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1. Print "Hello, World!"2. Add Two Numbers3. Swap Two Variables4. Find ASCII Value of a Character5. Check Even or Odd6. Find Largest of Two Numbers7. Find Largest of Three Numbers8. Check Positive, Negative, or Zero9. Convert Kilometers to Miles10. Convert Celsius to Fahrenheit11. Calculate Area of a Triangle12. Calculate Simple Interest13. Calculate Compound Interest14. Calculate Square Root15. Convert Seconds to Hours, Minutes, and Seconds16. Calculate Body Mass Index (BMI)17. Check Leap Year18. Find Absolute Value19. Calculate Age from Birth Year20. Sum of First N Natural Numbers21. Calculate Power Without Using pow()22. Print Multiplication Table23. Convert Decimal to Binary24. Convert Binary to Decimal25. Calculate Electricity Bill

Check Even or Odd in Python

num % 2. Remainder 0 means even. That is the whole trick.

BeginnerBasic Python ProgramsExample 5 of 25
check-even-or-odd.py
1# Program to check if a number is even or odd
2

3num = int(input("Enter an integer: "))
4

5if num % 2 == 0:
6    print(num, "is even")
7else:
8    print(num, "is odd")

Output

Enter an integer: 7
7 is odd

In this one

  • n % 2 == 0 means even
  • don't hide that behind a bare if n % 2

What's going on

Even means divisible by 2. % gives the remainder.

7 % 2 is 1 → odd. 8 % 2 is 0 → even.

Negative numbers: -3 % 2 is 1 in Python, so this still calls it odd. Don't overthink it for now.

People write if num % 2: and skip == 0. That works (1 is truthy) and is harder to read. Keep the == 0.

After this program

If the idea is still fuzzy, read Day 1: Introduction to Python in the Python course. For a short check, try the Python quiz (300 questions). Stay with all 25 basic python programs, or see every topic on Python exercises.

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