Create RangeIndex from a range object.

def from_range(cls, data, name=None, dtype=None, **kwargs):
        """ Create RangeIndex from a range object. """
        if not isinstance(data, range):
            raise TypeError(
                '{0}(...) must be called with object coercible to a '
                'range, {1} was passed'.format(cls.__name__, repr(data)))

        start, stop, step = data.start, data.stop, data.step
        return RangeIndex(start, stop, step, dtype=dtype, name=name, **kwargs)