human
Solve the following python programming problem given the following code:
@inlineCallbacks
def get_and_merge_cmdsets(caller, session, player, obj, callertype, raw_string):
assistant
#Here is the Python code you requested.

    """Gather all relevant cmdsets and merge them.
    Args:
    caller (Session, Player or Object): The entity executing the command. Which
    type of object this is depends on the current game state; for example
    when the user is not logged in, this will be a Session, when being OOC
    it will be a Player and when puppeting an object this will (often) be
    a Character Object. In the end it depends on where the cmdset is stored.
    session (Session or None): The Session associated with caller, if any.
    player (Player or None): The calling Player associated with caller, if any.
    obj (Object or None): The Object associated with caller, if any.
    callertype (str): This identifies caller as either "player", "object" or "session"
    to avoid having to do this check internally.
    raw_string (str): The input string. This is only used for error reporting.
    Returns:
    cmdset (Deferred): This deferred fires with the merged cmdset
    result once merger finishes.
    Notes:
    The cdmsets are merged in order or generality, so that the
    Object\s cmdset is merged last (and will thus take precedence
    over same-named and same-prio commands on Player and Session).
    """
    try:
        @inlineCallbacks
        def _get_channel_cmdset(player_or_obj):
            '\n                                                Helper-method;    Get    channel-cmdsets\n                                                '
            try:
                channel_cmdset = (yield CHANNELHANDLER.get_cmdset(player_or_obj))
                returnValue([channel_cmdset])
            except Exception:
                _msg_err(caller, _ERROR_CMDSETS)
                raise ErrorReported(raw_string)
        @inlineCallbacks
        def _get_local_obj_cmdsets(obj):
            '\n                                                Helper-method;    Get    Object-level    cmdsets\n                                                '
            try:
                local_obj_cmdsets = [None]
                try:
                    location = obj.location
                except Exception:
                    location = None
                if location:
                    local_objlist = (yield ((location.contents_get(exclude=obj) + obj.contents_get()) + [location]))
                    local_objlist = [o for o in local_objlist if (not o._is_deleted)]
                    for lobj in local_objlist:
                        try:
                            _GA(lobj, 'at_cmdset_get')(caller=caller)
                        except Exception:
                            logger.log_trace()
                    local_obj_cmdsets = (yield list(chain.from_iterable((lobj.cmdset.cmdset_stack for lobj in local_objlist if (lobj.cmdset.current and lobj.access(caller, access_type='call', no_superuser_bypass=True))))))
                    for cset in local_obj_cmdsets:
                        cset.old_duplicates = cset.duplicates
                        cset.duplicates = (True if (cset.duplicates is None) else cset.duplicates)
                returnValue(local_obj_cmdsets)
            except Exception:
                _msg_err(caller, _ERROR_CMDSETS)
                raise ErrorReported(raw_string)
        @inlineCallbacks
       ...