diff --git a/py/set.go b/py/set.go
index cc27a464..f38b32ff 100644
--- a/py/set.go
+++ b/py/set.go
@@ -111,6 +111,20 @@ func (s *Set) M__iter__() (Object, error) {
return NewIterator(items), nil
}
+func (s *Set) M__and__(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 i := range b.items {
+ if _, ok := s.items[i]; ok {
+ 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
new file mode 100644
index 00000000..e1500ed1
--- /dev/null
+++ b/py/tests/set.py
@@ -0,0 +1,16 @@
+# Copyright 2019 The go-python Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file.
+
+doc="__and__"
+a = {1, 2, 3}
+b = {2, 3, 4, 5}
+c = a.__and__(b)
+assert 2 in c
+assert 3 in c
+
+d = a & b
+assert 2 in d
+assert 3 in d
+
+doc="finished"
\ No newline at end of file
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