def _osUrandom(self, nbytes):
        """
        Wrapper around C{os.urandom} that cleanly manage its absence.
        """
        try:
            return os.urandom(nbytes)
        except (AttributeError, __HOLE__), e:
            raise SourceNotAvailable(e)
dataset/ETHPy150Open kuri65536/python-for-android/python-modules/twisted/twisted/python/randbytes.py/RandomFactory._osUrandom