| 1 | import random |
| 2 | import string |
| 3 | import time |
| 4 | |
| 1 | 5 | class Robot: |
| 6 | """ |
| 7 | A class representing a robot with a randomly generated name. |
| 8 | |
| 9 | The robot's name consists of two uppercase letters followed by three digits. |
| 10 | Names are unique and randomly generated upon first access or after a reset. |
| 11 | """ |
| 12 | |
| 13 | # Class-level set to track all generated names for uniqueness |
| 14 | _used_names = set() |
| 15 | |
| 2 | 16 | def __init__(self): |
| 3 | | pass |
| 4 | | |
| 17 | """ |
| 18 | Initialize a Robot instance with no name. |
| 19 | The name will be 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, |
| 27 | generate a unique random name in the format of two uppercase letters |
| 28 | followed by three digits. |
| 29 | |
| 30 | Returns: |
| 31 | str: The robot's unique name |
| 32 | """ |
| 33 | # Edge Case: Robot has no name yet - generate a new one |
| 34 | if self._name is None: |
| 35 | self._generate_unique_name() |
| 36 | return self._name |
| 37 | |
| 9 | 38 | def reset(self) -> None: |
| 10 | | pass |
| 39 | """ |
| 40 | Reset the robot to factory settings by wiping its name. |
| 41 | The next access to the name property will generate a new unique name. |
| 42 | """ |
| 43 | # Edge Case: Robot has a name that needs to be removed from the used set |
| 44 | if self._name is not None: |
| 45 | Robot._used_names.discard(self._name) |
| 46 | self._name = None |
| 47 | |
| 48 | def _generate_unique_name(self) -> None: |
| 49 | """ |
| 50 | Generate a unique name for the robot and store it. |
| 51 | |
| 52 | The name format is two uppercase letters followed by three digits. |
| 53 | This method ensures uniqueness by checking against all previously |
| 54 | generated names. |
| 55 | """ |
| 56 | # Edge Case: Handle potential name collision through retries |
| 57 | max_attempts = 1000 # Prevent infinite loop in case of issues |
| 58 | for _ in range(max_attempts): |
| 59 | # Generate two random uppercase letters |
| 60 | letters = ''.join(random.choices(string.ascii_uppercase, k=2)) |
| 61 | |
| 62 | # Generate three random digits |
| 63 | digits = ''.join(random.choices(string.digits, k=3)) |
| 64 | |
| 65 | # Combine to form the name |
| 66 | new_name = letters + digits |
| 67 | |
| 68 | # Check if this name is unique |
| 69 | if new_name not in Robot._used_names: |
| 70 | Robot._used_names.add(new_name) |
| 71 | self._name = new_name |
| 72 | return |
| 73 | |
| 74 | # Edge Case: Exceeded maximum attempts to generate unique name |
| 75 | # This should practically never happen given the large name space (26*26*10*10*10 = 676,000 possible names) |
| 76 | raise RuntimeError("Unable to generate a unique name after maximum attempts") |
| 77 | |
| 78 | # Handled Edge Cases: Robot has no name yet, Robot has a name that needs to be removed from the used set, Handle potential name collision through retries, Exceeded maximum attempts to generate unique name |