Learn Python String Methods & Formatting with Coding Exercises.

Test your Python skills with Coding Exercises on string methods and formatting. Great for beginners learning Python strings through hands-on practice.

Topic: strings

🧪 Coding Exercises

🟢 Beginner Exercises

1. ✅ String Information

Ask the user for their name and print:
- The name in all uppercase
- The name in all lowercase
- The number of characters in the name

Requirements

• - Use `input()`, `upper()`, `lower()`, and `len()`

Input

name = input("Enter your name: ")

Expected Output

Uppercase: JOHN
Lowercase: john
Length: 4

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2. ✅ Remove Extra Spaces

Given a string with leading and trailing spaces, remove them and print the cleaned sentence.

Requirements

• - Use the `strip()` method.

Input

sentence = "   Python is fun!   "

Expected Output

Cleaned Sentence: Python is fun!

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3. ✅ String Alignment

Align the word "Code" within a 20-character width using different alignments.

Requirements

• - Use `center()`, `ljust()`, and `rjust()`

Input

word = "Code"

Expected Output

Centered :        Code        
Left     : Code               
Right    :               Code

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4. ✅ String Slicing

Perform slicing on the string "Python Programming":
- Extract and print the first 6 characters
- Extract and print the last 11 characters
- Extract and print characters from index 7 to 17

Requirements

• - Use slicing syntax with `[]`

Input

text = "Python Programming"

Expected Output

First 6 characters: Python
Last 11 characters: Programming
Characters 7 to 17: Programming

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5. ✅ String Formatting

Given name and age variables, print: "My name is Alice and I am 30 years old."

Requirements

• - Use f-strings or `format()` for string formatting.

Input

name = "Alice"
age = 30

Expected Output

My name is Alice and I am 30 years old.

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🟡 Intermediate Exercises

1. ✅ Replace Second Character Occurrence

Write a Python function `replace_second_occurrence(main_string, old_char, new_char)` 
- that replaces the second occurrence of `old_char` with `new_char` in `main_string`. 
- If `old_char` appears fewer than two times, the string should remain unchanged.

Requirements

• - Define a function named `replace_second_occurrence` that accepts three arguments: - the main string, the character to be replaced (old_char), and the new character (new_char). - Use `str.find()` or `str.index()` to locate the position of the first occurrence of `old_char`. - Use string slicing and concatenation to reconstruct the string, ensuring only the second occurrence is replaced. - Handle cases where the `old_char` does not appear at least twice in the string.

Input

# Example 1: Basic replacement
main_string_1 = "hello world"
old_char_1 = "l"
new_char_1 = "X"

# Example 2: Another replacement
main_string_2 = "banana"
old_char_2 = "a"
new_char_2 = "Z"

# Example 3: Character appears only once
main_string_3 = "apple"
old_char_3 = "P" # Case sensitive, no match for 'P'
new_char_3 = "Q"

# Example 4: Character does not exist
main_string_4 = "test"
old_char_4 = "z"
new_char_4 = "Q"

Expected Output

Original: hello world, Old Char: l, New Char: X -> Result: helXo world
Original: banana, Old Char: a, New Char: Z -> Result: banZna
Original: apple, Old Char: P, New Char: Q -> Result: apple
Original: test, Old Char: z, New Char: Q -> Result: test

📚 📺 Watch the solution now!

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🔴 Advanced Exercises

🧠 Practice & Progress

• ✅ True or False
• ✍️ Fill in the Blanks
• 📝 Multiple-Choice Questions (MCQs)
• 🔍 Find and Fix Mistakes
🌐 ✅ Online Quizzes - Test your Knowledge 📊
• 💻 Online Quiz
• 🏋️‍♂️ Exercises
• 🧪 Mini Projects
• 🔄 Review Questions

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