code: def insert(self, item):
          'Insert a new item.  If equal keys are found, add to the left'
          k = self._key(item)
          i = bisect_left(self._keys, k)
          self._keys.insert(i, k)
          self._items.insert(i, itemf insert(self, item):
          'Insert a new item.  If equal keys are found, add to the left'
          k = self._key(item)
          i = bisect_left(self._keys, k)
          self._keys.insert(i, k)
          self._items.insert(i, item)
docs: Insert a new item.  If equal keys are found, add to the left