| 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 consists of two uppercase letters followed by three digits. |
| 9 | Names are unique and randomly selected from a pre-generated pool. |
| 10 | """ |
| 11 | |
| 12 | # Class-level set to track all used names across all robot instances |
| 13 | _used_names = set() |
| 14 | |
| 15 | # Class-level list of all possible names |
| 16 | _name_pool = [] |
| 17 | |
| 2 | 18 | def __init__(self): |
| 3 | | pass |
| 4 | | |
| 19 | """ |
| 20 | Initialize a new Robot instance with no name. |
| 21 | The actual name is generated on first access. |
| 22 | """ |
| 23 | self._name = None |
| 24 | |
| 5 | 25 | @property |
| 6 | 26 | def name(self) -> str: |
| 7 | | pass |
| 8 | | |
| 27 | """ |
| 28 | Get the robot's name. If the robot doesn't have a name yet, |
| 29 | assign a random unique name from the pool. |
| 30 | |
| 31 | Returns: |
| 32 | str: The robot's name in format like 'AB123' |
| 33 | |
| 34 | Raises: |
| 35 | RuntimeError: If all possible names are already in use |
| 36 | """ |
| 37 | # Edge Case: Robot has no name yet, need to assign one |
| 38 | if self._name is None: |
| 39 | # Edge Case: All possible names are already used |
| 40 | if len(self._used_names) >= 676000: # 26*26*10*10*10 |
| 41 | raise RuntimeError("No more names available") |
| 42 | |
| 43 | # Generate all possible names if not already done |
| 44 | # Edge Case: Name pool is empty (first robot initialization) |
| 45 | if not self._name_pool: |
| 46 | letters = string.ascii_uppercase |
| 47 | digits = string.digits |
| 48 | self._name_pool = [ |
| 49 | f"{l1}{l2}{d1}{d2}{d3}" |
| 50 | for l1 in letters |
| 51 | for l2 in letters |
| 52 | for d1 in digits |
| 53 | for d2 in digits |
| 54 | for d3 in digits |
| 55 | ] |
| 56 | |
| 57 | # Select a name that's not already used |
| 58 | available_names = list(set(self._name_pool) - self._used_names) |
| 59 | self._name = random.choice(available_names) |
| 60 | self._used_names.add(self._name) |
| 61 | |
| 62 | return self._name |
| 63 | |
| 9 | 64 | def reset(self) -> None: |
| 10 | | pass |
| 65 | """ |
| 66 | Reset the robot to factory settings, wiping its name. |
| 67 | The name is returned to the pool and can be reassigned to other robots. |
| 68 | """ |
| 69 | # Edge Case: Robot has a name that needs to be released back to the pool |
| 70 | if self._name is not None: |
| 71 | self._used_names.discard(self._name) |
| 72 | self._name = None |
| 73 | |
| 74 | # Handled Edge Cases: Robot has no name yet, need to assign one; All possible names are already used; Name pool is empty (first robot initialization); Robot has a name that needs to be released back to the pool |