| 1 | import random |
| 2 | import string |
| 3 | |
| 1 | 4 | class Robot: |
| 5 | # Class variable to store all used names |
| 6 | _used_names = set() |
| 7 | |
| 2 | 8 | def __init__(self): |
| 3 | | pass |
| 4 | | |
| 9 | """ |
| 10 | Initialize a Robot with no name. |
| 11 | """ |
| 12 | self._name = None |
| 13 | |
| 5 | 14 | @property |
| 6 | 15 | def name(self) -> str: |
| 7 | | pass |
| 8 | | |
| 16 | """ |
| 17 | Get the robot's name. If the robot doesn't have a name yet, |
| 18 | generate a new unique random name in the format of two uppercase |
| 19 | letters followed by three digits. |
| 20 | |
| 21 | Returns: |
| 22 | str: The robot's name |
| 23 | """ |
| 24 | # Edge Case: Robot has no name assigned yet |
| 25 | if self._name is None: |
| 26 | self._generate_unique_name() |
| 27 | return self._name |
| 28 | |
| 9 | 29 | def reset(self) -> None: |
| 10 | | pass |
| 30 | """ |
| 31 | Reset the robot to its factory settings, which means that its name gets wiped. |
| 32 | The next time you ask, that robot will respond with a new random name. |
| 33 | """ |
| 34 | # Edge Case: Resetting a robot that has a name - remove old name from used names |
| 35 | if self._name is not None: |
| 36 | Robot._used_names.discard(self._name) |
| 37 | self._name = None |
| 38 | |
| 39 | def _generate_unique_name(self) -> None: |
| 40 | """ |
| 41 | Generate a unique random name in the format of two uppercase letters |
| 42 | followed by three digits. Ensures the name is not already in use. |
| 43 | """ |
| 44 | # Edge Case: Handle potential name collision by retrying until unique name is found |
| 45 | while True: |
| 46 | # Generate two random uppercase letters |
| 47 | letters = ''.join(random.choices(string.ascii_uppercase, k=2)) |
| 48 | # Generate three random digits |
| 49 | digits = ''.join(random.choices(string.digits, k=3)) |
| 50 | # Combine to form the name |
| 51 | new_name = letters + digits |
| 52 | |
| 53 | # Check if this name is already used |
| 54 | if new_name not in Robot._used_names: |
| 55 | # Add to used names and assign to robot |
| 56 | Robot._used_names.add(new_name) |
| 57 | self._name = new_name |
| 58 | break |
| 59 | |
| 60 | # Handled Edge Cases: Robot has no name assigned yet, Resetting a robot that has a name - remove old name from used names, Handle potential name collision by retrying until unique name is found |