def _set_traffic_class_mutation_mappings(self, v, load=False):
    """
    Setter method for traffic_class_mutation_mappings, mapped from YANG variable /qos/map/traffic_class_mutation/traffic_class_mutation_mappings (list)
    If this variable is read-only (config: false) in the
    source YANG file, then _set_traffic_class_mutation_mappings is considered as a private
    method. Backends looking to populate this variable should
    do so via calling thisObj._set_traffic_class_mutation_mappings() directly.
    """
    if hasattr(v, "_utype"):
      v = v._utype(v)
    try:
      t = YANGDynClass(v,base=YANGListType("from_traffic_class",traffic_class_mutation_mappings.traffic_class_mutation_mappings, yang_name="traffic-class-mutation-mappings", rest_name="map", parent=self, is_container='list', user_ordered=False, path_helper=self._path_helper, yang_keys='from-traffic-class', extensions={u'tailf-common': {u'info': u'Map Traffic-Class value to outbound Traffic-Class value.', u'cli-no-key-completion': None, u'cli-suppress-mode': None, u'cli-suppress-list-no': None, u'cli-full-no': None, u'alt-name': u'map', u'cli-compact-syntax': None, u'cli-sequence-commands': None, u'cli-incomplete-command': None, u'callpoint': u'traffic_class_mutation_mapping'}}), is_container='list', yang_name="traffic-class-mutation-mappings", rest_name="map", parent=self, path_helper=self._path_helper, extmethods=self._extmethods, register_paths=True, extensions={u'tailf-common': {u'info': u'Map Traffic-Class value to outbound Traffic-Class value.', u'cli-no-key-completion': None, u'cli-suppress-mode': None, u'cli-suppress-list-no': None, u'cli-full-no': None, u'alt-name': u'map', u'cli-compact-syntax': None, u'cli-sequence-commands': None, u'cli-incomplete-command': None, u'callpoint': u'traffic_class_mutation_mapping'}}, namespace='urn:brocade.com:mgmt:brocade-qos-mls', defining_module='brocade-qos-mls', yang_type='list', is_config=True)
    except (TypeError, ValueError):
      raise ValueError({
          'error-string': """traffic_class_mutation_mappings must be of a type compatible with list""",
          'defined-type': "list",
          'generated-type': """YANGDynClass(base=YANGListType("from_traffic_class",traffic_class_mutation_mappings.traffic_class_mutation_mappings, yang_name="traffic-class-mutation-mappings", rest_name="map", parent=self, is_container='list', user_ordered=False, path_helper=self._path_helper, yang_keys='from-traffic-class', extensions={u'tailf-common': {u'info': u'Map Traffic-Class value to outbound Traffic-Class value.', u'cli-no-key-completion': None, u'cli-suppress-mode': None, u'cli-suppress-list-no': None, u'cli-full-no': None, u'alt-name': u'map', u'cli-compact-syntax': None, u'cli-sequence-commands': None, u'cli-incomplete-command': None, u'callpoint': u'traffic_class_mutation_mapping'}}), is_container='list', yang_name="traffic-class-mutation-mappings", rest_name="map", parent=self, path_helper=self._path_helper, extmethods=self._extmethods, register_paths=True, extensions={u'tailf-common': {u'info': u'Map Traffic-Class value to outbound Traffic-Class value.', u'cli-no-key-completion': None, u'cli-suppress-mode': None, u'cli-suppress-list-no': None, u'cli-full-no': None, u'alt-name': u'map', u'cli-compact-syntax': None, u'cli-sequence-commands': None, u'cli-incomplete-command': None, u'callpoint': u'traffic_class_mutation_mapping'}}, namespace='urn:brocade.com:mgmt:brocade-qos-mls', defining_module='brocade-qos-mls', yang_type='list', is_config=True)""",
        })

    self.__traffic_class_mutation_mappings = t
    if hasattr(self, '_set'):
      self._set()