diff --git a/py/set.go b/py/set.go
index a09cc8d2..171900b3 100644
--- a/py/set.go
+++ b/py/set.go
@@ -215,6 +215,9 @@ func (a *Set) M__ne__(other Object) (Object, error) {
 	if err != nil {
 		return nil, err
 	}
+	if eq == NotImplemented {
+		return eq, nil
+	}
 	if eq == True {
 		return False, nil
 	}
diff --git a/py/tests/set.py b/py/tests/set.py
index f2f867a7..e7023495 100644
--- a/py/tests/set.py
+++ b/py/tests/set.py
@@ -72,4 +72,15 @@
 assert 4 in c
 assert 5 in c
 
+doc="__eq__, __ne__"
+a = set([1,2,3])
+assert a.__eq__(3) != True
+assert a.__ne__(3) != False
+assert a.__ne__(3) != True
+assert a.__ne__(3) != False # This part should be changed in comparison with NotImplemented
+
+assert a.__ne__(set()) == True
+assert a.__eq__({1,2,3}) == True
+assert a.__ne__({1,2,3}) == False
+
 doc="finished"
\ No newline at end of file