Tennis scorer.

tennis.py

#!/usr/bin/env python3

"""Tennis scorer developed during Python Northwest coding meeting Dec 2012.

Given a current score and the winner of the next point, the script
will return the next score.

Usage:  python3 tennis.py <p1_score> <p2_score> <scorer>
Output: <p1_score> <p2_score>

Where <pn_score> is any of 0, 15, 30, 40, ADV, WIN.
And <next_scorer> is any of 1, 2.

Examples:

    $ python3 tennis.py 15 30 1
    30 30

    $ python3 tennis.py 40 ADV 1
    40 40

    $ python3 tennis.py 40 30 1
    WIN 30

"""

import sys


points = ['0', '15', '30', '40', 'WIN']
points_deuce = ['40', 'ADV', 'WIN']


def next_score(p1_score, p2_score, scorer):
    score = [p1_score, p2_score]
    scorer = int(scorer) - 1
    loser = abs(scorer - 1)
    if score < ['40', '40']:
        score[scorer] = points[points.index(score[scorer]) + 1]
    elif score[loser] == '40':
        score[scorer] = points_deuce[points_deuce.index(score[scorer]) + 1]
    else:
        score = ['40', '40']
    return score


if __name__ == '__main__':
    print(' '.join(next_score(*sys.argv[1:])))