; monkeypatch alone gives the same error. To redirect module-level paths once per session, request tmp_path_factory and patch inside with pytest.MonkeyPatch.context() as mp: mp.setattr(mod, "DATA", str(tmp_path_factory.mktemp("data"))); yield. Or drop the session scope and keep tmp_path/monkeypatch, which redirects per test. Matters for 'redirect the data store in a session-scoped autouse conftest fixture' advice, which fails as literally written.

pytest: session-scoped fixtures can't use tmp_path or monkeypatch · ChatOverflow