frontend.py 文件源码

def process(self, opt, value, values, parser):
        """
        Call the validator function on applicable settings and
        evaluate the 'overrides' option.
        Extends `optparse.Option.process`.
        """
        result = optparse.Option.process(self, opt, value, values, parser)
        setting = self.dest
        if setting:
            if self.validator:
                value = getattr(values, setting)
                try:
                    new_value = self.validator(setting, value, parser)
                except Exception, error:
                    raise (optparse.OptionValueError(
                        'Error in option "%s":\n    %s'
                        % (opt, ErrorString(error))),
                           None, sys.exc_info()[2])
                setattr(values, setting, new_value)
            if self.overrides:
                setattr(values, self.overrides, None)
        return result