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Scoring a Bowling Game

Task

Complete the Bowling Game Kata in contemporary python of the year 2026.

Requirements

  • There are ten pins in a bowling game. Players throw bowling balls to the pins to knock as much of them as possible.
  • Take "write a program..." as "write a bowling score function..."
  • The bowling score function, that must be called with a finished bowling line of a player, then calculates the total line score of that player.
  • The bowling line must be a string of characters containing all ten frames, plus possibly up to two extra frames, separated by whitespace.
  • Each frame must be composed of one or two symbols, one for each ball.
  • If a ball has not knocked down any pins, this is represented by a dash (-).
  • The number of pins knocked down by the ball is represented as a singel digit, otherwise.
  • If the second ball of a frame knocks down all remaining pins, this is represented by a slash (/). A frame with a slash for the second ball is called a strike.
  • If the first ball of a frame alsredy nocked down all ten pins at once, this is represented by a single "X", and then the frame is finished. Such a single ball frame is called a strike.
  • A normal frame with less than ten pins knocked counts as the number of knocked-down pins from both balls together.
  • A spare is scored as 10 points, plus the result of the next ball.
  • A strike is scored as 10 points, plus the results of the next two balls.
  • If the last frame of a line results in a spare, one extra ball must be thrown and then gets added to the last frame's score.
  • If the last frame of a line results in a strike, two extra balls must be thrown and then get added to the last frame's score.
  • A spare always counts the number of pins knocked down after the first ball, and 10 after the second ball.
  • A strike always counts 10 per ball.

Non-Requirements

  • Do not check for valid rolls.
  • Do not check for correct number of rolls and frames.
  • Do not provide scores for intermediate frames.
  • It is assumed that all checking shall be done by the caller.
  • The bowling score is not defined for malformed inputs.

Line Examples

  • "-- -- -- -- -- -- -- -- -- --", a line of gutters, score 0
  • "X X X X X X X X X X X X", a perfect game of all strikes, score 300
  • "5/ 5/ 5/ 5/ 5/ 5/ 5/ 5/ 5/ 5/ 5", all spares, score 150
  • "9- 9- 9- 9- 9- 9- 9- 9- 9- 9-", normal line with misses, score 90
  • "12 12 12 12 12 12 12 12 12 12", normal line, no misses, score 30

Scoring Examples

  • A frame where both balls are misses: "--", score 0 (also called a "gutter game")
  • A spare followed by another spare: "5/ 2/", first frame scores 12
  • A spare followed by a strike: "7/ X", first frame scores 20
  • A strike followed by a spare: "X 5/", first frame scores 20
  • A normal frame: "71", score 8
  • A strike followed by a normal frame: "X 52", first frame scores 17
  • A strike followed by two strikes: "X X X", first frame scores 30
  • A line with alternating strikes and spares only, score 200 (sometimes called a "Dutch 200")
  • A line with all strikes (meaning ten strikes, and both extra balls are strikes as well), score 300