operation complexity usage method list creation (len( ) linkedlist(ycalls __init__(yindexed get (na [ix __getitem__(iindexed set (nx[ia __setitem__( ,aconcatenate (nz= + __add__(yappend ( append(ax append(ainsert (nx insert( ,ex insert( , )delete (ndel [ix __delitem__(iequality (nx = __eq__(yiterate (nfor in xx __iter__(length ( len(xx __len__(membership (na in __contains__(asort / / / fig complexity of linkedlist operations of the operations appear to have the same complexity as the list datatype operations presented in fig there are some important differences though the following sections will provide the implementations for some of these operations and point out the differences as compared to the list datatype operations given in fig the linkedlist constructor class linkedlist this class is used internally by the linkedlist class it is invisible from outside this class due to the two underscores that precede the class name python mangles names so that they are not recognizable outside the class when two underscores precede name but aren' followed by two underscores at the end of the name ( an operator nameclass __nodedef __init__(self,item,next=none)self item item self next next def getitem(self)return self item def getnext(self)return self next def setitem(selfitem)self item item def setnext(self,next)self next next def __init__(self,contents=[])here we keep reference to the first node in the linked list this copy belongs to 'acha