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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 update_config_value(self, config_m, config_key):
 """Updates the corresponding list store of a changed config value :param ConfigModel config_m: The config model that has been changed :param str config_key: The config key who's value has been changed """

        config_value = config_m.get_current_config_value(config_key)
        if config_m is self.core_config_model:
            list_store = self.core_list_store
        elif config_m is self.gui_config_model:
            list_store = self.gui_list_store
        else:
            return
        self._update_list_store_entry(list_store, config_key, config_value)