def __len__(self):
        return max(0, -(-(self._stop - self._start) // self._step))
Figure out the SVN revision number based on the existance of
dataset/ETHPy150Open pydata/pandas/pandas/indexes/range.py/RangeIndex.__len__--crossover with--dataset/ETHPy150Open kuri65536/python-for-android/python-modules/twisted/twisted/python/versions.py/Version._getSVNVersion