diff --git a/src/list.c b/src/list.c
index dee6509..c1d9b9c 100644
--- a/src/list.c
+++ b/src/list.c
@@ -206,6 +206,7 @@ static void list_print(struct _list* self)
  */
 struct _list* list_slice(struct _list *self, int start, int end, int step)
 {
+#if 1
     assert(self != NULL);
     int i = 0;
     bool unlimited = false;
@@ -323,6 +324,72 @@ struct _list* list_slice(struct _list *self, int start, int end, int step)
 
 done:
     return list;
+#else
+    assert(self != NULL);
+    list_t list = NULL;
+    bool empty = false;
+    uint32_t capacity = 1;
+    int i = 0;
+    if(step == 0)
+    {
+        return NULL;
+    }
+    
+    if(step > 0)
+    {
+        // special case 
+        if(start == LIST_UNLIMITED)
+        {
+            start = 0;
+        }
+        if(end == LIST_UNLIMITED)
+        {
+            end = self->size(self);
+        }
+
+        // [start_max, end_min] start < end and limit start_max and end_min
+        if(start >= end || start >= self->size(self) || end < -self->size(self))
+        {
+            empty = true;
+        }
+
+        if(start < 0)
+        {
+            if(start < -self->size(self))
+            {
+                start = -self->size(self);
+            }
+            start += self->size(self);
+        }
+
+        if(end < 0)
+        {
+            end += self->size(self);
+        }
+    }
+    else
+    {
+
+    }
+
+    
+    if(empty != true)
+    {
+        // calc capacity
+
+    }
+    list_t list = list_new2(self->_obj_size, capacity);
+    if(list == NULL)
+    {
+        return NULL;
+    }
+    list->compare = self->compare;
+    list->print_obj = self->print_obj;
+
+
+done:
+    return list;
+#endif
 }
 
 static bool list_iter_hasnext(struct _iterator* iter)
diff --git a/test/test_list.c b/test/test_list.c
index 24d6503..843f8f6 100644
--- a/test/test_list.c
+++ b/test/test_list.c
@@ -471,6 +471,17 @@ static void test_list_slice_empty(void)
     TEST_ASSERT_TRUE(list2->empty(list2));
     list_free(&list2);
 
+    // -------------------- empty --------------------
+    list2 = list->slice(list, len, len + 10, 1); // if start > start_max
+    TEST_ASSERT_NOT_NULL(list2);
+    TEST_ASSERT_TRUE(list2->empty(list2));
+    list_free(&list2);
+
+    list2 = list->slice(list, -len - 10, -len, 1); // if end < end_min
+    TEST_ASSERT_NOT_NULL(list2);
+    TEST_ASSERT_TRUE(list2->empty(list2));
+    list_free(&list2);
+
     list_free(&list);
 }
 
@@ -507,6 +518,18 @@ static void test_list_slice_positive(void)
     }
     list_free(&list2);
 
+    // python: list[0:11] if len(list) == 10
+    list2 = list->slice(list, 0, len + 1, 1);
+    TEST_ASSERT_NOT_NULL(list2);
+    // list2->print(list2); printf("\n");
+    TEST_ASSERT_EQUAL_INT(len, list2->size(list2));
+    for(i = 0; i < list2->size(list2); i++)
+    {
+        TEST_ASSERT_TRUE(list2->get(list2, i, &temp));
+        TEST_ASSERT_EQUAL_INT(data[i], temp);
+    }
+    list_free(&list2);
+
     // python: list[-6:8] or list[-6:-2] or list[4:8]
     list2 = list->slice(list, 4, 8, 1);
     TEST_ASSERT_NOT_NULL(list2);
@@ -614,9 +637,9 @@ static void test_list_slice_negative(void)
     }
     list_free(&list2);
 
-    // -------------------- step == 2 --------------------
-    // list[-30:-1]
-    list2 = list->slice(list, -30, -1, 1);
+    // -------------------- start_limit --------------------
+    // list[-len-1:-1]
+    list2 = list->slice(list, -len-1, -1, 1);
     TEST_ASSERT_NOT_NULL(list2);
     // list2->print(list2); printf("\n");
     TEST_ASSERT_EQUAL_INT(len - 1, list2->size(list2));
@@ -627,12 +650,6 @@ static void test_list_slice_negative(void)
     }
     list_free(&list2);
 
-    // list[-30:-10]
-    list2 = list->slice(list, -30, -10, 1);
-    TEST_ASSERT_NOT_NULL(list2);
-    TEST_ASSERT_TRUE(list2->empty(list2));
-    list_free(&list2);
-
     list_free(&list);
 }