class MyException(Exception):
    __metaclass__ = ABCMeta
    ## $constructor
    def __init__(self, value):
        ## @var self.__subReason a more detailed reason for the exception
        self.subReason = value
.
.

class OptionSectionException(MyException):
    ## the constructor
    def __init__(self, value):
        MyException.__init__(self, value)
.
.
    def getMessage(self):
        return 'Problem during parsing the required section [OPTION]: ' + self.subReason <-----

--->AttributeError: type object 'OptionSectionException' has no attribute 'subReason'