Merge #32610

Author: Matthias Koeppe

src/sage/dynamics/arithmetic_dynamics/projective_ds.py

@@ -80,7 +80,6 @@ class initialization directly.
 from sage.rings.polynomial.flatten import FlatteningMorphism, UnflatteningMorphism
 from sage.rings.morphism import RingHomomorphism_im_gens
 from sage.rings.number_field.number_field_ideal import NumberFieldFractionalIdeal
-from sage.rings.number_field.number_field import is_NumberField
 from sage.rings.padics.all import Qp
 from sage.rings.polynomial.multi_polynomial_ring_base import is_MPolynomialRing
 from sage.rings.polynomial.polynomial_ring_constructor import PolynomialRing