Python 4a

Title: Python 4a

URL Source: https://medium.com/@Commoness/python-4a-6dd7850f9df1?source=rss------python-5

Published Time: 2026-04-17T18:11:01Z

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# Python 4a. Python Indexing | by The Commoness | Apr, 2026 | Medium

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# Python 4a

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## Python Indexing

## Imagine This

You have a **school bag with items arranged in order**:

bag = ["Book", "Pen", "Pencil", "Eraser", "Scale"]
Each item has a **position number** (index)

Step 1: Normal Indexing (Left → Right)


print(bag[0]) # Book

print(bag[2]) # Pencil
Python always starts counting from **0 (not 1)**

## Step 2: Negative Indexing (Right → Left)

Now imagine taking items from the **end of the bag**


REVERSE INDEXING

print(bag[-1]) # Scale

print(bag[-3]) # Pencil
## **Slicing**

Slicing means:

**“Give me some items from the list”**

list[start : stop : step]


example 1:

bag = ["pen","pencil","eraser"]

print(bag[1:4]) # 1 is to begin so index of one is pen

#index of 4 is pos-1 (4-1 =3) so it is eraser

#Start is INCLUDED

Stop is EXCLUDED

Think like:

“Start eating from here, but STOP before this”
## What if you leave spaces?

## Case 1: `[:stop]`

print(bag[:3])
Mean