Add comment explaining why we check against a list.

sagemath · Mar 31, 2022 · 8f12947 · 8f12947
1 parent b991973
commit 8f12947
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/src/sage/schemes/plane_conics/con_number_field.py b/src/sage/schemes/plane_conics/con_number_field.py
@@ -217,6 +217,8 @@ def has_rational_point(self, point=False, obstruction=False,
                     return False, self._local_obstruction
                 else:
                     return False
+            # `_(in)finite_obstructions` is `None` if the cache is empty,
+            # so we explicitly check against a list:
             if (not point) and self._finite_obstructions == [] and \
                self._infinite_obstructions == []:
                 # list of local obstructions is computed and empty, return True