如何用Python编写下注结算函数

Question

我正在尝试编写一个函数，它接受体育赌注并返回其净结果

虽然我在总赌注上成功地完成了它，但我无法完成对残障的下注，因为它导致了一些嵌套的if/else语句的巨大墙

如果您不熟悉博彩，那么一个详尽的测试套件应该有助于理解程序应该做什么

主要问题是如何解决这个问题，而不是列举所有可能的案例

非常感谢您的反馈

SUPPORTED_BET_TYPES = ['total', 'handicap']
SIDES = ['home', 'away', 'over', 'under']
BET_OUTCOMES = ['Won', 'Lost', 'Cancelled', 'Half Won', 'Half Lost']


def settle_bet(bet_type, side, points, price, bet_amount, home_score, away_score):
    '''Returns a result of the bet'''

    if bet_type == 'total':
        return settle_total_bet(side, points, price, bet_amount, home_score, away_score)
    elif bet_type == 'handicap':
        return settle_handicap_bet(side, points, price, bet_amount, home_score, away_score)


def settle_total_bet(side, points, price, bet_amount, home_score, away_score):
    '''Returns Net result of the bet on total'''

    outcome = determine_total_bet_outcome(side, points, home_score, away_score)

    if outcome == 'Won':
        return bet_amount * (price - 1)
    elif outcome == 'Half Won':
        return bet_amount * ((price - 1) / 2)
    elif outcome == 'Cancelled':
        return 0
    elif outcome == 'Half Lost':
        return bet_amount * (-1 / 2)
    else:
        return bet_amount * -1


def determine_total_bet_outcome(side, points, home_score, away_score):
    '''Returns the appropriate outcome of the bet from BET_OUTCOMES'''

    total_score = home_score + away_score
    points_score_diff = points - total_score

    if points_score_diff == 0:
        return 'Cancelled'
    elif points_score_diff == 0.25:
        if side == 'over':
            return 'Half Lost'
        else:
            return 'Half Won'
    elif points_score_diff == -0.25:
        if side == 'over':
            return 'Half Won'
        else:
            return 'Half Lost'
    elif points_score_diff >= 0.5:
        if side == 'over':
            return 'Lost'
        else:
            return 'Won'
    elif points_score_diff <= -0.5:
        if side == 'over':
            return 'Won'
        else:
            return 'Lost'


def test():
    # Bets on Total

    # Won or Lost
    assert settle_bet('total', 'over', 2.5, 1.90, 100, 3, 2) == 100 * (1.90 - 1)
    assert settle_bet('total', 'over', 3.5, 1.85, 100, 0, 1) == 100 * -1
    assert settle_bet('total', 'under', 2.5, 1.94, 100, 0, 0) == 100 * (1.94 - 1)
    assert settle_bet('total', 'under', 3.5, 1.75, 100, 1, 3) == 100 * -1

    # Won or Lost Or Cancelled
    assert settle_bet('total', 'over', 3.0, 1.82, 100, 2, 2) == 100 * (1.82 - 1)
    assert settle_bet('total', 'over', 3.0, 1.82, 100, 1, 2) == 100 * 0
    assert settle_bet('total', 'over', 3.0, 1.82, 100, 0, 0) == 100 * -1

    assert settle_bet('total', 'under', 3.0, 1.82, 100, 2, 2) == 100 * -1
    assert settle_bet('total', 'under', 3.0, 1.82, 100, 1, 2) == 100 * 0
    assert settle_bet('total', 'under', 3.0, 1.82, 100, 0, 0) == 100 * (1.82 - 1)

    # Won or Lost or Half Won or Half Lost
    assert settle_bet('total', 'over', 2.25, 1.95, 100, 2, 1) == 100 * (1.95 - 1)
    assert settle_bet('total', 'over', 2.25, 1.90, 100, 0, 0) == 100 * -1
    assert settle_bet('total', 'over', 2.25, 1.80, 100, 1, 1) == 100 * (-1 / 2)

    assert settle_bet('total', 'under', 2.25, 1.95, 100, 2, 1) == 100 * -1
    assert settle_bet('total', 'under', 2.25, 1.90, 100, 0, 0) == 100 * (1.90 - 1)
    assert settle_bet('total', 'under', 2.25, 1.80, 100, 1, 1) == 100 * ((1.80 - 1) / 2)

    assert settle_bet('total', 'over', 2.75, 1.90, 100, 3, 3) == 100 * (1.90 - 1)
    assert settle_bet('total', 'over', 2.75, 1.88, 100, 1, 2) == 100 * ((1.88 - 1) / 2)
    assert settle_bet('total', 'over', 2.75, 1.90, 100, 1, 0) == 100 * -1

    assert settle_bet('total', 'under', 2.75, 1.90, 100, 3, 3) == 100 * -1
    assert settle_bet('total', 'under', 2.75, 1.88, 100, 1, 2) == 100 * (-1 / 2)
    assert settle_bet('total', 'under', 2.75, 1.90, 100, 1, 0) == 100 * (1.90 - 1)

    # Bets on Handicap

    # Won or Lost

    # assert settle_bet('handicap', 'home', -0.5, 1.88, 100, 4, 0) == 100 * (1.88 - 1)
    # assert settle_bet('handicap', 'home', -0.5, 1.88, 100, 0, 0) == 100 * -1
    # assert settle_bet('handicap', 'home', -0.5, 1.88, 100, 1, 2) == 100 * -1
    #
    # assert settle_bet('handicap', 'away', -0.5, 1.88, 100, 4, 0) == 100 * -1
    # assert settle_bet('handicap', 'away', -0.5, 1.88, 100, 0, 0) == 100 * -1
    # assert settle_bet('handicap', 'away', -0.5, 1.88, 100, 1, 2) == 100 * (1.88 - 1)
    #
    # # Won or Lost Or Cancelled
    # assert settle_bet('handicap', 'home', 0.0, 1.90, 100, 1, 0) == 100 * (1.90 - 1)
    # assert settle_bet('handicap', 'home', 0.0, 1.85, 100, 2, 2) == 100 * 0
    # assert settle_bet('handicap', 'home', 0.0, 1.97, 100, 1, 3) == 100 * -1
    #
    # assert settle_bet('handicap', 'away', 0.0, 1.90, 100, 1, 0) == 100 * -1
    # assert settle_bet('handicap', 'away', 0.0, 1.85, 100, 2, 2) == 100 * 0
    # assert settle_bet('handicap', 'away', 0.0, 1.97, 100, 1, 3) == 100 * (1.97 - 1)
    #
    # # Won or Lost or Half Won or Half Lost
    #
    # assert settle_bet('handicap', 'home', -0.25, 1.84, 100, 1, 0) == 100 * (1.84 - 1)
    # assert settle_bet('handicap', 'home', -0.25, 1.84, 100, 2, 2) == 100 * (-1 / 2)
    # assert settle_bet('handicap', 'home', -0.25, 1.84, 100, 1, 3) == 100 * -1
    #
    # assert settle_bet('handicap', 'home', 1.25, 1.96, 100, 3, 2) == 100 * (1.96 - 1)
    # assert settle_bet('handicap', 'home', 1.25, 1.96, 100, 1, 1) == 100 * (1.96 - 1)
    # assert settle_bet('handicap', 'home', 1.25, 1.96, 100, 1, 2) == 100 * ((1.96 - 1) / 2)
    # assert settle_bet('handicap', 'home', 1.25, 1.96, 100, 0, 2) == 100 * -1
    #
    # assert settle_bet('handicap', 'away', -1.25, 1.86, 100, 0, 2) == 100 * (1.86 - 1)
    # assert settle_bet('handicap', 'away', -1.25, 1.86, 100, 1, 2) == 100 * (-1 / 2)
    # assert settle_bet('handicap', 'away', -1.25, 1.86, 100, 0, 0) == 100 * -1
    # assert settle_bet('handicap', 'away', -1.25, 1.86, 100, 3, 0) == 100 * -1
    #
    # assert settle_bet('handicap', 'away', 0.25, 1.97, 100, 1, 0) == 100 * -1
    # assert settle_bet('handicap', 'away', 0.25, 1.97, 100, 2, 2) == 100 * ((1.97 - 1) / 2)
    # assert settle_bet('handicap', 'away', 0.25, 1.97, 100, 1, 4) == 100 * (1.97 - 1)
    #
    # assert settle_bet('handicap', 'home', -0.75, 1.90, 100, 4, 0) == 100 * (1.90 - 1)
    # assert settle_bet('handicap', 'home', -0.75, 1.90, 100, 3, 2) == 100 * ((1.90 - 1) / 2)
    # assert settle_bet('handicap', 'home', -0.75, 1.90, 100, 1, 1) == 100 * -1
    # assert settle_bet('handicap', 'home', -0.75, 1.90, 100, 0, 2) == 100 * -1
    #
    # assert settle_bet('handicap', 'home', 1.75, 1.88, 100, 0, 3) == 100 * (1.88 - 1)
    # assert settle_bet('handicap', 'home', 1.75, 1.88, 100, 2, 4) == 100 * (-1 / 2)
    # assert settle_bet('handicap', 'home', 1.75, 1.88, 100, 1, 1) == 100 * (1.88 - 1)
    # assert settle_bet('handicap', 'home', 1.75, 1.88, 100, 1, 0) == 100 * (1.88 - 1)
    #
    # assert settle_bet('handicap', 'away', -2.75, 1.92, 100, 0, 4) == 100 * (1.92 - 1)
    # assert settle_bet('handicap', 'away', -2.75, 1.92, 100, 1, 4) == 100 * ((1.92 - 1) / 2)
    # assert settle_bet('handicap', 'away', -2.75, 1.92, 100, 2, 3) == 100 * -1
    # assert settle_bet('handicap', 'away', -2.75, 1.92, 100, 1, 1) == 100 * -1
    # assert settle_bet('handicap', 'away', -2.75, 1.92, 100, 1, 0) == 100 * -1
    #
    # assert settle_bet('handicap', 'away', 0.75, 1.91, 100, 1, 2) == 100 * (1.91 - 1)
    # assert settle_bet('handicap', 'away', 0.75, 1.91, 100, 0, 0) == 100 * ((1.91 - 1) / 2)
    # assert settle_bet('handicap', 'away', 0.75, 1.91, 100, 3, 2) == 100 * -1

    print("All tests passed.")


if __name__ == '__main__':
    test()

Answer 1

一些想法：

1. 与其返回表示下注结果的字符串，不如返回表示下注结果乘数的数字

2. 不要单独检查下注是“超过”还是“低于”与每个分数差，而是使用下注类型将分数差标准化为对投注者有利的金额

3. 使用条件表达式

因此：

def settle_total_bet(side, points, price, bet_amount, home_score, away_score):
    '''Returns Net result of the bet on total'''
    outcome = determine_total_bet_outcome(side, points, home_score, away_score)
    bet_size = (price - 1) if outcome > 0 else 1
    return bet_amount * bet_size * outcome


def determine_total_bet_outcome(side, line, home_score, away_score):
    '''Returns the appropriate outcome of the bet from BET_OUTCOMES'''
    amount_over = home_score + away_score - line
    amount_successful = amount_over if side == 'over' else -amount_over

    if amount_successful >= 0.5:
        return 1
    elif amount_successful <= -0.5:
        return -1
    elif amount_successful > 0: # == 0.25
        return 0.5
    elif amount_successful < 0: # == -0.25
        return -0.5
    else:
        return 0

顺便说一句：您程序顶部的列表现在并没有真正起到任何作用。但是，如果您想对这个想法采取更严格的方法—使用有限值集中的一个来表示某些数据—请使用标准库enum模块