baseball.py

#!/usr/bin/env python


class Game:
    def __init__(self, balls):
        self.balls = list(balls)
        self.cnt_strike = 0
        self.cnt_ball = 0
        self.cnt_out = 0

    def start(self):
        for b in self.balls:
            self.play(b)

            if self.is_out():
                self.count_out()
                self.next_box()

            if self.is_four_ball():
                self.next_box()

            if self.is_three_out():
                self.next_inning()

    def play(self, ball):
        if ball == 'B':
            self.cnt_ball += 1
        elif ball == 'S':
            self.cnt_strike += 1

    def is_out(self):
        return self.cnt_strike == 3

    def is_four_ball(self):
        return self.cnt_ball == 4

    def is_three_out(self):
        return self.cnt_out == 3

    def count_out(self):
        self.cnt_out += 1

    def next_box(self):
        self.cnt_strike = 0
        self.cnt_ball = 0

    def next_inning(self):
        self.cnt_strike = 0
        self.cnt_ball = 0
        self.cnt_out = 0


if __name__ == "__main__":
    balls = "BBSSSBSBSSS"
    g = Game(balls)
    g.start()
    print("s:{} b:{} o:{}".format(g.cnt_strike, g.cnt_ball, g.cnt_out))