input: Write a function to check if the download has been completed.
  assert ExerciseRepositoryExercise().get_download_percent() == 0
  assert ExerciseRepositoryExercise().get_state() == "none"
output: def is_download_complete():
      return ExerciseRepositoryExercise().get_download_percent() == 100 and ExerciseRepositoryExercise().get_state() == "completed"