The implementation of choice for an abstract data type such as a stack is the creation of a new method.

To peak -see the last item- in stack named 'items', you use .......

in Simple Balance Parentheses:
Closing symbols match opening symbols in the ................. order of their appearance.

A stack is a collection of objects that are inserted and removed according to the (FIFO) principle

A user may insert objects into a stack at any time, but may only access or remove the most recently inserted object that remains (at the so-called “ top” of the stack).

Stacks are the simplest of all data structures, yet they are also among the most important

creates a new stack that is empty. It needs no parameters and returns an empty stack.

peek() : adds a new item to the top of the stack. It needs the item and returns nothing

pop() : removes the top item from the stack. It needs no parameters and returns the item

tests to see whether the stack is empty. It needs no
parameters and returns a boolean value.

peek() returns the bottom item from the stack but does not remove it. It needs no parameters

size(): returns the number of items on the stack. It needs no parametersand returns an integer

used in many applications, such as the Internet Web browsers history and the “undo” mechanism in Text editors

stack

peek() : adds a new item to the top of the stack. It needs the item and returns nothing. this definition is not true.

The order of insertion is the reverse of the order of removalqueue

Using python list , Stack ADT "push()" is implemented using append (item)

Using python list , Stack ADT "peek()"
is implemented using [len (self.item) +1]

Using python list , Stack ADT "size()" is implemented using " len (self.item) "

Deque is a hybrid linear structure, so it requires the LIFO and FIFO ordering.