Sum Square Difference

import time
time.process_time()

def sumofsquares(n):
    sum = 0
    for i in range(n + 1):
        sum += i**2
    return sum
        
def squareofsum(n):
    if n % 2 == 0:
        sum = (1 + n) * n/2
    else:
        sum = (1 + n) * (n//2) + (1 + n)/2
    square = sum**2
    return square

def sumsquarediff(n):
    diff = squareofsum(n) - sumofsquares(n)
    return diff

print(sumsquarediff(100))

print("\n", time.process_time(), "seconds")