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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

Find Absolute Value in Python

If it's negative, flip the sign. abs() exists; this is the if version.

BeginnerBasic Python ProgramsExample 18 of 25
find-absolute-value.py
1# Program to find the absolute value of a number
2

3num = float(input("Enter a number: "))
4

5if num < 0:
6    abs_value = -num
7else:
8    abs_value = num
9

10print("Absolute value of", num, "is", abs_value)

Output

Enter a number: -7
Absolute value of -7.0 is 7.0

In this one

  • if n < 0: n = -n
  • abs() is the same thing, shorter

What's going on

Distance from zero. Negative → multiply by -1. Otherwise leave it.

abs(-7) is the builtin. This page writes the if so you see there is no magic.

-0.0 is a weird float. Python still prints it as absolute 0.0 here. Don't chase that.

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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