fix name lookup in class scope

Cython/Compiler/ExprNodes.py

@@ -1779,6 +1779,7 @@ class NameNode(AtomicExprNode):
         elif entry.is_pyglobal:
             assert entry.type.is_pyobject, "Python global or builtin not a Python object"
             interned_cname = code.intern_identifier(self.entry.name)
+            if entry.scope.is_module_scope:
                 code.globalstate.use_utility_code(
                     UtilityCode.load_cached("GetModuleGlobalName", "ObjectHandling.c"))
                 code.putln(
@@ -1786,6 +1787,16 @@ class NameNode(AtomicExprNode):
                         self.result(),
                         interned_cname,
                         code.error_goto_if_null(self.result(), self.pos)))
+            else:
+                # FIXME: is_pyglobal is also used for class namespace
+                code.globalstate.use_utility_code(
+                    UtilityCode.load_cached("GetNameInClass", "ObjectHandling.c"))
+                code.putln(
+                    '%s = __Pyx_GetNameInClass(%s, %s); %s' % (
+                        self.result(),
+                        entry.scope.namespace_cname,
+                        interned_cname,
+                        code.error_goto_if_null(self.result(), self.pos)))
             code.put_gotref(self.py_result())
 
         elif entry.is_local or entry.in_closure or entry.from_closure or entry.type.is_memoryviewslice:

Cython/Utility/ObjectHandling.c

@@ -599,6 +599,23 @@ static PyObject *__Pyx_GetBuiltinName(PyObject *name) {
     return result;
 }
 
+/////////////// GetNameInClass.proto ///////////////
+
+static PyObject *__Pyx_GetNameInClass(PyObject *nmspace, PyObject *name); /*proto*/
+
+/////////////// GetNameInClass ///////////////
+//@requires: PyObjectGetAttrStr
+//@requires: GetModuleGlobalName
+//@substitute: naming
+
+static PyObject *__Pyx_GetNameInClass(PyObject *nmspace, PyObject *name) {
+    PyObject *result;
+    result = __Pyx_PyObject_GetAttrStr(nmspace, name);
+    if (!result)
+        result = __Pyx_GetModuleGlobalName(name);
+    return result;
+}
+
 /////////////// GetModuleGlobalName.proto ///////////////
 
 static CYTHON_INLINE PyObject *__Pyx_GetModuleGlobalName(PyObject *name); /*proto*/

tests/run/py_classbody.py

+# mode: run
+# tag: pyclass, global
+
+
+pyvar = 2
+
+class TestPyAttr(object):
+    """
+    >>> TestPyAttr.pyvar    # doctest: +ELLIPSIS
+    Traceback (most recent call last):
+    AttributeError: ...TestPyAttr...has no attribute 'pyvar'
+    >>> TestPyAttr.pyval1
+    3
+    >>> TestPyAttr.pyval2
+    2
+    """
+    pyvar = 3
+    pyval1 = pyvar
+    del pyvar
+    pyval2 = pyvar
+
+
+import cython
+cdefvar = cython.declare(int, 10)
+
+class TestCdefAttr(object):
+    """
+    >>> TestCdefAttr.cdefvar   # doctest: +ELLIPSIS
+    Traceback (most recent call last):
+    AttributeError: ...TestCdefAttr...has no attribute 'cdefvar'
+    >>> TestCdefAttr.cdefval1
+    11
+
+    >>> #TestCdefAttr.cdefval2
+    """
+    cdefvar = 11
+    cdefval1 = cdefvar
+    del cdefvar
+    # cdefval2 = cdefvar       # FIXME: doesn't currently work ...