String Manipulations

Table of Contents

1. What is a String?
2. Common String Operations
3. Tasks

1. What is a String?

• A string is a sequence of characters enclosed in quotes.
  • Examples: "hello", 'Python', "1234"

Creating Strings:

name = "Alice"
greeting = 'Hello'

2. Common String Operations:

1. Concatenation (joining strings):

   first = "Hello"
   second = "World"
   result = first + " " + second  # Output: "Hello World"

2. Repetition:

   word = "Hi"
   print(word * 3)  # Output: "HiHiHi"

3. Indexing:

   text = "Python"
   print(text[0])  # Output: "P"
   print(text[-1]) # Output: "n"

4. Slicing:

   text = "Python"
   print(text[0:3])  # Output: "Pyt"
   print(text[2:])   # Output: "thon"

Tasks

🔹 Task 1: Concatenate Two Strings

Instruction:
Take two words like "Hello" and "World" and combine them into one sentence with a space in between.

Concept: String concatenation using the + operator.

🔹 Task 2: Access Characters by Index

Instruction:
Given the word "Python", find out what the first character and the last character are.

Concept: Accessing characters using index numbers (positive and negative indexing).

🔹 Task 3: Slice a Substring

Instruction:
From the word "Python", extract only the first three letters.

Concept: String slicing (extracting parts of a string using index ranges).

🔹 Task 4: Measure String Length

Instruction:
Enter any word or sentence and find out how many characters it contains.

Concept: Using the len() function to count characters.