py: add __delitem__ to dict

Author: kellrott

py/dict.go

@@ -189,6 +189,19 @@ func (d StringDict) M__getitem__(key Object) (Object, error) {
 	return nil, ExceptionNewf(KeyError, "%v", key)
 }
 
+func (d StringDict) M__delitem__(key Object) (Object, error) {
+	str, ok := key.(String)
+	if !ok {
+		return nil, ExceptionNewf(KeyError, "%v", key)
+	}
+	_, ok = d[string(str)]
+	if !ok {
+		return nil, ExceptionNewf(KeyError, "%v", key)
+	}
+	delete(d, string(str))
+	return None, nil
+}
+
 func (d StringDict) M__setitem__(key, value Object) (Object, error) {
 	str, ok := key.(String)
 	if !ok {

py/tests/dict.py

@@ -46,6 +46,16 @@
         assert v == 5.5
 assertRaises(TypeError, a.items, 'a')
 
+doc="del"
+a = {'hello': 'world', 'hi': 'there'}
+del a["hello"]
+def doDel(d, key):
+    del d[key]
+assertRaises(KeyError, lambda: doDel(a, "bob"))
+assertRaises(KeyError, lambda: doDel(a, 123))
+assert not a.__contains__('hello')
+assert a.__contains__('hi')
+
 doc="__contain__"
 a = {'hello': 'world'}
 assert a.__contains__('hello')