Percentage Difference Calculator

pct-diff-calc.py

#!/usr/bin/env python
# Implementation of http://www.calculatorsoup.com/calculators/algebra/percent-difference-calculator.php

v1=5067
v2=5733

def diff(v1, v2):
    f1, f2 = float(v1), float(v2)
    v = 1 - ((f1 - f2) / ((f1 + f2) / 2) * 100) - 1
    return v

print diff(v1, v2)