diff --git a/py/set.go b/py/set.go
index b1b74e26..718e286c 100644
--- a/py/set.go
+++ b/py/set.go
@@ -46,6 +46,17 @@ func NewSetFromItems(items []Object) *Set {
return s
}
+func init() {
+ SetType.Dict["add"] = MustNewMethod("add", func(self Object, args Tuple) (Object, error) {
+ setSelf := self.(*Set)
+ if len(args) != 1 {
+ return nil, ExceptionNewf(TypeError, "append() takes exactly one argument (%d given)", len(args))
+ }
+ setSelf.Add(args[0])
+ return NoneType{}, nil
+ }, 0, "add(value)")
+}
+
// Add an item to the set
func (s *Set) Add(item Object) {
s.items[item] = SetValue{}
diff --git a/py/tests/set.py b/py/tests/set.py
index 834e457b..3eeaf1d3 100644
--- a/py/tests/set.py
+++ b/py/tests/set.py
@@ -2,6 +2,8 @@
# Use of this source code is governed by a BSD-style
# license that can be found in the LICENSE file.
+from libtest import assertRaises
+
doc="__and__"
a = {1, 2, 3}
b = {2, 3, 4, 5}
@@ -81,6 +83,18 @@
assert 4 in c
assert 5 in c
+doc="add"
+a = set()
+a.add(1)
+a.add(2)
+a.add(3)
+assert len(a) == 3
+assert 1 in a
+assert 2 in a
+assert 3 in a
+assert 4 not in a
+assertRaises(TypeError, lambda: a.add())
+
doc="__eq__, __ne__"
a = set([1,2,3])
assert a.__eq__(3) != True
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