no zarr2 + make zarr3 a public module

Author: normanrz

.github/workflows/ci.yaml

@@ -15,7 +15,6 @@ jobs:
         python-version: ["3.10", "3.11", "3.12", "3.13.0"]
         # macos-12 is an intel runner, macos-14 is a arm64 runner
         platform: [ubuntu-latest, windows-latest, macos-12, macos-14]
-        zarr-version: ["zarr>=2,<3", "zarr==3.0.0b0"]
 
     steps:
       - name: Checkout source
@@ -77,7 +76,7 @@ jobs:
         shell: "bash -l {0}"
         run: |
           conda activate env
-          python -m pip install '${{ matrix.zarr-version }}'
+          python -m pip install 'zarr==3.0.0b0'
 
       # This is used to test with zfpy, which does not yet support numpy 2.0
       - name: Install older numpy and zfpy

numcodecs/tests/test_zarr3.py

@@ -1,13 +1,10 @@
 from __future__ import annotations
-from collections.abc import Iterator
-
 
 import numpy as np
 import pytest
 
 from numcodecs.registry import get_codec
 
-
 zarr = pytest.importorskip("zarr", minversion="3.0.0")
 
 get_codec_class = zarr.codecs.registry.get_codec_class
@@ -23,8 +20,8 @@
 
 
 @pytest.fixture
-def store() -> Iterator[Store]:
-    yield StorePath(MemoryStore(mode="w"))
+def store() -> Store:
+    return StorePath(MemoryStore(mode="w"))
 
 
 @pytest.mark.parametrize(

numcodecs/tests/test_zarr3_import.py

@@ -7,11 +7,7 @@ def test_zarr3_import():
     ERROR_MESSAGE_MATCH = "zarr 3.0.0 or later.*"
 
     try:
-        import zarr
-
-        if zarr.__version__ < "3.0.0":
-            with pytest.raises(ImportError, match=ERROR_MESSAGE_MATCH):
-                import numcodecs._zarr3  # noqa: F401
+        import zarr  # noqa: F401
     except ImportError:
         with pytest.raises(ImportError, match=ERROR_MESSAGE_MATCH):
-            import numcodecs._zarr3  # noqa: F401
+            import numcodecs.zarr3  # noqa: F401