Full Mark Command

class CmdMark(Command):
    """
    Mark the current location.

    Usage:
        mark <custom mark name>

    Marks the player's current location, using the provided arguments.
    For a list of marks, simply type 'mark' with no argument.
    """
    key = "mark"

    def func(self):
        caller = self.caller
        if not caller.attributes.has('mark'):
            caller.db.mark = {}
        mark = caller.db.mark
        if not self.args:
            marks = ""
            for x in mark:
                marks = f'{marks}\n    |w{x}|n'
            caller.msg(f"List of Marks: {marks}")
            return

        caller.db.mark[self.args] = caller.location.dbref
        caller.msg(f"{self.args} was added to your list of marks as {caller.location.get_display_name(caller)}.")