def __init__(self, string, atts=()):
        if not isinstance(string, unicode):
            raise ValueError(string % "unicode string required, got %r")
        self._s = string
        self._atts = FrozenDict(atts)
dataset/ETHPy150Open thomasballinger/curtsies/curtsies/formatstring.py/Chunk.__init__/swapped operands of `%`