Trac 20062: improvements related to imports

Author: pjbruin

src/sage/rings/power_series_poly.pyx

@@ -9,8 +9,6 @@ from power_series_ring_element cimport PowerSeries
 from sage.structure.element cimport Element, ModuleElement, RingElement
 from infinity import infinity, is_Infinite
 from sage.libs.all import PariError
-from power_series_ring_element import is_PowerSeries
-import rational_field
 from sage.misc.superseded import deprecated_function_alias
 
 cdef class PowerSeries_poly(PowerSeries):

src/sage/rings/power_series_ring_element.pyx

@@ -108,7 +108,8 @@ import rational_field, integer_ring
 from integer import Integer
 from sage.rings.finite_rings.integer_mod_ring import IntegerModRing
 from sage.libs.pari.all import pari
-from sage.misc.superseded import deprecated_function_alias
+from sage.misc.superseded import deprecated_function_alias, deprecation
+from warnings import warn
 
 from sage.categories.fields import Fields
 _Fields = Fields()
@@ -1059,11 +1060,9 @@ cdef class PowerSeries(AlgebraElement):
         """
         try:
             q, r = self.quo_rem(denom)
-            from warnings import warn
             warn("the operator // now returns the Euclidean quotient for power series over fields, use / for the true quotient")
             return q
         except (AttributeError, NotImplementedError):
-            from sage.misc.superseded import deprecation
             deprecation(20062, "the operator // is deprecated for power series over non-fields, use / instead")
             return self._div_(denom)