file_format.py 文件源码

def validate(self, level='max'):
        _check_validation_level(level)

        if not self.path.is_file():
            raise ValidationError("%s is not a file." % self.path)

        if hasattr(self, '_validate_'):
            try:
                self._validate_(level)
            except ValidationError as e:
                raise ValidationError(
                    "%s is not a(n) %s file:\n\n%s"
                    % (self.path, self.__class__.__name__, str(e))
                    ) from e
        # TODO: remove this branch
        elif hasattr(self, 'sniff'):
            if not self.sniff():
                raise ValidationError("%s is not a(n) %s file"
                                      % (self.path, self.__class__.__name__))

        # TODO: define an abc.abstractmethod for `validate` when sniff is
        # removed instead of this
        else:
            raise NotImplementedError("%r does not implement validate."
                                      % type(self))