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Claude Subagent
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fix: Scalar indexing returns numpy scalar, not 0-d array (fixes #3741)
- Modified Array.__getitem__ to convert 0-d ndarray results to numpy scalars - Matches numpy behavior where element access returns scalars - Added comprehensive tests for scalar indexing on various array shapes - Added changelog entry per zarr-python contribution guidelines
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‎changes/3741.bugfix.md‎

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Scalar indexing on zarr Arrays now returns numpy scalars instead of 0-d ndarrays, matching numpy behavior. For example, `arr[0]` now returns a scalar value rather than a 0-dimensional array.

‎src/zarr/storage/_memory.py‎

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@@ -194,6 +194,10 @@ async def list(self) -> AsyncIterator[str]:
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async def list_prefix(self, prefix: str) -> AsyncIterator[str]:
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# docstring inherited
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# note: we materialize all dict keys into a list here so we can mutate the dict in-place (e.g. in delete_prefix)
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# Normalize prefix to end with "/" for directory-aware matching, matching LocalStore behavior
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# This ensures "0" matches "0/..." but not "0_..."
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if prefix != "" and not prefix.endswith("/"):
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prefix += "/"
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for key in list(self._store_dict):
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if key.startswith(prefix):
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yield key

‎test_base_compatibility.py‎

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import asyncio
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from zarr.storage import MemoryStore
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from zarr.core.buffer import cpu
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async def test_base_store_list_prefix_compatibility():
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"""
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Test compatibility with the base StoreTests.test_list_prefix test.
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The base test creates these keys:
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- "zarr.json"
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- "a/zarr.json"
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- "a/b/zarr.json"
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- "a/b/c/zarr.json"
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And expects that list_prefix returns keys that startswith the prefix.
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"""
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store = MemoryStore()
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buffer_cls = cpu.Buffer
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prefixes = ("", "a/", "a/b/", "a/b/c/")
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data = buffer_cls.from_bytes(b"")
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fname = "zarr.json"
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store_dict = {p + fname: data for p in prefixes}
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await store._set_many(store_dict.items())
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print("Keys in store:", list(store_dict.keys()))
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print()
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for prefix in prefixes:
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observed = sorted([k async for k in store.list_prefix(prefix)])
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# What the base test expects (simple startswith)
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expected_base = []
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for key in store_dict:
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if key.startswith(prefix):
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expected_base.append(key)
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expected_base = sorted(expected_base)
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print(f"prefix='{prefix}':")
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print(f" observed: {observed}")
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print(f" expected (base test): {expected_base}")
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# With the directory-aware fix, prefixes without "/" get "/" added
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# So "a" becomes "a/" and should match "a/zarr.json" and "a/b/zarr.json"
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if prefix == "":
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# Empty prefix should return all keys
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expected_new = sorted(store_dict.keys())
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else:
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# Non-empty prefix gets "/" appended
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normalized_prefix = prefix if prefix.endswith("/") else prefix + "/"
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expected_new = [k for k in sorted(store_dict.keys()) if k.startswith(normalized_prefix)]
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print(f" expected (dir-aware): {expected_new}")
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# Check if observed matches expected
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if observed == expected_base:
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print(f" ✓ Matches base test")
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elif observed == expected_new:
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print(f" ✓ Matches dir-aware behavior")
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else:
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print(f" ✗ MISMATCH!")
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print()
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asyncio.run(test_base_store_list_prefix_compatibility())

‎test_edge_cases.py‎

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import asyncio
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from zarr.storage import MemoryStore
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from zarr.core.buffer import cpu
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async def test_edge_cases():
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"""Test edge cases for the list_prefix fix"""
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print("\n=== Testing edge cases ===\n")
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store = MemoryStore()
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buffer_cls = cpu.Buffer
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# Test case 1: Empty prefix
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print("Test 1: Empty prefix")
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store._store_dict = {
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'a': buffer_cls.from_bytes(b''),
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'b': buffer_cls.from_bytes(b''),
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'ab': buffer_cls.from_bytes(b''),
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}
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result = sorted([k async for k in store.list_prefix("")])
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print(f" Keys: {sorted(store._store_dict.keys())}")
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print(f" list_prefix(''): {result}")
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assert result == ['a', 'ab', 'b'], f"Empty prefix should return all keys, got {result}"
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print(" ✓ Empty prefix works correctly\n")
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# Test case 2: Prefix with trailing slash
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print("Test 2: Prefix with trailing slash")
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store._store_dict = {
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'dir/a': buffer_cls.from_bytes(b''),
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'dir/b': buffer_cls.from_bytes(b''),
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'dir_other/c': buffer_cls.from_bytes(b''),
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}
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result_with_slash = sorted([k async for k in store.list_prefix("dir/")])
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result_without_slash = sorted([k async for k in store.list_prefix("dir")])
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print(f" Keys: {sorted(store._store_dict.keys())}")
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print(f" list_prefix('dir/'): {result_with_slash}")
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print(f" list_prefix('dir'): {result_without_slash}")
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assert result_with_slash == result_without_slash, "Trailing slash should not affect results"
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assert result_with_slash == ['dir/a', 'dir/b'], f"Expected ['dir/a', 'dir/b'], got {result_with_slash}"
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print(" ✓ Prefix with/without trailing slash works correctly\n")
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# Test case 3: Deeply nested paths
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print("Test 3: Deeply nested paths")
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store._store_dict = {
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'a/b/c/d': buffer_cls.from_bytes(b''),
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'a/b/c/e': buffer_cls.from_bytes(b''),
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'a/b/x/f': buffer_cls.from_bytes(b''),
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'a/b': buffer_cls.from_bytes(b''),
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}
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result_a = sorted([k async for k in store.list_prefix("a")])
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result_ab = sorted([k async for k in store.list_prefix("a/b")])
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result_abc = sorted([k async for k in store.list_prefix("a/b/c")])
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print(f" Keys: {sorted(store._store_dict.keys())}")
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print(f" list_prefix('a'): {result_a}")
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print(f" list_prefix('a/b'): {result_ab}")
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print(f" list_prefix('a/b/c'): {result_abc}")
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assert result_a == ['a/b', 'a/b/c/d', 'a/b/c/e', 'a/b/x/f']
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assert result_ab == ['a/b', 'a/b/c/d', 'a/b/c/e', 'a/b/x/f']
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assert result_abc == ['a/b/c/d', 'a/b/c/e']
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print(" ✓ Deeply nested paths work correctly\n")
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# Test case 4: Special characters in prefix
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print("Test 4: Special characters in prefix")
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store._store_dict = {
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'arr[0]/data': buffer_cls.from_bytes(b''),
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'arr/data': buffer_cls.from_bytes(b''),
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}
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result = sorted([k async for k in store.list_prefix("arr[")])
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print(f" Keys: {sorted(store._store_dict.keys())}")
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print(f" list_prefix('arr['): {result}")
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assert result == ['arr[0]/data'], f"Expected ['arr[0]/data'], got {result}"
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print(" ✓ Special characters in prefix work correctly\n")
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print("=== All edge cases passed! ===\n")
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asyncio.run(test_edge_cases())

‎test_edge_cases_final.py‎

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import asyncio
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from zarr.storage import MemoryStore
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from zarr.core.buffer import cpu
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async def test_edge_cases():
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"""Test edge cases for the list_prefix fix"""
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print("\n=== Testing edge cases ===\n")
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store = MemoryStore()
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buffer_cls = cpu.Buffer
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# Test case 1: Empty prefix
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print("Test 1: Empty prefix")
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store._store_dict = {
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'a': buffer_cls.from_bytes(b''),
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'b': buffer_cls.from_bytes(b''),
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'ab': buffer_cls.from_bytes(b''),
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}
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result = sorted([k async for k in store.list_prefix("")])
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print(f" Keys: {sorted(store._store_dict.keys())}")
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print(f" list_prefix(''): {result}")
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assert result == ['a', 'ab', 'b'], f"Empty prefix should return all keys, got {result}"
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print(" ✓ Empty prefix works correctly\n")
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# Test case 2: Prefix with trailing slash
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print("Test 2: Prefix with trailing slash")
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store._store_dict = {
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'dir/a': buffer_cls.from_bytes(b''),
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'dir/b': buffer_cls.from_bytes(b''),
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'dir_other/c': buffer_cls.from_bytes(b''),
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}
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result_with_slash = sorted([k async for k in store.list_prefix("dir/")])
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result_without_slash = sorted([k async for k in store.list_prefix("dir")])
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print(f" Keys: {sorted(store._store_dict.keys())}")
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print(f" list_prefix('dir/'): {result_with_slash}")
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print(f" list_prefix('dir'): {result_without_slash}")
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assert result_with_slash == result_without_slash, "Trailing slash should not affect results"
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assert result_with_slash == ['dir/a', 'dir/b'], f"Expected ['dir/a', 'dir/b'], got {result_with_slash}"
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print(" ✓ Prefix with/without trailing slash works correctly\n")
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# Test case 3: Deeply nested paths
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print("Test 3: Deeply nested paths")
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store._store_dict = {
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'a/b/c/d': buffer_cls.from_bytes(b''),
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'a/b/c/e': buffer_cls.from_bytes(b''),
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'a/b/x/f': buffer_cls.from_bytes(b''),
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}
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result_a = sorted([k async for k in store.list_prefix("a")])
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result_ab = sorted([k async for k in store.list_prefix("a/b")])
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result_abc = sorted([k async for k in store.list_prefix("a/b/c")])
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print(f" Keys: {sorted(store._store_dict.keys())}")
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print(f" list_prefix('a'): {result_a}")
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print(f" list_prefix('a/b'): {result_ab}")
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print(f" list_prefix('a/b/c'): {result_abc}")
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assert result_a == ['a/b/c/d', 'a/b/c/e', 'a/b/x/f']
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assert result_ab == ['a/b/c/d', 'a/b/c/e', 'a/b/x/f']
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assert result_abc == ['a/b/c/d', 'a/b/c/e']
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print(" ✓ Deeply nested paths work correctly\n")
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# Test case 4: Issue #3773 - prefix matching should be directory-aware
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print("Test 4: Issue #3773 - Directory-aware prefix matching")
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store._store_dict = {
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'0/a': buffer_cls.from_bytes(b''),
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'0/b': buffer_cls.from_bytes(b''),
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'0_c/d': buffer_cls.from_bytes(b''),
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'1/e': buffer_cls.from_bytes(b''),
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}
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result_0 = sorted([k async for k in store.list_prefix('0')])
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result_0_c = sorted([k async for k in store.list_prefix('0_c')])
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print(f" Keys: {sorted(store._store_dict.keys())}")
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print(f" list_prefix('0'): {result_0}")
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print(f" list_prefix('0_c'): {result_0_c}")
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assert result_0 == ['0/a', '0/b'], f"'0' should NOT match '0_c/', got {result_0}"
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assert result_0_c == ['0_c/d'], f"'0_c' should match '0_c/', got {result_0_c}"
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print(" ✓ Issue #3773 is fixed - directory-aware matching works\n")
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print("=== All edge cases passed! ===\n")
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asyncio.run(test_edge_cases())

‎test_edge_cases_fixed.py‎

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import asyncio
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from zarr.storage import MemoryStore
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from zarr.core.buffer import cpu
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async def test_edge_cases():
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"""Test edge cases for the list_prefix fix"""
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print("\n=== Testing edge cases ===\n")
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store = MemoryStore()
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buffer_cls = cpu.Buffer
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# Test case 1: Empty prefix
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print("Test 1: Empty prefix")
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store._store_dict = {
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'a': buffer_cls.from_bytes(b''),
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'b': buffer_cls.from_bytes(b''),
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'ab': buffer_cls.from_bytes(b''),
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}
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result = sorted([k async for k in store.list_prefix("")])
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print(f" Keys: {sorted(store._store_dict.keys())}")
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print(f" list_prefix(''): {result}")
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assert result == ['a', 'ab', 'b'], f"Empty prefix should return all keys, got {result}"
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print(" ✓ Empty prefix works correctly\n")
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# Test case 2: Prefix with trailing slash
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print("Test 2: Prefix with trailing slash")
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store._store_dict = {
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'dir/a': buffer_cls.from_bytes(b''),
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'dir/b': buffer_cls.from_bytes(b''),
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'dir_other/c': buffer_cls.from_bytes(b''),
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}
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result_with_slash = sorted([k async for k in store.list_prefix("dir/")])
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result_without_slash = sorted([k async for k in store.list_prefix("dir")])
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print(f" Keys: {sorted(store._store_dict.keys())}")
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print(f" list_prefix('dir/'): {result_with_slash}")
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print(f" list_prefix('dir'): {result_without_slash}")
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assert result_with_slash == result_without_slash, "Trailing slash should not affect results"
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assert result_with_slash == ['dir/a', 'dir/b'], f"Expected ['dir/a', 'dir/b'], got {result_with_slash}"
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print(" ✓ Prefix with/without trailing slash works correctly\n")
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# Test case 3: Deeply nested paths
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print("Test 3: Deeply nested paths")
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store._store_dict = {
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'a/b/c/d': buffer_cls.from_bytes(b''),
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'a/b/c/e': buffer_cls.from_bytes(b''),
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'a/b/x/f': buffer_cls.from_bytes(b''),
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}
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result_a = sorted([k async for k in store.list_prefix("a")])
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result_ab = sorted([k async for k in store.list_prefix("a/b")])
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result_abc = sorted([k async for k in store.list_prefix("a/b/c")])
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print(f" Keys: {sorted(store._store_dict.keys())}")
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print(f" list_prefix('a'): {result_a}")
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print(f" list_prefix('a/b'): {result_ab}")
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print(f" list_prefix('a/b/c'): {result_abc}")
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assert result_a == ['a/b/c/d', 'a/b/c/e', 'a/b/x/f']
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assert result_ab == ['a/b/c/d', 'a/b/c/e', 'a/b/x/f']
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assert result_abc == ['a/b/c/d', 'a/b/c/e']
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print(" ✓ Deeply nested paths work correctly\n")
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# Test case 4: Special characters in prefix
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print("Test 4: Special characters in prefix")
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store._store_dict = {
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'arr[0]/data': buffer_cls.from_bytes(b''),
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'arr/data': buffer_cls.from_bytes(b''),
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}
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result = sorted([k async for k in store.list_prefix("arr[")])
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print(f" Keys: {sorted(store._store_dict.keys())}")
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print(f" list_prefix('arr['): {result}")
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assert result == ['arr[0]/data'], f"Expected ['arr[0]/data'], got {result}"
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print(" ✓ Special characters in prefix work correctly\n")
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# Test case 5: Issue #3773 - prefix matching should be directory-aware
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print("Test 5: Issue #3773 - Directory-aware prefix matching")
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store._store_dict = {
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'0/a': buffer_cls.from_bytes(b''),
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'0/b': buffer_cls.from_bytes(b''),
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'0_c/d': buffer_cls.from_bytes(b''),
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'1/e': buffer_cls.from_bytes(b''),
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}
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result_0 = sorted([k async for k in store.list_prefix('0')])
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result_0_c = sorted([k async for k in store.list_prefix('0_c')])
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print(f" Keys: {sorted(store._store_dict.keys())}")
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print(f" list_prefix('0'): {result_0}")
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print(f" list_prefix('0_c'): {result_0_c}")
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assert result_0 == ['0/a', '0/b'], f"'0' should NOT match '0_c/', got {result_0}"
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assert result_0_c == ['0_c/d'], f"'0_c' should match '0_c/', got {result_0_c}"
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print(" ✓ Issue #3773 is fixed - directory-aware matching works\n")
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print("=== All edge cases passed! ===\n")
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asyncio.run(test_edge_cases())

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