Related chapter: Python Basics

Exercise 1: Temperature Converter

Write a program that converts Celsius to Fahrenheit.

  Input:  25
Output: 25°C = 77.0°F

Formula: F = C × 9/5 + 32

Hint

Use float(input()) and an f-string with :.1f for one decimal place.

Exercise 2: String Analyzer

Write a function analyze(text) that returns a dict with:

  • length — number of characters
  • words — number of words
  • uppercase — count of uppercase letters
  analyze("Hello World!")
# {'length': 12, 'words': 2, 'uppercase': 2}

Exercise 3: Even or Odd

Write a program that reads an integer and prints whether it’s even or odd, without using %.

Hint

Use n // 2 * 2 == n or bitwise n & 1 == 0.

Exercise 4: Shopping Total

Given a list of prices, calculate the total, average, and most expensive item:

  prices = [12.99, 5.50, 24.00, 8.75, 3.25]
# Total: 54.49, Average: 10.90, Max: 24.00

Exercise 5: Word Counter

Ask the user for a sentence and print the count of each word (case-insensitive):

  Input:  "The cat and the dog"
Output: the: 2, cat: 1, and: 1, dog: 1
Hint

Use .lower().split() and a dictionary to count occurrences.

Exercise 6: FizzBuzz

Print numbers 1 to 30, but:

  • “Fizz” for multiples of 3
  • “Buzz” for multiples of 5
  • “FizzBuzz” for multiples of both

Challenge: Password Validator

Write is_valid_password(password) that returns True if the password:

  • Is at least 8 characters long
  • Contains at least one uppercase letter
  • Contains at least one digit
  • Contains at least one special character (!@#$%^&*)

Test with: "weak", "Strong1!", "NoSpecial1", "alllowercase!"

Solution (Exercise 1) 
  celsius = float(input("Enter °C: "))
fahrenheit = celsius * 9 / 5 + 32
print(f"{celsius}°C = {fahrenheit:.1f}°F")
Solution (Exercise 5) 
  sentence = input("Enter a sentence: ")
counts = {}
for word in sentence.lower().split():
    counts[word] = counts.get(word, 0) + 1
for word, count in sorted(counts.items()):
    print(f"{word}: {count}")

Exercise 7: List Statistics

Write stats(numbers) returning min, max, mean, and median for a non-empty list of numbers.

  stats([3, 1, 4, 1, 5, 9, 2, 6])
# {'min': 1, 'max': 9, 'mean': 3.875, 'median': 3.5}

Exercise 8: Reverse Words

Write reverse_words(sentence) that reverses the order of words but not characters within each word.

  reverse_words("Python is awesome")
# "awesome is Python"

Next: Control Flow Exercises