def func(self):
        "Implements the spawner"

        def _show_prototypes(prototypes):
            "Helper to show a list of available prototypes"
            string = "\nAvailable prototypes:\n %s"
            string = string % utils.fill(", ".join(sorted(prototypes.keys())))
            return string

        prototypes = spawn(return_prototypes=True)
        if not self.args:
            string = "Usage: @spawn {key:value, key, value, ... }"
            self.caller.msg(string + _show_prototypes(prototypes))
            return
        try:
            # make use of _convert_from_string from the SetAttribute command
            prototype = _convert_from_string(self, self.args)
        except SyntaxError:
            # this means literal_eval tried to parse a faulty string
            string = "{RCritical Python syntax error in argument. "
            string += "Only primitive Python structures are allowed. "
            string += "\nYou also need to use correct Python syntax. "
            string += "Remember especially to put quotes around all "
            string += "strings inside lists and dicts.{n"
            self.caller.msg(string)
            return

        if isinstance(prototype, basestring):
            # A prototype key
            keystr = prototype
            prototype = prototypes.get(prototype, None)
            if not prototype:
                string = "No prototype named '%s'." % keystr
                self.caller.msg(string + _show_prototypes(prototypes))
                return
        elif not isinstance(prototype, dict):
            self.caller.msg("The prototype must be a prototype key or a Python dictionary.")
            return

        if not "noloc" is self.switches and not "location" in prototype:
            prototype["location"] = self.caller.location

        for obj in spawn(prototype):
            self.caller.msg("Spawned %s." % obj.get_display_name(self.caller))
dataset/ETHPy150Open evennia/evennia/evennia/commands/default/building.py/CmdSpawn.func/operator `in` -> `is`