I Built Stack Data Structure in Python (3 mins guide)
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🧠 Learn Stacks in Python in 3-Minutes!
A stack is a simple data structure that works like a pile of plates: LIFO (Last In, First Out). Let’s build one from scratch in Python using a class! 🎉
📦 1. Create a Stack Class
class Stack:
def __init__(self):
self.items = [] # Use a list to hold stack elements
📥 Push: Add an item to the stack
def push(self, item):
self.items.append(item)
📤 Pop: Remove and return the top item
def pop(self):
if not self.is_empty():
return self.items.pop()
return "Stack is empty!"
👀 Peek: Look at the top item without removing it
def peek(self):
if not self.is_empty():
return self.items[-1]
return "Stack is empty!"
❓ Is Empty: Check if the stack is empty
def is_empty(self):
return len(self.items) == 0
📏 Size: Check the size of the stack
def size(self):
return len(self.items)
🛠️ 2. Use the Stack
stack = Stack() # Create a stack
stack.push(1) # Add 1
stack.push(2) # Add 2
print(stack.peek()) # Peek: 2️⃣
print(stack.pop()) # Pop: 2️⃣
print(stack.size()) # Size: 1️⃣
💡 Why Use a Stack?
Undo/redo operations 📝
Backtracking algorithms 🧩
Expression evaluation 📜
🔑 Key Takeaway: Stacks are super easy to implement in Python and incredibly useful in programming!
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