Find the percentage difference between two numbers

percent_diff.py

#!/bin/env python3

def main():
    num1 = 80
    num2 = 100

    absolute = abs(num1 - num2)
    average = (num1 + num2) / 2
    answer = round((absolute / average) * 100)

    print(f"Difference of {answer}%")

if __name__ == "__main__":
    main()