| 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 | Each robot has a unique name, and the name can be reset to a new random one. |
| 10 | """ |
| 11 | |
| 12 | # Class-level name pool to ensure uniqueness across all robot instances |
| 13 | _name_pool = [] |
| 14 | _used_names = set() |
| 15 | |
| 2 | 16 | def __init__(self): |
| 3 | | pass |
| 4 | | |
| 17 | """ |
| 18 | Initialize a new Robot instance with no name. |
| 19 | The actual name is generated when first accessed. |
| 20 | """ |
| 21 | self._name = None |
| 22 | |
| 5 | 23 | @property |
| 6 | 24 | def name(self) -> str: |
| 7 | | pass |
| 8 | | |
| 25 | """ |
| 26 | Get the robot's name. If the robot doesn't have a name yet, generate one. |
| 27 | |
| 28 | Returns: |
| 29 | str: The robot's name in format AA000 |
| 30 | """ |
| 31 | # Edge Case: Robot has no name yet - generate one |
| 32 | if self._name is None: |
| 33 | # Edge Case: Name pool is empty or exhausted - this should not happen with the pre-generated approach |
| 34 | if not Robot._name_pool: |
| 35 | Robot._generate_name_pool() |
| 36 | |
| 37 | # Edge Case: All possible names are used - this should not happen in normal operation |
| 38 | if not Robot._name_pool: |
| 39 | raise RuntimeError("All possible robot names have been used.") |
| 40 | |
| 41 | self._name = Robot._name_pool.pop() |
| 42 | Robot._used_names.add(self._name) |
| 43 | |
| 44 | return self._name |
| 45 | |
| 9 | 46 | def reset(self) -> None: |
| 10 | | pass |
| 47 | """ |
| 48 | Reset the robot to factory settings, wiping its name. |
| 49 | The next time the name is accessed, a new random name will be generated. |
| 50 | """ |
| 51 | # Edge Case: Robot has a name that needs to be returned to the pool |
| 52 | if self._name is not None: |
| 53 | # Remove from used names but don't put it back in the pool to maintain uniqueness |
| 54 | # as per the requirement that every robot ever created should have a unique name |
| 55 | Robot._used_names.discard(self._name) |
| 56 | self._name = None |
| 57 | |
| 58 | @classmethod |
| 59 | def _generate_name_pool(cls): |
| 60 | """ |
| 61 | Generate all possible valid robot names, shuffle them randomly, and store them in the pool. |
| 62 | """ |
| 63 | # Edge Case: Prevent regenerating the pool if it already exists |
| 64 | if cls._name_pool: |
| 65 | return |
| 66 | |
| 67 | names = [] |
| 68 | # Generate all possible combinations of 2 letters and 3 digits |
| 69 | for first_letter in string.ascii_uppercase: |
| 70 | for second_letter in string.ascii_uppercase: |
| 71 | for digit1 in string.digits: |
| 72 | for digit2 in string.digits: |
| 73 | for digit3 in string.digits: |
| 74 | name = f"{first_letter}{second_letter}{digit1}{digit2}{digit3}" |
| 75 | # Edge Case: Only add names that haven't been used yet |
| 76 | if name not in cls._used_names: |
| 77 | names.append(name) |
| 78 | |
| 79 | # Shuffle the names randomly |
| 80 | random.shuffle(names) |
| 81 | cls._name_pool = names |
| 82 | |
| 83 | # Handled Edge Cases: Robot has no name yet, Name pool is empty or exhausted, All possible names are used, Robot has a name that needs to be returned to the pool, Prevent regenerating the pool if it already exists, Only add names that haven't been used yet |