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SF bug #699934: Obscure error message

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Clarify error message for mro conflicts.
This commit is contained in:
Raymond Hettinger 2003-03-12 04:25:42 +00:00
parent 45c3941510
commit 83245b5828
2 changed files with 11 additions and 4 deletions
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10
Lib/test/test_descr.py
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@ -1062,6 +1062,10 @@ def consistency_with_epg():
(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 @@ def mro_disagreement():
# 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 @@ def mro_disagreement():
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():