How to use the hickle.hickle.PyContainer function in hickle

Recursive funnction to load hdf5 data into a PyContainer()

    Args:
        py_container (PyContainer): Python container to load data into
        h_group (h5 group or dataset): h5py object, group or dataset, to spider
                and load all datasets.
    """

    group_dtype   = h5._hl.group.Group
    dataset_dtype = h5._hl.dataset.Dataset

    #either a file, group, or dataset
    if isinstance(h_group, (H5FileWrapper, group_dtype)):

        py_subcontainer = PyContainer()
        try:
            py_subcontainer.container_type = bytes(h_group.attrs['type'][0])
        except KeyError:
            raise
            #py_subcontainer.container_type = ''
        py_subcontainer.name = h_group.name

        if py_subcontainer.container_type == b'dict_item':
            py_subcontainer.key_type = h_group.attrs['key_type']

        if py_subcontainer.container_type not in types_not_to_sort:
            h_keys = sort_keys(h_group.keys())
        else:
            h_keys = h_group.keys()

        for h_name in h_keys:

raise RuntimeError("Cannot open file. This file was likely"
                                       " created with Python 2 and an old hickle version.")
            # There is an unfortunate period of time where hickle 2.1.0 claims VERSION = int(3)
            # For backward compatibility we really need to catch this.
            # Actual hickle v3 files are versioned as A.B.C (e.g. 3.1.0)
            elif VER_MAJOR == 3 and VER == VER_MAJOR:
                if PY2:
                    warnings.warn("Hickle file appears to be old version (v2.1.0), attempting "
                                  "legacy loading...")
                    from . import hickle_legacy2
                    return hickle_legacy2.load(fileobj, path=path, safe=safe)
                else:
                    raise RuntimeError("Cannot open file. This file was likely"
                                       " created with Python 2 and an old hickle version.")
            elif VER_MAJOR >= 3:
                py_container = PyContainer()
                py_container.container_type = 'hickle'
                py_container = _load(py_container, h_root_group)
                return py_container[0][0]

        except AssertionError:
            if PY2:
                warnings.warn("Hickle file is not versioned, attempting legacy loading...")
                from . import hickle_legacy
                return hickle_legacy.load(fileobj, safe)
            else:
                raise RuntimeError("Cannot open file. This file was likely"
                                   " created with Python 2 and an old hickle version.")
    finally:
        # Close the file if requested.
        # Closing a file twice will not cause any problems
        if close_flag:

def __init__(self):
        super(PyContainer, self).__init__()
        self.container_type = None
        self.name = None
        self.key_type = None