String indexing (positive and negative) in Python - Mini Project: Build & Apply

String Indexing (Positive and Negative)

📖 Scenario: You are working with a simple text message and want to learn how to access specific characters using their positions.

🎯 Goal: Learn how to use positive and negative indexing to get characters from a string.

📋 What You'll Learn

Create a string variable with a specific message

Create an index variable for positive indexing

Use positive and negative indexing to get characters from the string

Print the characters obtained from both indexing methods

💡 Why This Matters

🌍 Real World

Accessing specific characters in strings is useful when processing text data, like extracting initials or checking certain letters.

💼 Career

Understanding string indexing is fundamental for programming tasks such as parsing user input, validating data, and manipulating text in software development.

1

Create the message string

Create a string variable called message and set it to the exact value "Hello, World!".

Python

# Create the string variable 'message' with the value "Hello, World!"
# Your code here

Need a hint?

Use quotes to create a string and assign it to the variable message.

2

Create the positive index variable

Create an integer variable called pos_index and set it to 7.

Python

message = "Hello, World!"
# Create the integer variable 'pos_index' and set it to 7
# Your code here

Need a hint?

Just assign the number 7 to the variable pos_index.

3

Get characters using positive and negative indexing

Create two variables: char_pos to get the character at pos_index from message, and char_neg to get the character at negative index -6 from message.

Python

message = "Hello, World!"
pos_index = 7
# Get the character at 'pos_index' from 'message' and store in 'char_pos'
# Get the character at negative index -6 from 'message' and store in 'char_neg'
# Your code here

Need a hint?

Use square brackets with the index to get characters from the string.

4

Print the characters from both indexes

Print the variables char_pos and char_neg separated by a space.

Python

message = "Hello, World!"
pos_index = 7
char_pos = message[pos_index]
char_neg = message[-6]
# Print 'char_pos' and 'char_neg' separated by a space
# Your code here

Need a hint?

Use print(char_pos, char_neg) to print both characters with a space.