#!/usr/bin/python2.7
#Benjamin Schmidt Test 3 Code
# Create a function that returns the mean absolute error percentage, given 2 lists in the following dictionary as input (35 pts)
# Test the function by calling it with the following inputs (15 pts):
dataDict = {'x1':[2,6,3,5,7,9,1,6,9,1,2,5,7,2,9], 'x2':[3,5,2,5,7,3,3,3,8,1,2,5,5,9,1]}
#i guess i should just assume that list 1 is the actual and forcasted
#im also going to assume "n" in the mape equation in the total number of points (lenght of one of the lists)
#funcion(dictionary, key1, key2)
def mape(di2,w,z):
    for key in di2:
        difs=[x - y for (x, y) in zip(di2[w], di2[z])]
        divid=[float(c)/t for c,t in zip(difs, di2[w])]
        sol = 0
        for i in divid:
            sol += i
        sol=abs(sol)
        solved=(100/(len(di2[w])))*sol
    return solved
solution=mape(dataDict,'x1','x2')
print solution