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You can try something like:

sage: R.<x,y> = QQ[]
sage: R
Multivariate Polynomial Ring in x, y over Rational Field
sage: I = R.ideal(x^2+y)
sage: S = R.quotient(I)
sage: S
Quotient of Multivariate Polynomial Ring in x, y over Rational Field by the ideal (x^2 + y)
sage: s = S._singular_()
sage: s
//   characteristic : 0
//   number of vars : 2
//        block   1 : ordering dp
//                  : names    x y
//        block   2 : ordering C
// quotient ring from ideal
_[1]=x2+y
sage: type(s)
<class 'sage.interfaces.singular.SingularElement'>