Use C3 (mostly) to compute IRO.issue21

Fixes #21

The 'mostly' is because interfaces are used in cases that C3 forbids;
when there's a conflict, we fallback to the legacy algorithm. It turns
out there are few conflicts (13K out of 149K total orderings in Plone).

I hoped the fix for #8 might shake out automatically, but it didn't.

Optimize the extremely common case of a __bases__ of length one.

In the benchmark, 4/5 of the interfaces and related objects have a base of length one.

Fix the bad IROs in the bundled ABC interfaces, and implement a way to get warnings or errors.

In running plone/buildout.coredev and tracking the RO requests, the
stats for equal, not equal, and inconsistent-so-fallback, I got
{'ros': 148868, 'eq': 138461, 'ne': 10407, 'inconsistent': 12934}

Add the interface module to the Attribute str.

This was extremely helpful tracking down the Plone problem; IDate is defined in multiple modules.

1 files changed, 4 insertions, 4 deletions

diff --git a/src/zope/interface/tests/test_interface.py b/src/zope/interface/tests/test_interface.py
index 7bde955..df7f84b 100644
--- a/src/zope/interface/tests/test_interface.py
+++ b/src/zope/interface/tests/test_interface.py
@@ -1911,7 +1911,7 @@ class AttributeTests(ElementTests):
         method.interface = type(self)
         r = repr(method)
         self.assertTrue(r.startswith('<zope.interface.interface.Attribute object at'), r)
-        self.assertTrue(r.endswith(' AttributeTests.TestAttribute>'), r)
+        self.assertTrue(r.endswith(' ' + __name__ + '.AttributeTests.TestAttribute>'), r)
 
     def test__repr__wo_interface(self):
         method = self._makeOne()
@@ -1923,7 +1923,7 @@ class AttributeTests(ElementTests):
         method = self._makeOne()
         method.interface = type(self)
         r = str(method)
-        self.assertEqual(r, 'AttributeTests.TestAttribute')
+        self.assertEqual(r, __name__ + '.AttributeTests.TestAttribute')
 
     def test__str__wo_interface(self):
         method = self._makeOne()
@@ -1998,7 +1998,7 @@ class MethodTests(AttributeTests):
         method.interface = type(self)
         r = repr(method)
         self.assertTrue(r.startswith('<zope.interface.interface.Method object at'), r)
-        self.assertTrue(r.endswith(' MethodTests.TestMethod(**kw)>'), r)
+        self.assertTrue(r.endswith(' ' + __name__ + '.MethodTests.TestMethod(**kw)>'), r)
 
     def test__repr__wo_interface(self):
         method = self._makeOne()
@@ -2012,7 +2012,7 @@ class MethodTests(AttributeTests):
         method.kwargs = 'kw'
         method.interface = type(self)
         r = str(method)
-        self.assertEqual(r, 'MethodTests.TestMethod(**kw)')
+        self.assertEqual(r, __name__ + '.MethodTests.TestMethod(**kw)')
 
     def test__str__wo_interface(self):
         method = self._makeOne()