how to make element check code simpler or one-liner in python?

I wanna make simple condition to check whether element 'a' in A and element 'b' in B has a some characteristic.

the below code operates well, it looks dirty, so, I wanna make it simpler, or one-liner. are there any way to do that?

    def check_direction(A, B):
        for a in A:
            for b in B:
                if c_matrix.loc()[a][b]!="->":
                    return False
        return True