#39266: fix lint issue

Author: dcoudert

src/sage/graphs/digraph_generators.py

@@ -1042,13 +1042,15 @@ def DeBruijn(self, k, n, vertices='strings', immutable=True):
 
             if not n:
                 multiedges = True
+
                 def edges():
                     v = W[0]
                     vs = v.string_rep()
                     return ((vs, vs, a.string_rep()) for a in A)
 
             else:
                 multiedges = False
+
                 def edges():
                     for w in W:
                         ww = w[1:]