add getattr/setattr test

attributes.py

@@ -0,0 +1,16 @@
+from __future__ import division, print_function
+
+class SomeClass(object):
+    def __setattr__(self, name, value):
+        print("Setting {} to value {}".format(name, value))
+        self.__dict__[name] = value
+
+    def __getattr__(self, name):
+        print("Getting {}".format(name))
+        return None
+
+o = SomeClass()
+o.xxx = "yyy"
+o.xxx = "zzz"
+print(o.xxx)  # Note: __getattr__ does not get called here!
+print(o.nope)