import zarr
zarr.__version__

'2.3.3.dev87'

g1 = zarr.group()
g2 = g1.create_group('foo')
g3 = g1.create_group('bar')
g3.create_group('baz')
g3.create_dataset('xxx', shape=100)
g3.create_dataset('yyy', shape=(100, 100), dtype='i4')
g5 = g3.create_group('quux')
g5.create_dataset('aaa', shape=100)
g5.create_dataset('bbb', shape=(100, 100), dtype='i4')
g7 = g3.create_group('zoo')

Generate text (unicode) tree:

print(g1.tree())

/
 ├── bar
 │   ├── baz
 │   ├── quux
 │   │   ├── aaa (100,) float64
 │   │   └── bbb (100, 100) int32
 │   ├── xxx (100,) float64
 │   ├── yyy (100, 100) int32
 │   └── zoo
 └── foo

The level parameter controls how deep the tree is.

print(g1.tree(level=1))

/
 ├── bar
 └── foo

print(g1.tree(level=2))

/
 ├── bar
 │   ├── baz
 │   ├── quux
 │   ├── xxx (100,) float64
 │   ├── yyy (100, 100) int32
 │   └── zoo
 └── foo

Alternative plain ASCII tree:

print(bytes(g1.tree()).decode())

/
 +-- bar
 |   +-- baz
 |   +-- quux
 |   |   +-- aaa (100,) float64
 |   |   +-- bbb (100, 100) int32
 |   +-- xxx (100,) float64
 |   +-- yyy (100, 100) int32
 |   +-- zoo
 +-- foo

HTML trees:

g1.tree()

Use expand=True to have all groups automatically expanded.

g1.tree(expand=True)

g1.tree(expand=True, level=2)

g1.tree(expand=True, level=1)

The expand parameter can also be an integer, giving the depth to expand to.

g1.tree(expand=1)

g1.tree(expand=2)

g1.tree(expand=3)