Interactive Python Lab

For Loops & Range

Playground load hone par auto-run hota hai. Apne Python ko trace karne ke liye Mera Code Chalao par click karein — har step live animated.

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

total = 0. Accumulator starts at the additive identity.

Yeh approach kyun?

We initialize total before the loop. Variables used inside a loop and defined outside persist across iterations — that's what makes them accumulators.

Structured Explanation

Overview

for loop kisi bhi sequence (list, string, range) ke upar iterate karta hai. Python ka ye sabse popular loop hai.

Analogy

Jaise roll call mein ek-ek karke har student ka naam pukaarna.

Step-by-step

for item in sequence: likho
Body mein item use karo
range() se numbers iterate karo
enumerate() se index bhi saath mein milti hai

Visual

for i in range(5): print(i) # 0,1,2,3,4 for char in "hello": print(char)

Common mistakes

Loop ke andar sequence modify karna
range(n) 0 se n-1 tak hai, n tak nahi
Loop variable loop ke baad bhi accessible hoti hai Python mein

Practice questions

List ke squares print karo for loop se
String mein vowels count karo

Complexity

Time

O(n)

Space

O(1)

Complexity Overview

O(1)space

O(log n)

O(n)time

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

Fruits ki list par loop karo aur enumerate() se har item index ke saath print karo.

Hint

enumerate(list) (index, value) pairs deta hai. For statement mein unpack karo.

Code Studio

For Loops & Range

Monaco Ready

Python ready hai

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Output Console

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Real-World Applications

1

Bulk record processing in databases

2

Dispatching pipeline notifications

3

Transforming arrays

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