support for deletions def rebalance delete(selfp)if len(self= special caseensure that root is black self set black(self root)elif is not nonen self num children(pif = deficit exists unless child is red leaf next(self children( )if not self is red leaf( )self fix deficit(pcelif = removed black node with red child if self is red leaf(self left( ))self set black(self left( )elseself set black(self right( )def fix deficit(selfzy)"""resolve black deficit at zwhere is the root of heavier subtree ""if not self is red( ) is blackwill apply case or self get red child(yif is not nonecase is black and has red child xdo "transferold color self is red(zmiddle self restructure(xmiddle gets old color of self set color(middleold colorchildren become black self set black(self left(middle)self set black(self right(middle)elsecase is blackbut no red childrenrecolor as "fusionself set red(yif self is red( )this resolves the problem self set black(zelif not self is root( )self fix deficit(self parent( )self sibling( )recur upward elsecase is redrotate misaligned -node and repeat self rotate(yself set black(yself set red(zif =self right( )self fix deficit(zself left( )elseself fix deficit(zself right( )code fragment conclusion of the redblacktreemap class (continued from code fragment