advanced linked lists we must ensure this operation also works for list containing single nodeas illustrated in figure when curnode is advanced to the next nodeit actually still references itself this is appropriate since the node is both the first and last node in the list after the node is visited and the data printed in this examplecurnode is advanced once again when the alias test is performed at the bottom of the loopdone will be set to true and the loop will terminate properly listref curnode "bfigure traversing circular linked list containing single node searching the search operation requires traversal through the listalthough it can terminate early if we encounter the target item or reach an item larger than the target the implementationshown in listing closely follows that of the traversal operation from earlier listing searching circular linked list def searchcircularlistlistreftarget )curnode listref done listref is none while not done curnode curnode next if curnode data =target return true else done curnode is listref or curnode data target return false as with the traversal operationthe initialization of done handles the case where the list is empty and prevents the loop from ever being executed the modification of the done flag at the bottom of the loop handles the termination of the traversal when the target is not found compound logical expression is used in order to test both conditionsa complete traversal was performed or we reached an item larger than the target finallythe condition in the if statement handles the case where the target item is found in the list