Method transitions

Lib/test/datetimetester.py:6793–6796

(self)

    def transitions(self):
        for (_, prev_ti), (t, ti) in pairs(zip(self.ut, self.ti)):
            shift = ti[0] - prev_ti[0]
            yield (EPOCH_NAIVE + timedelta(seconds=t)), shift

    def nondst_folds(self):
        """Find all folds with the same value of isdst on both sides of the transition."""