def test_elo() -> None:
assert elo.expected(elo.STARTING_ELO, elo.STARTING_ELO) == 0.5
assert elo.expected(10000, 1) > 0.99
assert elo.expected(1, 10000) < 0.01
assert elo.adjustment(elo.STARTING_ELO,
elo.STARTING_ELO) == elo.K_FACTOR / 2
assert elo.adjustment(10000, 1) == 1
assert elo.adjustment(1, 10000) == elo.K_FACTOR
def adjust(winner: str, loser: str) -> None:
winner_elo = get_elo(winner)
loser_elo = get_elo(loser)
change = elo.adjustment(winner_elo, loser_elo)
PEOPLE[winner] = winner_elo + change
PEOPLE[loser] = loser_elo - change
def adjust(winner: str, loser: str) -> None:
change = elo.adjustment(get_elo(winner), get_elo(loser))
PEOPLE[winner] = get_elo(winner) + change
PEOPLE[loser] = get_elo(loser) - change