Exceptions.py

class FileFormatException(Exception):
    """
    Exception that signals that a file was not of the expected format.
    """
 
    pass
 
class InvalidArgumentException(Exception):
    """
    Exception that signals that an argument passed to a function was bad.
    """
 
    pass
 
class OutOfRangeException(InvalidArgumentException):
    """
    Exception that signals that a passed argument was out of its valid range.
    """
 
    pass