Restored ability to build on Python 2

src/pya/pya/pyaCallables.cc

@@ -663,7 +663,12 @@ method_adaptor (int mid, PyObject *self, PyObject *args)
 
     //  method is not implemented
     if (! meth) {
+#if PY_MAJOR_VERSION < 3
+      PyErr_SetNone(PyExc_NotImplementedError);
+      return NULL;
+#else
       Py_RETURN_NOTIMPLEMENTED;
+#endif
     }
 
     //  handle special methods

testdata/python/basic.py

@@ -3077,6 +3077,11 @@ class BasicTest(unittest.TestCase):
   # fallback to __rmul__ for not implemented __mul__
 
   def test_90(self):
+
+    # skip this test for Python 2
+    if sys.version_info < (3, 0):
+      return
+
     class RMulObject:
       def __init__(self, factor):
         self.factor = factor