<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _SyncAttributes(self):
 """Sync the new attributes to the synced attribute cache. This maintains object validity. """

    # This effectively moves all the values from the new_attributes to the
    # synced_attributes caches.
    for attribute, value_array in iteritems(self.new_attributes):
      if not attribute.versioned or self.age_policy == NEWEST_TIME:
        # Store the latest version if there are multiple unsynced versions.
        value = value_array[-1]
        self.synced_attributes[attribute] = [
            LazyDecoder(decoded=value, age=value.age)
        ]

      else:
        synced_value_array = self.synced_attributes.setdefault(attribute, [])
        for value in value_array:
          synced_value_array.append(LazyDecoder(decoded=value, age=value.age))

        synced_value_array.sort(key=lambda x: x.age, reverse=True)

    self.new_attributes = {}
    self._to_delete.clear()
    self._dirty = False
    self._new_version = False