| 1 | 1 | class BowlingGame: |
| 2 | 2 | def __init__(self): |
| 3 | | pass |
| 4 | | |
| 3 | """ |
| 4 | Initialize a new bowling game. |
| 5 | """ |
| 6 | self.rolls = [] |
| 7 | self.current_roll = 0 |
| 8 | |
| 5 | 9 | def roll(self, pins): |
| 6 | | pass |
| 7 | | |
| 10 | """ |
| 11 | Record a roll in the game. |
| 12 | |
| 13 | Args: |
| 14 | pins (int): Number of pins knocked down in this roll. |
| 15 | |
| 16 | Raises: |
| 17 | ValueError: If the number of pins is invalid. |
| 18 | """ |
| 19 | # Edge Case: Invalid number of pins (negative) |
| 20 | if pins < 0: |
| 21 | raise ValueError("Negative roll is invalid") |
| 22 | |
| 23 | # Edge Case: Invalid number of pins (more than 10) |
| 24 | if pins > 10: |
| 25 | raise ValueError("Pin count exceeds pins on the lane") |
| 26 | |
| 27 | # Edge Case: Game already has 10 frames and no more rolls are allowed |
| 28 | if self.current_roll >= 20 and not self._is_tenth_frame_open(): |
| 29 | raise ValueError("Cannot roll after game is over") |
| 30 | |
| 31 | # Edge Case: Invalid roll in frame (trying to knock down more pins than remaining) |
| 32 | if self.current_roll % 2 == 1: # Second roll in a frame |
| 33 | # Check if this is a valid second roll (not exceeding 10 pins in frame) |
| 34 | if self.current_roll > 0: |
| 35 | first_roll_in_frame = self.rolls[self.current_roll - 1] |
| 36 | if first_roll_in_frame != 10 and first_roll_in_frame + pins > 10: |
| 37 | raise ValueError("Pin count exceeds pins on the lane") |
| 38 | |
| 39 | # Edge Case: Tenth frame special rules |
| 40 | if self.current_roll >= 18: # In the tenth frame |
| 41 | if self.current_roll == 18: # First roll of tenth frame |
| 42 | self.rolls.append(pins) |
| 43 | self.current_roll += 1 |
| 44 | elif self.current_roll == 19: # Second roll of tenth frame |
| 45 | # Check if second roll is valid |
| 46 | if self.rolls[18] == 10: # First was a strike |
| 47 | # Second roll can be anything 0-10 |
| 48 | self.rolls.append(pins) |
| 49 | self.current_roll += 1 |
| 50 | else: # First was not a strike |
| 51 | # Sum of first two rolls cannot exceed 10 |
| 52 | if self.rolls[18] + pins > 10: |
| 53 | raise ValueError("Pin count exceeds pins on the lane") |
| 54 | self.rolls.append(pins) |
| 55 | self.current_roll += 1 |
| 56 | elif self.current_roll == 20: # First fill ball |
| 57 | # Only allowed if previous frame was spare or strike |
| 58 | if self.rolls[18] == 10 or (self.rolls[18] + self.rolls[19] == 10): |
| 59 | self.rolls.append(pins) |
| 60 | self.current_roll += 1 |
| 61 | else: |
| 62 | raise ValueError("Cannot roll after game is over") |
| 63 | elif self.current_roll == 21: # Second fill ball |
| 64 | # Only allowed if first fill ball was a strike or tenth frame was XXX |
| 65 | if self.rolls[18] == 10 and self.rolls[19] == 10: |
| 66 | self.rolls.append(pins) |
| 67 | self.current_roll += 1 |
| 68 | elif self.rolls[18] == 10 and self.rolls[20] == 10: |
| 69 | self.rolls.append(pins) |
| 70 | self.current_roll += 1 |
| 71 | else: |
| 72 | raise ValueError("Cannot roll after game is over") |
| 73 | else: |
| 74 | self.rolls.append(pins) |
| 75 | self.current_roll += 1 |
| 76 | |
| 8 | 77 | def score(self): |
| 9 | | pass |
| 78 | """ |
| 79 | Calculate the total score for the game. |
| 80 | |
| 81 | Returns: |
| 82 | int: The total score of the game. |
| 83 | |
| 84 | Raises: |
| 85 | ValueError: If the game is not yet complete. |
| 86 | """ |
| 87 | # Edge Case: Game is not complete |
| 88 | if not self._is_game_complete(): |
| 89 | raise ValueError("Score cannot be taken until the end of the game") |
| 90 | |
| 91 | total_score = 0 |
| 92 | roll_index = 0 |
| 93 | |
| 94 | for frame in range(10): |
| 95 | if self._is_strike(roll_index): # Strike |
| 96 | total_score += 10 + self._strike_bonus(roll_index) |
| 97 | roll_index += 1 |
| 98 | elif self._is_spare(roll_index): # Spare |
| 99 | total_score += 10 + self._spare_bonus(roll_index) |
| 100 | roll_index += 2 |
| 101 | else: # Open frame |
| 102 | total_score += self.rolls[roll_index] + self.rolls[roll_index + 1] |
| 103 | roll_index += 2 |
| 104 | |
| 105 | return total_score |
| 106 | |
| 107 | def _is_strike(self, roll_index): |
| 108 | """ |
| 109 | Check if a roll is a strike. |
| 110 | |
| 111 | Args: |
| 112 | roll_index (int): Index of the roll to check. |
| 113 | |
| 114 | Returns: |
| 115 | bool: True if the roll is a strike, False otherwise. |
| 116 | """ |
| 117 | return self.rolls[roll_index] == 10 |
| 118 | |
| 119 | def _is_spare(self, roll_index): |
| 120 | """ |
| 121 | Check if a frame is a spare. |
| 122 | |
| 123 | Args: |
| 124 | roll_index (int): Index of the first roll in the frame. |
| 125 | |
| 126 | Returns: |
| 127 | bool: True if the frame is a spare, False otherwise. |
| 128 | """ |
| 129 | return self.rolls[roll_index] + self.rolls[roll_index + 1] == 10 |
| 130 | |
| 131 | def _strike_bonus(self, roll_index): |
| 132 | """ |
| 133 | Calculate the bonus for a strike. |
| 134 | |
| 135 | Args: |
| 136 | roll_index (int): Index of the strike roll. |
| 137 | |
| 138 | Returns: |
| 139 | int: The bonus points for the strike. |
| 140 | """ |
| 141 | return self.rolls[roll_index + 1] + self.rolls[roll_index + 2] |
| 142 | |
| 143 | def _spare_bonus(self, roll_index): |
| 144 | """ |
| 145 | Calculate the bonus for a spare. |
| 146 | |
| 147 | Args: |
| 148 | roll_index (int): Index of the first roll in the spare frame. |
| 149 | |
| 150 | Returns: |
| 151 | int: The bonus points for the spare. |
| 152 | """ |
| 153 | return self.rolls[roll_index + 2] |
| 154 | |
| 155 | def _is_game_complete(self): |
| 156 | """ |
| 157 | Check if the game is complete. |
| 158 | |
| 159 | Returns: |
| 160 | bool: True if the game is complete, False otherwise. |
| 161 | """ |
| 162 | # A game is complete when we have 10 frames worth of rolls, |
| 163 | # plus any necessary fill balls for the tenth frame |
| 164 | if len(self.rolls) < 18: # Less than 9 complete frames |
| 165 | return False |
| 166 | |
| 167 | if len(self.rolls) == 18: # 9 complete frames, need to check 10th |
| 168 | # If 10th frame is open (not strike or spare), game is complete |
| 169 | return self.rolls[18] + self.rolls[19] < 10 |
| 170 | |
| 171 | if len(self.rolls) == 19: # First roll of 10th frame is done |
| 172 | # If first roll was a strike, need one more roll |
| 173 | return self.rolls[18] != 10 |
| 174 | |
| 175 | if len(self.rolls) == 20: # First two rolls of 10th frame are done |
| 176 | # If we had a strike or spare, we need fill balls |
| 177 | return not (self.rolls[18] == 10 or self.rolls[18] + self.rolls[19] == 10) |
| 178 | |
| 179 | if len(self.rolls) == 21: # One fill ball done |
| 180 | # If 10th frame was XXX, we need one more fill ball |
| 181 | return not (self.rolls[18] == 10 and self.rolls[19] == 10) |
| 182 | |
| 183 | # 22 rolls means we had XXX in the 10th frame |
| 184 | return len(self.rolls) == 22 |
| 185 | |
| 186 | def _is_tenth_frame_open(self): |
| 187 | """ |
| 188 | Check if the tenth frame is open (no strike or spare). |
| 189 | |
| 190 | Returns: |
| 191 | bool: True if the tenth frame is open, False otherwise. |
| 192 | """ |
| 193 | if len(self.rolls) < 18: |
| 194 | return False |
| 195 | |
| 196 | if len(self.rolls) >= 20: |
| 197 | # Check if tenth frame is open |
| 198 | return self.rolls[18] + self.rolls[19] < 10 |
| 199 | |
| 200 | return False |
| 201 | |
| 202 | # Handled Edge Cases: Invalid number of pins (negative), Invalid number of pins (more than 10), |
| 203 | # Game already has 10 frames and no more rolls are allowed, Invalid roll in frame (trying to knock down more pins than remaining), |
| 204 | # Tenth frame special rules, Game is not complete |
| 205 | |
| 206 | # Handled Edge Cases: Invalid number of pins (negative), Invalid number of pins (more than 10), |
| 207 | # Game already has 10 frames and no more rolls are allowed, Invalid roll in frame (trying to knock down more pins than remaining), |
| 208 | # Tenth frame special rules |
| 209 | |
| 210 | # Handled Edge Cases: Game is not complete |
| 211 | |
| 212 | # Handled Edge Cases: None (helper method) |
| 213 | |
| 214 | # Handled Edge Cases: None (helper method) |
| 215 | |
| 216 | # Handled Edge Cases: None (helper method) |
| 217 | |
| 218 | # Handled Edge Cases: None (helper method) |
| 219 | |
| 220 | # Handled Edge Cases: Game not complete with less than 18 rolls, Game complete with exactly 18 rolls and open 10th frame, |
| 221 | # Game complete with 19 rolls and first roll of 10th frame is not strike, Game complete with 20 rolls and 10th frame is open, |
| 222 | # Game complete with 21 rolls and 10th frame is not XXX, Game complete with 22 rolls (XXX in 10th frame) |
| 223 | |
| 224 | # Handled Edge Cases: Tenth frame is not complete with less than 18 rolls, Tenth frame status with 20 rolls, |
| 225 | # Tenth frame is open with sufficient rolls |