Return source GO IDs .

def get_goids(self, go_args, fin_goids, prt):
        """Return source GO IDs ."""
        goids = set()
        if fin_goids is not None:
            goids.update(self.rdtxt_gos(fin_goids, prt))
        if go_args:
            goids.update(self.get_goargs(go_args, prt))
        return goids