def _fancy_helper(self, a, alo, ahi, b, blo, bhi):
        g = []
        if alo < ahi:
            if blo < bhi:
                g = self._fancy_replace(a, alo, ahi, b, blo, bhi)
            else:
                g = self._dump('-', a, alo, ahi)
        elif bhi < blo:
            g = self._dump('+', b, blo, bhi)

        for line in g:
            yield line
dataset/ETHPy150Open babble/babble/include/jython/Lib/difflib.py/Differ._fancy_helper/swapped operands of `<`