Mission Dashboard
Vidya Python Core
Level 3 — OOP & File I/O — Classes, inheritance, files, exceptions, modules, and decorators.
Active Mission PayloadBlueprint Sutra
Classes & Objects
Define classes with attributes and methods, create objects, and use operator overloading.
Python Sandbox Preview
class BankAccount:
def __init__(self, owner, balance=0):
self.owner = owner
self.balance = float(balance)
def deposit(self, amount):
self.balance += amountUTF-8 · Interactive Sandbox Target Code
What this Mission Builds
Classes are blueprints for custom types. Bundle data and behaviour into reusable objects — the foundation of OOP.
•Define classes with __init__ and methods
•Create and use instances
•Implement __str__ and operator overloading
Duration
50 min
Difficulty
3/5
Rank Reward
+150 XP
Practice Lab — 🏗️ Classes & Objects
15 Coding Challenges · 5 Difficulty Tiers
Complete all tiers to earn up to 1,690 XP and unlock the next chapter.
🟢Beginner Tier3 programs · +180 XP
🔵Intermediate Tier3 programs · +250 XP
🏦#1
+80 XPBank Account
Model a bank account with deposit, withdraw, and balance
class with stateguard conditions 12m
📓#2
+85 XPStudent Grade Book
Class managing a list of grades with statistics
list attributeaggregation methods 13m
📚#3
+85 XPStack Class
Implement a stack using a class wrapping a list
stack ADTencapsulation 13m
🟡Advanced Tier3 programs · +335 XP
½#1
+105 XPFraction Class
Implement a Fraction with operator overloading
operator overloading__add__ __sub__ __mul__ 18m
🔗#2
+115 XPLinked List Node
Build a singly linked list from Node objects
Node classlinked list 20m
↗️#3
+115 XPVector2D
2D vector class with full operator overloading
operator overloading__str__ 20m
🔴LeetCode Tier3 programs · +415 XP
⬇️#1
+135 XPMin Stack
Stack that retrieves minimum element in O(1)
O(1) min retrievalauxiliary stack 18m
🗃️#2
+140 XPLRU Cache Class
Full LRU Cache with O(1) get and put using OrderedDict
LRU cacheOrderedDict 20m
↔️#3
+140 XPDesign Queue from Two Stacks
FIFO queue implemented using two LIFO stacks
queue from stacksamortized O(1) 20m
🏆Hackathon Tier3 programs · +510 XP
📚#1
+165 XPLibrary Management System
Multi-class system: Book, Member, Library
multi-class designcomposition 30m
🧮#2
+160 XPExpression Evaluator
Class-based tokeniser and evaluator for arithmetic expressions
expression evaluationeval 25m
🔢#3
+185 XPSparse Matrix
Memory-efficient sparse matrix with dict-of-dicts storage
sparse matrixdict-of-dicts 35m
Complete all 5 tiers to earn the Classes & Objects Master badge
Start Beginner