def _initialiseIteration(self):
        self._searchIterator = self._search(
            self._request.start, self._request.end)
        self._currentObject = next(self._searchIterator, None)
        if self._currentObject is not None:
            self._nextObject = next(self._searchIterator, None)
            self._searchAnchor = self._request.start
            self._distanceFromAnchor = 0
            firstObjectStart = self._getStart(self._currentObject)
            if firstObjectStart > self._request.start:
                self._searchAnchor = firstObjectStart
Construct the no_sub_classes context manager.
dataset/ETHPy150Open ga4gh/server/ga4gh/backend.py/IntervalIterator._initialiseIteration--crossover with--dataset/ETHPy150Open MongoEngine/mongoengine/mongoengine/context_managers.py/no_sub_classes.__init__