Use relative imports

see #60

src/zope/interface/adapter.py

@@ -398,7 +398,7 @@ def subscriptions(self, required, provided):
 LookupBasePy = LookupBaseFallback # BBB
 
 try:
-    from _zope_interface_coptimizations import LookupBase
+    from ._zope_interface_coptimizations import LookupBase
 except ImportError: #pragma NO COVER
     LookupBase = LookupBaseFallback
 
@@ -434,7 +434,7 @@ def subscriptions(self, required, provided):
 VerifyingBasePy = VerifyingBaseFallback #BBB
 
 try:
-    from _zope_interface_coptimizations import VerifyingBase
+    from ._zope_interface_coptimizations import VerifyingBase
 except ImportError: #pragma NO COVER
     VerifyingBase = VerifyingBaseFallback
 

src/zope/interface/declarations.py

@@ -640,11 +640,11 @@ def __get__(self, inst, cls):
 
 # Try to get C base:
 try:
-    import _zope_interface_coptimizations
+    from . import _zope_interface_coptimizations
 except ImportError:  #pragma NO COVERAGE
     pass
 else:  #pragma NO COVERAGE
-    from _zope_interface_coptimizations import ClassProvidesBase
+    from ._zope_interface_coptimizations import ClassProvidesBase
 
 
 class ClassProvides(Declaration, ClassProvidesBase):
@@ -917,13 +917,13 @@ def _normalizeargs(sequence, output = None):
 _empty = Declaration()
 
 try:
-    import _zope_interface_coptimizations
+    from . import _zope_interface_coptimizations
 except ImportError: #pragma NO COVER
     pass
 else: #pragma NO COVER PyPy
-    from _zope_interface_coptimizations import implementedBy
-    from _zope_interface_coptimizations import providedBy
-    from _zope_interface_coptimizations import getObjectSpecification
-    from _zope_interface_coptimizations import ObjectSpecificationDescriptor
+    from ._zope_interface_coptimizations import implementedBy
+    from ._zope_interface_coptimizations import providedBy
+    from ._zope_interface_coptimizations import getObjectSpecification
+    from ._zope_interface_coptimizations import ObjectSpecificationDescriptor
 
 objectSpecificationDescriptor = ObjectSpecificationDescriptor()

src/zope/interface/interface.py

@@ -114,7 +114,7 @@ def isOrExtends(self, interface):
 
 SpecificationBase = SpecificationBasePy
 try:
-    from _zope_interface_coptimizations import SpecificationBase
+    from ._zope_interface_coptimizations import SpecificationBase
 except ImportError: #pragma NO COVER
     pass
 
@@ -155,14 +155,14 @@ def __adapt__(self, obj):
 
 InterfaceBase = InterfaceBasePy
 try:
-    from _zope_interface_coptimizations import InterfaceBase
+    from ._zope_interface_coptimizations import InterfaceBase
 except ImportError: #pragma NO COVER
     pass
 
 
 adapter_hooks = []
 try:
-    from _zope_interface_coptimizations import adapter_hooks
+    from ._zope_interface_coptimizations import adapter_hooks
 except ImportError: #pragma NO COVER
     pass
 

src/zope/interface/tests/test_optimizations.py

@@ -0,0 +1,12 @@
+from platform import python_implementation
+import unittest
+
+class TestOptimizations(unittest.TestCase):
+
+    def test_optimizations(self):
+        if python_implementation() != 'CPython':
+            return
+        from zope.interface import _zope_interface_coptimizations
+        from zope.interface.adapter import LookupBase
+        self.assertTrue(LookupBase is _zope_interface_coptimizations.LookupBase)
+