| 1 | import random |
| 2 | import string |
| 3 | |
| 1 | 4 | class Robot: |
| 5 | """ |
| 6 | A class representing a robot with a randomly assigned name. |
| 7 | |
| 8 | The robot's name is generated in the format of two uppercase letters followed by three digits. |
| 9 | Names are unique and randomly assigned from a pre-generated pool. |
| 10 | """ |
| 11 | |
| 12 | # Class-level name pool and used names tracking |
| 13 | _name_pool = [] |
| 14 | _used_names = set() |
| 15 | |
| 2 | 16 | def __init__(self): |
| 3 | | pass |
| 4 | | |
| 17 | """ |
| 18 | Initialize a Robot instance. |
| 19 | |
| 20 | The robot starts with no name assigned. A name will be generated when first accessed. |
| 21 | """ |
| 22 | self._name = None |
| 23 | # Generate name pool if not already done |
| 24 | if not Robot._name_pool: |
| 25 | self._generate_name_pool() |
| 26 | |
| 5 | 27 | @property |
| 6 | 28 | def name(self) -> str: |
| 7 | | pass |
| 8 | | |
| 29 | """ |
| 30 | Get the robot's name. |
| 31 | |
| 32 | If the robot doesn't have a name yet, assign one randomly from the available pool. |
| 33 | |
| 34 | Returns: |
| 35 | str: The robot's name in format AA000. |
| 36 | """ |
| 37 | if self._name is None: |
| 38 | # Edge Case: No names available in pool |
| 39 | if not Robot._name_pool: |
| 40 | raise RuntimeError("No more names available for robots") |
| 41 | |
| 42 | # Assign a name from the pool |
| 43 | self._name = Robot._name_pool.pop() |
| 44 | Robot._used_names.add(self._name) |
| 45 | return self._name |
| 46 | |
| 9 | 47 | def reset(self) -> None: |
| 10 | | pass |
| 48 | """ |
| 49 | Reset the robot to factory settings. |
| 50 | |
| 51 | This wipes the robot's current name and makes it available for reuse. |
| 52 | """ |
| 53 | # Edge Case: Robot has no name to reset |
| 54 | if self._name is not None: |
| 55 | # Return the name to the pool for potential reuse |
| 56 | Robot._used_names.remove(self._name) |
| 57 | Robot._name_pool.append(self._name) |
| 58 | # Shuffle to maintain randomness |
| 59 | random.shuffle(Robot._name_pool) |
| 60 | self._name = None |
| 61 | |
| 62 | @classmethod |
| 63 | def _generate_name_pool(cls): |
| 64 | """ |
| 65 | Generate all possible valid robot names and shuffle them randomly. |
| 66 | |
| 67 | This method is called once to create the pool of all possible names. |
| 68 | """ |
| 69 | # Edge Case: Prevent multiple generations |
| 70 | if cls._name_pool: |
| 71 | return |
| 72 | |
| 73 | letters = string.ascii_uppercase |
| 74 | digits = string.digits |
| 75 | |
| 76 | # Generate all possible combinations: AA000 to ZZ999 |
| 77 | for first_letter in letters: |
| 78 | for second_letter in letters: |
| 79 | for digit1 in digits: |
| 80 | for digit2 in digits: |
| 81 | for digit3 in digits: |
| 82 | name = f"{first_letter}{second_letter}{digit1}{digit2}{digit3}" |
| 83 | cls._name_pool.append(name) |
| 84 | |
| 85 | # Shuffle the pool to ensure randomness |
| 86 | random.shuffle(cls._name_pool) |
| 87 | |
| 88 | # Handled Edge Cases: No names available in pool, Robot has no name to reset, Prevent multiple generations |