How to use the ipyparallel.serialize.canning.istype function in ipyparallel

to avoid pickling them.
    item_threshold : int
        The maximum number of items over which canning will iterate.
        Containers (lists, dicts) larger than this will be pickled without
        introspection.

    Returns
    -------
    [bufs] : list of buffers representing the serialized object.
    """
    buffers = []
    if istype(obj, sequence_types) and len(obj) < item_threshold:
        cobj = can_sequence(obj)
        for c in cobj:
            buffers.extend(_extract_buffers(c, buffer_threshold))
    elif istype(obj, dict) and len(obj) < item_threshold:
        cobj = {}
        for k in sorted(obj):
            c = can(obj[k])
            buffers.extend(_extract_buffers(c, buffer_threshold))
            cobj[k] = c
    else:
        cobj = can(obj)
        buffers.extend(_extract_buffers(cobj, buffer_threshold))

    buffers.insert(0, pickle.dumps(cobj, PICKLE_PROTOCOL))
    return buffers

obj : object
        The object to be serialized
    buffer_threshold : int
        The threshold (in bytes) for pulling out data buffers
        to avoid pickling them.
    item_threshold : int
        The maximum number of items over which canning will iterate.
        Containers (lists, dicts) larger than this will be pickled without
        introspection.

    Returns
    -------
    [bufs] : list of buffers representing the serialized object.
    """
    buffers = []
    if istype(obj, sequence_types) and len(obj) < item_threshold:
        cobj = can_sequence(obj)
        for c in cobj:
            buffers.extend(_extract_buffers(c, buffer_threshold))
    elif istype(obj, dict) and len(obj) < item_threshold:
        cobj = {}
        for k in sorted(obj):
            c = can(obj[k])
            buffers.extend(_extract_buffers(c, buffer_threshold))
            cobj[k] = c
    else:
        cobj = can(obj)
        buffers.extend(_extract_buffers(cobj, buffer_threshold))

    buffers.insert(0, pickle.dumps(cobj, PICKLE_PROTOCOL))
    return buffers

g : globals to be used when uncanning

    Returns
    -------

    (newobj, bufs) : unpacked object, and the list of remaining unused buffers.
    """
    bufs = list(buffers)
    pobj = buffer_to_bytes_py2(bufs.pop(0))
    canned = pickle.loads(pobj)
    if istype(canned, sequence_types) and len(canned) < MAX_ITEMS:
        for c in canned:
            _restore_buffers(c, bufs)
        newobj = uncan_sequence(canned, g)
    elif istype(canned, dict) and len(canned) < MAX_ITEMS:
        newobj = {}
        for k in sorted(canned):
            c = canned[k]
            _restore_buffers(c, bufs)
            newobj[k] = uncan(c, g)
    else:
        _restore_buffers(canned, bufs)
        newobj = uncan(canned, g)

    return newobj, bufs

to avoid pickling them.
    item_threshold : int
        The maximum number of items over which canning will iterate.
        Containers (lists, dicts) larger than this will be pickled without
        introspection.

    Returns
    -------
    [bufs] : list of buffers representing the serialized object.
    """
    buffers = []
    if istype(obj, sequence_types) and len(obj) < item_threshold:
        cobj = can_sequence(obj)
        for c in cobj:
            buffers.extend(_extract_buffers(c, buffer_threshold))
    elif istype(obj, dict) and len(obj) < item_threshold:
        cobj = {}
        for k in sorted(obj):
            c = can(obj[k])
            buffers.extend(_extract_buffers(c, buffer_threshold))
            cobj[k] = c
    else:
        cobj = can(obj)
        buffers.extend(_extract_buffers(cobj, buffer_threshold))

    buffers.insert(0, pickle.dumps(cobj, PICKLE_PROTOCOL))
    return buffers

Parameters
    ----------

    bufs : list of buffers/bytes

    g : globals to be used when uncanning

    Returns
    -------

    (newobj, bufs) : unpacked object, and the list of remaining unused buffers.
    """
    bufs = list(buffers)
    pobj = buffer_to_bytes_py2(bufs.pop(0))
    canned = pickle.loads(pobj)
    if istype(canned, sequence_types) and len(canned) < MAX_ITEMS:
        for c in canned:
            _restore_buffers(c, bufs)
        newobj = uncan_sequence(canned, g)
    elif istype(canned, dict) and len(canned) < MAX_ITEMS:
        newobj = {}
        for k in sorted(canned):
            c = canned[k]
            _restore_buffers(c, bufs)
            newobj[k] = uncan(c, g)
    else:
        _restore_buffers(canned, bufs)
        newobj = uncan(canned, g)

    return newobj, bufs

obj : object
        The object to be serialized
    buffer_threshold : int
        The threshold (in bytes) for pulling out data buffers
        to avoid pickling them.
    item_threshold : int
        The maximum number of items over which canning will iterate.
        Containers (lists, dicts) larger than this will be pickled without
        introspection.

    Returns
    -------
    [bufs] : list of buffers representing the serialized object.
    """
    buffers = []
    if istype(obj, sequence_types) and len(obj) < item_threshold:
        cobj = can_sequence(obj)
        for c in cobj:
            buffers.extend(_extract_buffers(c, buffer_threshold))
    elif istype(obj, dict) and len(obj) < item_threshold:
        cobj = {}
        for k in sorted(obj):
            c = can(obj[k])
            buffers.extend(_extract_buffers(c, buffer_threshold))
            cobj[k] = c
    else:
        cobj = can(obj)
        buffers.extend(_extract_buffers(cobj, buffer_threshold))

    buffers.insert(0, pickle.dumps(cobj, PICKLE_PROTOCOL))
    return buffers

g : globals to be used when uncanning

    Returns
    -------

    (newobj, bufs) : unpacked object, and the list of remaining unused buffers.
    """
    bufs = list(buffers)
    pobj = buffer_to_bytes_py2(bufs.pop(0))
    canned = pickle.loads(pobj)
    if istype(canned, sequence_types) and len(canned) < MAX_ITEMS:
        for c in canned:
            _restore_buffers(c, bufs)
        newobj = uncan_sequence(canned, g)
    elif istype(canned, dict) and len(canned) < MAX_ITEMS:
        newobj = {}
        for k in sorted(canned):
            c = canned[k]
            _restore_buffers(c, bufs)
            newobj[k] = uncan(c, g)
    else:
        _restore_buffers(canned, bufs)
        newobj = uncan(canned, g)

    return newobj, bufs