How to use the dill._dill.Pickler function in dill

def dump_session(filename='/tmp/session.pkl', main=None, byref=False, **kwds):
    """pickle the current state of __main__ to a file"""
    from .settings import settings
    protocol = settings['protocol']
    if main is None: main = _main_module
    if hasattr(filename, 'write'):
        f = filename
    else:
        f = open(filename, 'wb')
    try:
        if byref:
            main = _stash_modules(main)
        pickler = Pickler(f, protocol, **kwds)
        pickler._main = main     #FIXME: dill.settings are disabled
        pickler._byref = False   # disable pickling by name reference
        pickler._recurse = False # disable pickling recursion for globals
        pickler._session = True  # is best indicator of when pickling a session
        pickler.dump(main)
    finally:
        if f is not filename:  # If newly opened file
            f.close()
    return

def is_dill(pickler, child=None):
    "check the dill-ness of your pickler"
    if (child is False) or PY34 or (not hasattr(pickler.__class__, 'mro')):
        return 'dill' in pickler.__module__
    return Pickler in pickler.__class__.mro()

def dump(obj, file, protocol=None, byref=None, fmode=None, recurse=None, **kwds):#, strictio=None):
    """pickle an object to a file"""
    from .settings import settings
    protocol = settings['protocol'] if protocol is None else int(protocol)
    _kwds = kwds.copy()
    _kwds.update(dict(byref=byref, fmode=fmode, recurse=recurse))
    Pickler(file, protocol, **_kwds).dump(obj)
    return

def __init__(self, *args, **kwds):
        settings = Pickler.settings
        _ignore = kwds.pop('ignore', None)
        StockUnpickler.__init__(self, *args, **kwds)
        self._main = _main_module
        self._ignore = settings['ignore'] if _ignore is None else _ignore

def _extend():
    """extend pickle with all of dill's registered types"""
    # need to have pickle not choke on _main_module?  use is_dill(pickler)
    for t,func in Pickler.dispatch.items():
        try:
            StockPickler.dispatch[t] = func
        except: #TypeError, PicklingError, UnpicklingError
            log.info("skip: %s" % t)
        else: pass
    return