| 1 | import random |
| 2 | import string |
| 3 | |
| 1 | 4 | class Robot: |
| 5 | """ |
| 6 | A class representing a robot with a randomly generated name. |
| 7 | |
| 8 | The robot's name consists of two uppercase letters followed by three digits. |
| 9 | The name is generated upon first access and can be reset to a new random name. |
| 10 | All names are guaranteed to be unique across all robot instances. |
| 11 | """ |
| 12 | |
| 13 | # Class-level set to track all used names |
| 14 | _used_names = set() |
| 15 | |
| 16 | # Pre-generate all possible valid names |
| 17 | _all_names = [ |
| 18 | f"{letter1}{letter2}{digit1:03d}" |
| 19 | for letter1 in string.ascii_uppercase |
| 20 | for letter2 in string.ascii_uppercase |
| 21 | for digit1 in range(1000) |
| 22 | ] |
| 23 | |
| 24 | # Shuffle the names to ensure randomness |
| 25 | random.shuffle(_all_names) |
| 26 | |
| 27 | # Class-level iterator for the name pool |
| 28 | _name_pool = iter(_all_names) |
| 29 | |
| 2 | 30 | def __init__(self): |
| 3 | | pass |
| 4 | | |
| 31 | """ |
| 32 | Initialize a new Robot instance with no name. |
| 33 | The name will be generated on first access. |
| 34 | """ |
| 35 | self._name = None |
| 36 | |
| 5 | 37 | @property |
| 6 | 38 | def name(self) -> str: |
| 7 | | pass |
| 8 | | |
| 39 | """ |
| 40 | Get the robot's name. |
| 41 | |
| 42 | If the robot doesn't have a name yet, generate one from the pool. |
| 43 | |
| 44 | Returns: |
| 45 | str: The robot's name in format AA000. |
| 46 | |
| 47 | Raises: |
| 48 | RuntimeError: If all possible names have been used. |
| 49 | """ |
| 50 | # Edge Case: Robot already has a name |
| 51 | if self._name is not None: |
| 52 | return self._name |
| 53 | |
| 54 | # Edge Case: All possible names have been used |
| 55 | try: |
| 56 | new_name = next(self._name_pool) |
| 57 | self._used_names.add(new_name) |
| 58 | self._name = new_name |
| 59 | return self._name |
| 60 | except StopIteration: |
| 61 | raise RuntimeError("No more unique names available") |
| 62 | |
| 9 | 63 | def reset(self) -> None: |
| 10 | | pass |
| 64 | """ |
| 65 | Reset the robot to factory settings, wiping its name. |
| 66 | |
| 67 | The old name is returned to the pool of available names. |
| 68 | The next access to the name property will generate a new name. |
| 69 | """ |
| 70 | # Edge Case: Robot has no name to reset |
| 71 | if self._name is not None: |
| 72 | self._used_names.discard(self._name) |
| 73 | self._name = None |
| 74 | |
| 75 | # Handled Edge Cases: Robot already has a name, all possible names have been used, robot has no name to reset |