1 -class FileNotExistException(Exception): 2 """ 3 Thrown when the file does not exist 4 """ 5 pass 6 7 8 -class BadFormatException(Exception): 9 """ 10 Thrown when the file contains bad format other than expected 11 """ 12 pass 13 14 15 -class NotImplementedException(Exception): 16 """ 17 Thrown when the method has not been completed or need to be defined in it's child class 18 """ 19 pass 20