Interactive Python Lab

Lists Basics

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Samjhein·Line by line

Replay·Step by step

Challenge·Guided prompts

XP·...

Data Flow Pipeline

foundation Track

Variables & Types

If / Else Conditions

While Loops

For Loops & Range

Hello World & Print

String Operations

Arithmetic & Math

Lists Basics

Functions Intro

Input & Output

Samjhein

Line 1

Create list

Yeh approach kyun?

Lists are mutable, ordered collections that can hold any type of data

Structured Explanation

Overview

List Python ka sabse flexible data structure hai — ordered, mutable, aur mixed types allow karta hai.

Analogy

List ek numbered dabba hai — pehle dabbon mein pehli cheez, aur easily add/remove kar sakte ho.

Step-by-step

Square brackets mein items daalo: [1, 2, 3]
Index se access karo: list[0] pehla element
append() se end mein add karo
remove() ya pop() se delete karo

Visual

fruits = ["apple", "banana", "cherry"] fruits[0] # "apple" fruits[-1] # "cherry" fruits[1:3] # ["banana", "cherry"]

Common mistakes

Index 0 se shuru hota hai, 1 se nahi
Negative index — -1 last element hai
Slice end exclusive hai: [1:3] mein index 3 nahi aata

Practice questions

Shopping list banao aur items add/remove karo
List ko reverse karo bina built-in use kiye

Complexity

Time

O(n) for insert/remove

Space

O(n)

Complexity Overview

O(1)

O(log n)

O(n)timespace

O(n log n)

O(n²)

n = 8range 1-20

N = 8 pe

Complexity	Operations
O(1)	1
O(log n)	3
O(n)	8
O(n log n)	24
O(n²)	64

Challenge

5 numbers ki list banao. 99 append karo, smallest hatao, phir sorted print karo.

Hint

append(), remove(), aur sorted() use karo. min() function smallest value dhundta hai.

Code Studio

Lists Basics

Monaco Ready

Python ready hai

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Output Console

2 lines

❯ ['apple', 'apricot', 'cherry', 'date']

❯ apple date 5 cherry

Real-World Applications

1

Stack architectures

2

Collecting unsorted application state

3

JSON payload containers

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