def unstar_review_group(self, review_group):
        if self.starred_groups.filter(pk=review_group.pk).count() > 0:
            self.starred_groups.remove(review_group)
_eapply helper to tell whether ``e`` and all its args
dataset/ETHPy150Open reviewboard/reviewboard/reviewboard/accounts/models.py/Profile.unstar_review_group--crossover with--dataset/ETHPy150Open sympy/sympy/sympy/simplify/trigsimp.py/_is_Expr