diff --git a/py/set.go b/py/set.go
index af4eb4e5..a27143ba 100644
--- a/py/set.go
+++ b/py/set.go
@@ -142,6 +142,43 @@ func (s *Set) M__or__(other Object) (Object, error) {
return ret, nil
}
+func (s *Set) M__sub__(other Object) (Object, error) {
+ ret := NewSet()
+ b, ok := other.(*Set)
+ if !ok {
+ return nil, ExceptionNewf(TypeError, "unsupported operand type(s) for &: '%s' and '%s'", s.Type().Name, other.Type().Name)
+ }
+ for j := range s.items {
+ ret.items[j] = SetValue{}
+ }
+ for i := range b.items {
+ if _, ok := s.items[i]; ok {
+ delete(ret.items, i)
+ }
+ }
+ return ret, nil
+}
+
+func (s *Set) M__xor__(other Object) (Object, error) {
+ ret := NewSet()
+ b, ok := other.(*Set)
+ if !ok {
+ return nil, ExceptionNewf(TypeError, "unsupported operand type(s) for &: '%s' and '%s'", s.Type().Name, other.Type().Name)
+ }
+ for j := range s.items {
+ ret.items[j] = SetValue{}
+ }
+ for i := range b.items {
+ _, ok := s.items[i]
+ if ok {
+ delete(ret.items, i)
+ } else {
+ ret.items[i] = SetValue{}
+ }
+ }
+ return ret, nil
+}
+
// Check interface is satisfied
var _ I__len__ = (*Set)(nil)
var _ I__bool__ = (*Set)(nil)
diff --git a/py/tests/set.py b/py/tests/set.py
index e46b412a..f6fa539a 100644
--- a/py/tests/set.py
+++ b/py/tests/set.py
@@ -30,4 +30,32 @@
assert 4 in c
assert 5 in c
+doc="__sub__"
+a = {1, 2, 3}
+b = {2, 3, 4, 5}
+c = a.__sub__(b)
+d = b.__sub__(a)
+assert 1 in c
+assert 4 in d
+assert 5 in d
+
+e = a - b
+f = b - a
+assert 1 in c
+assert 4 in d
+assert 5 in d
+
+doc="__xor__"
+a = {1, 2, 3}
+b = {2, 3, 4, 5}
+c = a.__xor__(b)
+assert 1 in c
+assert 4 in c
+assert 5 in c
+
+d = a ^ b
+assert 1 in c
+assert 4 in c
+assert 5 in c
+
doc="finished"
\ No newline at end of file
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