Get an item or attribute of an object but prefer the attribute.
        Unlike :meth:`getitem` the attribute *must* be a bytestring.

def getattr(self, obj, attribute):
        """Get an item or attribute of an object but prefer the attribute.
        Unlike :meth:`getitem` the attribute *must* be a bytestring.
        """
        try:
            return getattr(obj, attribute)
        except AttributeError:
            pass
        try:
            return obj[attribute]
        except (TypeError, LookupError, AttributeError):
            return self.undefined(obj=obj, name=attribute)