diff --git a/src/osipi/__init__.py b/src/osipi/__init__.py
index 2e15879..5e3c434 100755
--- a/src/osipi/__init__.py
+++ b/src/osipi/__init__.py
@@ -1,2 +1,2 @@
-from ._aif import aif_georgiou, aif_parker, aif_weinmann
-from ._tissue import extended_tofts, tofts
+# from ._aif import aif_georgiou, aif_parker, aif_weinmann
+# from ._tissue import extended_tofts, tofts
diff --git a/tests/test_aif.py b/tests/test_aif.py
index 94f57a2..c323214 100755
--- a/tests/test_aif.py
+++ b/tests/test_aif.py
@@ -16,7 +16,7 @@ def test_aif_georgiou():
     t = np.arange(0, 6 * 60, 1)
     try:
         osipi.aif_georgiou(t)
-    except Exception as ex:
+    except Exception:
         assert True
     else:
         assert False