Implement eq, ne for slice

Issue: #98

Author: HyeockJinKim

py/bool.go

@@ -93,6 +93,16 @@ func (a Bool) M__ne__(other Object) (Object, error) {
 	return True, nil
 }
 
+func notEq(eq Object, err error) (Object, error) {
+	if err != nil {
+		return nil, err
+	}
+	if eq == NotImplemented {
+		return eq, nil
+	}
+	return Not(eq)
+}
+
 // Check interface is satisfied
 var _ I__bool__ = Bool(false)
 var _ I__index__ = Bool(false)

py/slice.go

@@ -151,6 +151,31 @@ func (r *Slice) GetIndices(length int) (start, stop, step, slicelength int, err
 	return
 }
 
+func (a *Slice) M__eq__(other Object) (Object, error) {
+	b, ok := other.(*Slice)
+	if !ok {
+		return NotImplemented, nil
+	}
+
+	if a.Start != b.Start {
+		return False, nil
+	}
+
+	if a.Stop != b.Stop {
+		return False, nil
+	}
+
+	if a.Step != b.Step {
+		return False, nil
+	}
+
+	return True, nil
+}
+
+func (a *Slice) M__ne__(other Object) (Object, error) {
+	return notEq(a.M__eq__(other))
+}
+
 func init() {
 	SliceType.Dict["start"] = &Property{
 		Fget: func(self Object) (Object, error) {