Return GO Terms for each user-specified GO ID. Note missing GO IDs.

def get_go2obj(self, goids):
        """Return GO Terms for each user-specified GO ID. Note missing GO IDs."""
        goids = goids.intersection(self.go2obj.keys())
        if len(goids) != len(goids):
            goids_missing = goids.difference(goids)
            print("  {N} MISSING GO IDs: {GOs}".format(N=len(goids_missing), GOs=goids_missing))
        return {go:self.go2obj[go] for go in goids}