Fix the last doctest errors in pure-python mode about parent circles.…

… They were another manifestation of zopefoundation/ExtensionClass#3 and required a workaround.

src/Acquisition/__init__.py

@@ -628,7 +628,9 @@ def __getitem__(self, key):
 
     def __call__(self, *args, **kwargs):
         try:
-            call = getattr(type(self._obj), '__call__')
+            # Note we look this up on the completely unwrapped
+            # object, so as not to get a class
+            call = getattr(self.aq_base, '__call__')
         except AttributeError:
             # A TypeError is what the interpreter raises;
             # AttributeError is allowed to percolate through the
@@ -656,6 +658,9 @@ class _Acquirer(ExtensionClass.Base):
 
     def __getattribute__(self, name):
         try:
+            # workaround ExtensionClass bug #3
+            if name == '__parent__':
+                return object.__getattribute__(self, name)
             return ExtensionClass.Base.__getattribute__(self, name)
         except AttributeError:
             # the doctests have very specific error message
@@ -828,7 +833,7 @@ def aq_inContextOf(self, o, inner=True):
 
 if 'PURE_PYTHON' not in os.environ:  # pragma no cover
     try:
-        from _Acquisition import *
+        from ._Acquisition import *
     except ImportError:
         pass
 

src/Acquisition/tests.py

@@ -2432,7 +2432,8 @@ def test___parent__aq_parent_circles():
 
       >>> x.__parent__.aq_base is y.aq_base
       True
-
+      >>> Acquisition.aq_parent(x) is y
+      True
       >>> x.__parent__.__parent__ is x
       True