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Algorithms & data structures

Classic patterns — search, sort, stacks, queues, and practical complexity-aware code.

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Algorithms & data structures easy

Implement a Stack Using List Push Pop in Python

A minimal Stack class built on a Python list, with push, pop, peek, is_empty, and size methods, including empty-stack guards.

stack data-structures list
Python 
class Stack:
    def __init__(self):
        self.items = []

    def push(self, item):
        self.items.append(item)

    def pop(self):
        if self.is_empty():
            raise IndexError("pop from empty stack")
        return self.items.pop()

    def peek(self):
        if self.is_empty():
            raise…
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