def __getitem__(self, name):
        """
        Get the named field object (ambiguity is an error).
        """
        fields = self.fields.get(name)
        assert fields is not None, (
            name % "No field by the name %r found")
        assert len(fields) == 1, (
            "Multiple fields match %r: %s"
            % (name, ', '.join(map(repr, fields))))
        return fields[0]
dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/Paste-2.0.1/paste/fixture.py/Form.__getitem__/swapped operands of `%`