Revolut interview - coding session [Rejected]

That was a Python interview for a senior role. The interviewer was nice and answered the questions about the tasks. Rejection letter: `Unfortunately, after much consideration, we have decided not to p

That was a Python interview for a senior role. The interviewer was nice and answered the questions about the tasks. Rejection letter: Unfortunately, after much consideration, we have decided not to proceed further with your application, as we require more specific knowledge to be successful in our recruitment process. Tasks were very easy for me. I spent more time asking the interviewer what he wanted to see in my code. Coding session took around an hour. Write a class that will register strings, but no more than 10 of them (raise an error in case of overflow). Make a test for that. Add a method `get` that will randomly return one of the strings. Write a test for that method. Make it possible to switch `get` to round robin. Write a test for that.

My solution was written during an interview. app.py removed redundant spaces from random import choice from typing import Callable from revolut.constants import BALANCER_INSTANCE_LIMIT class BalancerError(Exception): ... class AlreadyRegisteredInstance(BalancerError): ... class OverLimitInstances(BalancerError): ... class EmptyInstancesRegistry(BalancerError): ... class RoundRobinStrategy: def init(self): self._current_index = 0 def call(self, instances: list[str]) -> str: element = instances[self._current_index] self._current_index = ( self._current_index + 1 if self._current_index < len(instances) - 1 else 0 )

return element class Balancer: def init(self, randomizer: Callable = choice): self._randomizer = randomizer self._instances = list() def register(self, url: str) -> None: if url in self._instances: raise AlreadyRegisteredInstance("Instance already registered") if len(self._instances) == BALANCER_INSTANCE_LIMIT: raise OverLimitInstances(f"{BALANCER_INSTANCE_LIMIT}") self._instances.append(url) def get(self) -> str: if len(self._instances) == 0: raise EmptyInstancesRegistry return self._randomizer(self._instances)