rolling-average.py

import itertools
import math

items = [10, 3, 4, 10]

steps = 10

def make(a, b):
	print(a, b)
	result = []
	for i in range(steps):
		result.append(math.sqrt(
			(((a ** 2) * (steps - i - 1))) + 
			(((b ** 2) * i))
		) / steps)
	return result

result = [make(x, y) for x,y in zip(items,items[1:])]

print(result)

print(list(itertools.chain.from_iterable(result)))