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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _get_subclass_list_for_enums(self, classname, namespace):
 """ Get class list (i.e names of subclasses for classname for the enumerateinstance methods. If conn.lite returns only classname but no subclasses. Returns NocaseDict where only the keys are important, This allows case insensitive matches of the names with Python "for cln in clns". """

        if self._repo_lite:
            return NocaseDict({classname: classname})
        if not self._class_exists(classname, namespace):
            raise CIMError(
                CIM_ERR_INVALID_CLASS,
                _format("Class {0!A} not found in namespace {1!A}.",
                        classname, namespace))

        if not self.classes:
            return NocaseDict()

        clnslist = self._get_subclass_names(classname, namespace, True)
        clnsdict = NocaseDict()
        for cln in clnslist:
            clnsdict[cln] = cln

        clnsdict[classname] = classname
        return clnsdict