This is simple script to calculate Elo rating

elo.py

import math

def elo(ra, rb, sa, sb, ka, kb):
    '''
    you can find the description here https://safoyeth.com/2017/03/04/chessscripts/
    ra/rb - current rating. Python 2.x note - values must be float
    sa/sb - result (1 for win, 1/2 for draw, 0 for lose)
    ka/kb = 10 if ra/rb >= 2400
    ka/kb = 20 if ra/rb < 2400
    ka/kb = 40 if gamesPlayed < 30 or (age < 18 and ra/rb < 2300)
    '''
    ea = 1/(1 + math.pow(10, (rb - ra)/400))
    eb = 1/(1 + math.pow(10, (ra - rb)/400))
    raNew = round((ra + ka * (sa - ea)), 2)
    rbNew = round((rb + kb * (sb - eb)), 2)
    return raNew, rbNew