Trac #32769: sage.categories.coxeter_groups: Remove module-level imports from sage.rings, sage.graphs

(cherry-picked from #32432)

URL: https://trac.sagemath.org/32769
Reported by: mkoeppe
Ticket author(s): Matthias Koeppe
Reviewer(s): Travis Scrimshaw

Author: Release Manager

src/sage/categories/coxeter_groups.py

@@ -22,8 +22,6 @@
 from sage.categories.generalized_coxeter_groups import GeneralizedCoxeterGroups
 from sage.structure.element import have_same_parent, parent
 from sage.misc.flatten import flatten
-from sage.graphs.digraph import DiGraph
-from sage.rings.integer_ring import ZZ
 from copy import copy
 from collections import deque
 
@@ -2913,6 +2911,7 @@ def kazhdan_lusztig_cell(self, side='left'):
             """
             from sage.algebras.iwahori_hecke_algebra import IwahoriHeckeAlgebra
             from sage.rings.polynomial.laurent_polynomial_ring import LaurentPolynomialRing
+            from sage.rings.integer_ring import ZZ
 
             R = LaurentPolynomialRing(ZZ, 'v')
             v = R.gen(0)
@@ -2943,6 +2942,6 @@ def kazhdan_lusztig_cell(self, side='left'):
                             vertices.add(y)
                             queue.appendleft(y)
 
+            from sage.graphs.digraph import DiGraph
             g = DiGraph([list(vertices), list(edges)])
             return set(g.strongly_connected_component_containing_vertex(w))
-