'Get Default value for a given (section, option)
-> useful for type checking in \'get\' method'

def get_default(self, section, option):

    section = self._check_section_option(section, option)
    for (sec, options) in self.defaults:
        if (sec == section):
            if (option in options):
                return options[option]
    else:
        return NoDefault
