chore: remove zappy and test zarr v3

docs/release-notes/3884.chore.md

@@ -0,0 +1 @@
+Remove support for the experimental and unmaintained `zappy` library {smaller}`P Angerer`

pyproject.toml

@@ -97,8 +97,7 @@ test = [
     "scanpy[test-min]",
     # optional storage and processing modes
     "scanpy[dask]",
-    "zappy",
-    "zarr<3",
+    "zarr>=2.18.7",
     # additional tested algorithms
     "scanpy[scrublet]",
     "scanpy[leiden]",

src/scanpy/_compat.py

@@ -22,7 +22,6 @@
     "CSRBase",
     "DaskArray",
     "SpBase",
-    "ZappyArray",
     "_numba_threading_layer",
     "deprecated",
     "fullname",
@@ -58,13 +57,6 @@
     DaskArray.__module__ = "dask.array"
 
 
-if find_spec("zappy") or TYPE_CHECKING:
-    from zappy.base import ZappyArray
-else:
-    ZappyArray = type("ZappyArray", (), {})
-    ZappyArray.__module__ = "zappy.base"
-
-
 def fullname(typ: type) -> str:
     module = typ.__module__
     name = typ.__qualname__

src/scanpy/preprocessing/_distributed.py

@@ -9,8 +9,6 @@
 if TYPE_CHECKING:
     from numpy.typing import ArrayLike
 
-    from .._compat import ZappyArray
-
 
 @overload
 def materialize_as_ndarray(a: ArrayLike) -> np.ndarray: ...
@@ -33,7 +31,7 @@ def materialize_as_ndarray(
 
 
 def materialize_as_ndarray(
-    a: DaskArray | ArrayLike | tuple[ArrayLike | ZappyArray | DaskArray, ...],
+    a: DaskArray | ArrayLike | tuple[ArrayLike | DaskArray, ...],
 ) -> tuple[np.ndarray] | np.ndarray:
     """Compute distributed arrays and convert them to numpy ndarrays."""
     if isinstance(a, DaskArray):

src/testing/scanpy/_pytest/marks.py

@@ -42,7 +42,6 @@ def _generate_next_value_(
     skimage = "scikit-image"
     skmisc = "scikit-misc"
     zarr = auto()
-    zappy = auto()
     # external
     bbknn = auto()
     harmony = "harmonyTS"

tests/test_preprocessing_distributed.py

@@ -8,7 +8,7 @@
 import pytest
 from anndata import OldFormatWarning, read_zarr
 
-from scanpy._compat import DaskArray, ZappyArray
+from scanpy._compat import DaskArray
 from scanpy.preprocessing import (
     filter_cells,
     filter_genes,
@@ -25,14 +25,12 @@
 HERE = Path(__file__).parent / Path("_data/")
 input_file = Path(HERE, "10x-10k-subset.zarr")
 
-DIST_TYPES = (DaskArray, ZappyArray)
 
-
-pytestmark = [needs.zarr]
+pytestmark = [needs.zarr, needs.dask]
 
 
 @pytest.fixture
-def adata(request: pytest.FixtureRequest) -> AnnData:
+def adata() -> AnnData:
     with warnings.catch_warnings():
         warnings.filterwarnings("ignore", category=OldFormatWarning)
         warnings.filterwarnings("ignore", r"Variable names are not unique", UserWarning)
@@ -42,37 +40,25 @@ def adata(request: pytest.FixtureRequest) -> AnnData:
     return a
 
 
-@pytest.fixture(
-    params=[
-        pytest.param("direct", marks=[needs.zappy]),
-        pytest.param("dask", marks=[needs.dask]),
-    ]
-)
-def adata_dist(request: pytest.FixtureRequest) -> AnnData:
+@pytest.fixture
+def adata_dist() -> AnnData:
+    import dask.array as da
+
     # regular anndata except for X, which we replace farther down
     with warnings.catch_warnings():
         warnings.filterwarnings("ignore", category=OldFormatWarning)
         warnings.filterwarnings("ignore", r"Variable names are not unique", UserWarning)
         a = read_zarr(input_file)
     a.var_names_make_unique()
-    a.uns["dist-mode"] = request.param
     input_file_x = f"{input_file}/X"
-    if request.param == "direct":
-        import zappy.direct
-
-        a.X = zappy.direct.from_zarr(input_file_x)
-        return a
-
-    assert request.param == "dask"
-    import dask.array as da
 
     a.X = da.from_zarr(input_file_x)
     return a
 
 
 def test_log1p(adata: AnnData, adata_dist: AnnData):
     log1p(adata_dist)
-    assert isinstance(adata_dist.X, DIST_TYPES)
+    assert isinstance(adata_dist.X, DaskArray)
     result = materialize_as_ndarray(adata_dist.X)
     log1p(adata)
     assert result.shape == adata.shape
@@ -87,7 +73,7 @@ def test_normalize_per_cell(
         reason = "normalize_per_cell deprecated and broken for Dask"
         request.applymarker(pytest.mark.xfail(reason=reason))
     normalize_per_cell(adata_dist)
-    assert isinstance(adata_dist.X, DIST_TYPES)
+    assert isinstance(adata_dist.X, DaskArray)
     result = materialize_as_ndarray(adata_dist.X)
     normalize_per_cell(adata)
     assert result.shape == adata.shape
@@ -97,7 +83,7 @@ def test_normalize_per_cell(
 @pytest.mark.filterwarnings("ignore:Some cells have zero counts:UserWarning")
 def test_normalize_total(adata: AnnData, adata_dist: AnnData) -> None:
     normalize_total(adata_dist)
-    assert isinstance(adata_dist.X, DIST_TYPES)
+    assert isinstance(adata_dist.X, DaskArray)
     result = materialize_as_ndarray(adata_dist.X)
     normalize_total(adata)
     assert result.shape == adata.shape
@@ -106,8 +92,8 @@ def test_normalize_total(adata: AnnData, adata_dist: AnnData) -> None:
 
 def test_filter_cells_array(adata: AnnData, adata_dist: AnnData):
     cell_subset_dist, number_per_cell_dist = filter_cells(adata_dist.X, min_genes=3)
-    assert isinstance(cell_subset_dist, DIST_TYPES)
-    assert isinstance(number_per_cell_dist, DIST_TYPES)
+    assert isinstance(cell_subset_dist, DaskArray)
+    assert isinstance(number_per_cell_dist, DaskArray)
 
     cell_subset, number_per_cell = filter_cells(adata.X, min_genes=3)
     npt.assert_allclose(materialize_as_ndarray(cell_subset_dist), cell_subset)
@@ -116,7 +102,7 @@ def test_filter_cells_array(adata: AnnData, adata_dist: AnnData):
 
 def test_filter_cells(adata: AnnData, adata_dist: AnnData):
     filter_cells(adata_dist, min_genes=3)
-    assert isinstance(adata_dist.X, DIST_TYPES)
+    assert isinstance(adata_dist.X, DaskArray)
     result = materialize_as_ndarray(adata_dist.X)
     filter_cells(adata, min_genes=3)
 
@@ -127,8 +113,8 @@ def test_filter_cells(adata: AnnData, adata_dist: AnnData):
 
 def test_filter_genes_array(adata: AnnData, adata_dist: AnnData):
     gene_subset_dist, number_per_gene_dist = filter_genes(adata_dist.X, min_cells=2)
-    assert isinstance(gene_subset_dist, DIST_TYPES)
-    assert isinstance(number_per_gene_dist, DIST_TYPES)
+    assert isinstance(gene_subset_dist, DaskArray)
+    assert isinstance(number_per_gene_dist, DaskArray)
 
     gene_subset, number_per_gene = filter_genes(adata.X, min_cells=2)
     npt.assert_allclose(materialize_as_ndarray(gene_subset_dist), gene_subset)
@@ -137,35 +123,18 @@ def test_filter_genes_array(adata: AnnData, adata_dist: AnnData):
 
 def test_filter_genes(adata: AnnData, adata_dist: AnnData):
     filter_genes(adata_dist, min_cells=2)
-    assert isinstance(adata_dist.X, DIST_TYPES)
+    assert isinstance(adata_dist.X, DaskArray)
     result = materialize_as_ndarray(adata_dist.X)
     filter_genes(adata, min_cells=2)
     assert result.shape == adata.shape
     npt.assert_allclose(result, adata.X)
 
 
-@pytest.mark.filterwarnings("ignore::anndata.OldFormatWarning")
-def test_write_zarr(adata: AnnData, adata_dist: AnnData):
-    import zarr
-
+def test_write_zarr(adata: AnnData, adata_dist: AnnData, tmp_path: Path) -> None:
     log1p(adata_dist)
-    assert isinstance(adata_dist.X, DIST_TYPES)
-    temp_store = zarr.TempStore()
-    chunks = adata_dist.X.chunks
-    if isinstance(chunks[0], tuple):
-        chunks = (chunks[0][0],) + chunks[1]
-
-    # write metadata using regular anndata
-    adata.write_zarr(temp_store, chunks=chunks)
-    if adata_dist.uns["dist-mode"] == "dask":
-        adata_dist.X.to_zarr(temp_store.dir_path("X"), overwrite=True)
-    elif adata_dist.uns["dist-mode"] == "direct":
-        adata_dist.X.to_zarr(temp_store.dir_path("X"), chunks=chunks)
-    else:
-        pytest.fail("add branch for new dist-mode")
-
-    # read back as zarr directly and check it is the same as adata.X
-    adata_log1p = read_zarr(temp_store)
+    assert isinstance(adata_dist.X, DaskArray)
+    adata_dist.write_zarr(tmp_path / "test.zarr")
+    adata_log1p = read_zarr(tmp_path / "test.zarr")
 
     log1p(adata)
     npt.assert_allclose(adata_log1p.X, adata.X)