SF bug #699934: Obscure error message
Clarify error message for mro conflicts.
diff --git a/Lib/test/test_descr.py b/Lib/test/test_descr.py
index 946a529..d925c75 100644
--- a/Lib/test/test_descr.py
+++ b/Lib/test/test_descr.py
@@ -1062,6 +1062,10 @@
(EditableScrollablePane, ScrollablePane, EditablePane,
Pane, ScrollingMixin, EditingMixin, object))
+mro_err_msg = """Cannot create class.The superclasses have conflicting
+inheritance trees which leave the method resolution order (MRO)
+undefined for bases """
+
def mro_disagreement():
if verbose: print "Testing error messages for MRO disagreement..."
def raises(exc, expected, callable, *args):
@@ -1079,9 +1083,9 @@
# Test some very simple errors
raises(TypeError, "duplicate base class A",
type, "X", (A, A), {})
- raises(TypeError, "MRO conflict among bases ",
+ raises(TypeError, mro_err_msg,
type, "X", (A, B), {})
- raises(TypeError, "MRO conflict among bases ",
+ raises(TypeError, mro_err_msg,
type, "X", (A, C, B), {})
# Test a slightly more complex error
class GridLayout(object): pass
@@ -1089,7 +1093,7 @@
class VerticalGrid(GridLayout): pass
class HVGrid(HorizontalGrid, VerticalGrid): pass
class VHGrid(VerticalGrid, HorizontalGrid): pass
- raises(TypeError, "MRO conflict among bases ",
+ raises(TypeError, mro_err_msg,
type, "ConfusedGrid", (HVGrid, VHGrid), {})
def objects():