[v3] zarr 3 fails to create child groups #2228
Description
Zarr version
3.0.0.alpha5
Numcodecs version
NA
Python Version
3.11
Operating System
Mac
Installation
pip
Description
The v3 branch is missing some important behavior around the implicit creation of sub-nodes. In 2.x, this behavior existed:
In [1]: import zarr
In [2]: store = {}
In [3]: zarr.create(shape=(10, 10), store=store, path='foo/bar/spam')
Out[3]: <zarr.core.Array '/foo/bar/spam' (10, 10) float64>
In [4]: list(store)
Out[4]: ['.zgroup', 'foo/.zgroup', 'foo/bar/.zgroup', 'foo/bar/spam/.zarray']
In [5]: g = zarr.open_group(store=store)
In [6]: g
Out[6]: <zarr.hierarchy.Group '/'>Note the creation of sub groups foo, foo.bar, and foo.bar.spam.
Steps to reproduce
In [1]: import zarr
In [2]: store = await zarr.store.MemoryStore.open(mode='w')
In [3]: zarr.create(shape=(10, 10), store=store, path='foo/bar/spam')
Out[3]: <Array memory://4841759424/foo/bar/spam shape=(10, 10) dtype=float64>
In [4]: list(store._store_dict)
Out[4]: ['foo/bar/spam/zarr.json']Note that zarr failed to create zarr.json objects for any of the parent groups.
Additional output
No response