when the code jumps into the functionthe values for abcd will be popped off the stack the spam element will be popped off first and assigned to dthen "hamwill be assigned to cand so ondef somefunc(abcd)print("function executed"stack implementation now let us study an implementation of stack in python we start off by creating node classjust as we did in the previous with listsclass nodedef __init__(selfdata=none)self data data self next none this should be familiar to you by nowa node holds data and reference to the next item in list we are going to implement stack instead of listbut the same principle of nodes linked together still applies now let us look at the stack class it starts off similar to singly linked list we need to know the node at the top of the stack we would also like to keep track of the number of nodes in the stack so we will add these fields to our classclass stackdef __init__(self)self top none self size push operation the push operation is used to add an element to the top of the stack here is an implementationdef push(selfdata)node node(dataif self topnode next self top self top node elseself top node self size +