Merge pull request #60 from chipaca/list_copy

Implemented list.copy. Fixes issue #54.

py/objlist.c

@@ -134,8 +134,15 @@ static mp_obj_t list_clear(mp_obj_t self_in) {
     return mp_const_none;
 }
 
+static mp_obj_t list_copy(mp_obj_t self_in) {
+    assert(MP_OBJ_IS_TYPE(self_in, &list_type));
+    mp_obj_list_t *self = self_in;
+    return mp_obj_new_list(self->len, self->items);
+}
+
 static MP_DEFINE_CONST_FUN_OBJ_2(list_append_obj, mp_obj_list_append);
 static MP_DEFINE_CONST_FUN_OBJ_1(list_clear_obj, list_clear);
+static MP_DEFINE_CONST_FUN_OBJ_1(list_copy_obj, list_copy);
 static MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(list_pop_obj, 1, 2, list_pop);
 static MP_DEFINE_CONST_FUN_OBJ_2(list_sort_obj, list_sort);
 
@@ -151,6 +158,7 @@ const mp_obj_type_t list_type = {
     { // method list
         { "append", &list_append_obj },
         { "clear", &list_clear_obj },
+        { "copy", &list_copy_obj },
         { "pop", &list_pop_obj },
         { "sort", &list_sort_obj },
         { NULL, NULL }, // end-of-list sentinel

tests/basics/tests/list_copy.py

+# list copy tests
+a = [1, 2, []]
+b = a.copy()
+a[-1].append(1)
+a.append(4)
+print(a)
+print(b)