def __cmp__(self, other):
        """Comparison of two GeometryEntities."""
        n1 = self.__class__.__name__
        n2 = other.__class__.__name__
        c = (n1 > n2) - (n1 < n2)
        if not c:
            return 0

        i1 = -1
        for cls in self.__class__.__mro__:
            try:
                i1 = ordering_of_classes.index(cls.__name__)
                break
            except __HOLE__:
                i1 = -1
        if i1 == -1:
            return c

        i2 = -1
        for cls in other.__class__.__mro__:
            try:
                i2 = ordering_of_classes.index(cls.__name__)
                break
            except ValueError:
                i2 = -1
        if i2 == -1:
            return c

        return (i1 > i2) - (i1 < i2)
dataset/ETHPy150Open sympy/sympy/sympy/geometry/entity.py/GeometryEntity.__cmp__