Method _wrap

recipes/Python/440673_Safe_heap_queue_class/recipe-440673.py:140–143

(self, item)

    #---- 'private' methods --------------------------------------------------

    def _wrap(self, item):
        if self._key is not None:
            item = (self._key(item),item)
        return item

    def _unwrap(self, item):
        if self._key is not None: