How to use the numcodecs.Pickle function in numcodecs

from __future__ import absolute_import, division, print_function

from collections import Iterable

import numpy as np

import zarr
from zarr.attrs import Attributes
from zarr.storage import init_group, contains_group
import numcodecs
zarr.codecs.codec_registry[numcodecs.Pickle.codec_id] = numcodecs.Pickle
zarr.codecs.codec_registry[numcodecs.MsgPack.codec_id] = numcodecs.MsgPack

from progressivis.core.config import get_option
from .base import StorageEngine, Group, Attribute, Dataset


# For now (April 21st 2017), zarr misses two important features: fancy indexing and Boolean indexing.
# These two features are scheduled for inclusion in future releases of zarr.


Group.register(zarr.Group)
Attribute.register(Attributes)
Dataset.register(zarr.Array)

class ZARRGroup(zarr.Group):
    def __init__(self, store, **kwds):