Data Structures in Python: Stack

The above figure is a good example of stack data structure in Python. Suppose stones arranged on top of each other are elements of stack now the last stone added is the topmost one and if we want to remove a stone we will remove the last one added that is from the top. So we can observe a pattern of Last In First Out(LIFO) i.e. the last element added is the first element retrieved. That‘s so simple.

We already read a data structure that can be used as a stack and guess which one? The answer is a List. Yes, because in the list using append we can add elements to the end, and using pop we can remove the element that was added last.

Let’s create a list:

stack = [1,2,3,4,5]

Here we have a list named stack with some values init.

Adding Element

Using the append method we can add elements to the end:

stack.append(6)
stack.append(7)
print(stack)
#OUTPUT
[1,2,3,4,5,6,7]

Removing Element

Using the pop method we can remove the last element added:

print(stack.pop())
#OUTPUT
7

That’s all for the stack. It’s so simple and easy to understand. I hope you understood properly if not I would say read it again especially the first paragraph.

Lectures

Lecture 1: https://medium.com/@saifmdco/data-structures-with-python-introduction-4dadeffa2215

Lecture 2: https://medium.com/@saifmdco/data-structures-with-python-arrays-c498518bf7fd

Lecture 3: https://medium.com/@saifmdco/data-structures-in-python-lists-653a3ad103ab

Lecture 4: https://medium.com/@saifmdco/data-structures-in-python-tuples-3c350640cd9a

Lecture 5: https://medium.com/@saifmdco/data-structures-in-python-dictionary-fad27ffdda8b

Lecture 6: https://medium.com/@saifmdco/data-structures-in-python-2d-array-6bc0154aa717

Lecture 7: https://medium.com/@saifmdco/data-structures-in-python-matrix-22adba5aa597

Lecture 8: https://medium.com/@saifmdco/data-structures-in-python-sets-92d5445e97e8

Lecture 9: https://medium.com/@saifmdco/data-structures-in-python-chainmap-fca2a9d47249

Lecture 10: https://medium.com/@saifmdco/data-structures-in-python-linkedlist-50f2118c659e

Lecture 11: https://medium.com/@saifmdco/data-structures-in-python-stack-6bf182d63581

Lecture 12: https://medium.com/@saifmdco/data-structures-in-python-queue-6361d3dcff0

Lecture 13: https://medium.com/@saifmdco/data-structures-in-python-dequeue-1a585e269a55

Lecture 14: https://medium.com/@saifmdco/data-structures-in-python-custom-stack-b7b9173b4eae

Lecture 15: https://medium.com/@saifmdco/data-structures-in-python-hash-table-39be784eefc1

Lecture 16: https://medium.com/@saifmdco/data-structures-in-python-doubly-linked-list-fe698d74756c