| 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 set to keep track of all names that have been assigned |
| 13 | _used_names = set() |
| 14 | |
| 15 | # Pre-generate all possible names and shuffle them |
| 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 | generate one randomly from the available pool. |
| 30 | |
| 31 | Returns: |
| 32 | str: The robot's name in format like 'RX837' |
| 33 | """ |
| 34 | # Edge Case: Robot has no name yet, need to assign one |
| 35 | if self._name is None: |
| 36 | # Edge Case: All possible names have been used |
| 37 | if len(self._used_names) >= 26*26*1000: # 676000 possible names |
| 38 | raise RuntimeError("No more unique names available") |
| 39 | |
| 40 | # Generate a new unique name |
| 41 | while True: |
| 42 | # Generate random name: two letters + three digits |
| 43 | letters = ''.join(random.choices(string.ascii_uppercase, k=2)) |
| 44 | digits = ''.join(random.choices(string.digits, k=3)) |
| 45 | new_name = letters + digits |
| 46 | |
| 47 | # Edge Case: Generated name is already in use, try again |
| 48 | if new_name not in self._used_names: |
| 49 | self._name = new_name |
| 50 | self._used_names.add(new_name) |
| 51 | break |
| 52 | |
| 53 | return self._name |
| 54 | |
| 9 | 55 | def reset(self) -> None: |
| 10 | | pass |
| 56 | """ |
| 57 | Reset the robot to factory settings, wiping its name. |
| 58 | The next time the name is accessed, a new random name will be generated. |
| 59 | """ |
| 60 | # Edge Case: Robot has a name that needs to be freed for reuse |
| 61 | if self._name is not None: |
| 62 | self._used_names.discard(self._name) |
| 63 | self._name = None |
| 64 | |
| 65 | # Handled Edge Cases: Robot has no name yet, need to assign one; All possible names have been used; Generated name is already in use, try again; Robot has a name that needs to be freed for reuse |
| 66 | |
| 67 | # Handled Edge Cases: Robot has no name yet, need to assign one; All possible names have been used; Generated name is already in use, try again; Robot has a name that needs to be freed for reuse |