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 nlloyd/SubliminalCollaborator/libs/twisted/python/randbytes.py/RandomFactory._osUrandom