code: def tree(grp, expand=False, level=None):
      
  
      return TreeViewer(grp, expand=expand, level=level)
docs: Provide a ``print``-able display of the hierarchy. This function is provided
      mainly as a convenience for obtaining a tree view of an h5py group - zarr groups
      have a ``.tree()`` method.
  
      Parameters
      ----------
      grp : Group
          Zarr or h5py group.
      expand : bool, optional
          Only relevant for HTML representation. If True, tree will be fully expanded.
      level : int, optional
          Maximum depth to descend into hierarchy.
  
      Examples
      --------
      >>> import zarr
      >>> g1 = zarr.group()
      >>> g2 = g1.create_group('foo')
      >>> g3 = g1.create_group('bar')
      >>> g4 = g3.create_group('baz')
      >>> g5 = g3.create_group('qux')
      >>> d1 = g5.create_dataset('baz', shape=100, chunks=10)
      >>> g1.tree()
      /
       ├── bar
       │   ├── baz
       │   └── qux
       │       └── baz (100,) float64
       └── foo
      >>> import h5py
      >>> h5f = h5py.File('data/example.h5', mode='w')
      >>> zarr.copy_all(g1, h5f)
      (5, 0, 800)
      >>> zarr.tree(h5f)
      /
       ├── bar
       │   ├── baz
       │   └── qux
       │       └── baz (100,) float64
       └── foo
  
      See Also
      --------
      zarr.hierarchy.Group.tree
  
      Notes
      -----
      Please note that this is an experimental feature. The behaviour of this
      function is still evolving and the default output and/or parameters may change
      in future versions.