Error handling

import time

from learning_commons_evaluators import (
  ConfigurationError,
  EvaluatorError,
  GradeLevelAppropriatenessEvaluator,
  RateLimitError,
)

try:
  evaluator = GradeLevelAppropriatenessEvaluator(google_api_key="your-google-key")
except ConfigurationError as error:
  raise SystemExit(error)

for attempt in range(3):
  try:
    result = evaluator.evaluate_sync(text="The cat's out of the bag now.")
    break
  except EvaluatorError as error:
    if not error.retryable or attempt == 2:
      raise
    wait_ms = error.retry_after_ms if isinstance(error, RateLimitError) else None
    time.sleep(wait_ms / 1000 if wait_ms else 2 ** attempt)