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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def read_zarr(store):
 """Read from a hierarchical Zarr array store. Parameters store The filename, a :class:`~typing.MutableMapping`, or a Zarr storage class. """

    if isinstance(store, Path):
        store = str(store)
    import zarr
    f = zarr.open(store, mode='r')
    d = {}
    for key in f.keys():
        _read_key_value_from_zarr(f, d, key)
    return AnnData(*AnnData._args_from_dict(d))