From d90b19eca56a361d432ab6af9c2305bb3f708e1c Mon Sep 17 00:00:00 2001
From: "John R. Lenton" <jlenton@gmail.com>
Date: Mon, 6 Jan 2014 18:11:20 +0000
Subject: [PATCH] Added dict.copy

---
 py/objdict.c                    | 10 ++++++++++
 tests/basics/tests/dict_copy.py |  5 +++++
 2 files changed, 15 insertions(+)
 create mode 100644 tests/basics/tests/dict_copy.py

diff --git a/py/objdict.c b/py/objdict.c
index 951e1ec068..7567a612cd 100644
--- a/py/objdict.c
+++ b/py/objdict.c
@@ -130,6 +130,15 @@ static mp_obj_t dict_clear(mp_obj_t self_in) {
 }
 static MP_DEFINE_CONST_FUN_OBJ_1(dict_clear_obj, dict_clear);
 
+static mp_obj_t dict_copy(mp_obj_t self_in) {
+    assert(MP_OBJ_IS_TYPE(self_in, &dict_type));
+    mp_obj_dict_t *self = self_in;
+    mp_obj_dict_t *other = mp_obj_new_dict(self->map.alloc);
+    other->map.used = self->map.used;
+    memcpy(other->map.table, self->map.table, self->map.alloc * sizeof(mp_map_elem_t));
+    return other;
+}
+static MP_DEFINE_CONST_FUN_OBJ_1(dict_copy_obj, dict_copy);
 
 /******************************************************************************/
 /* dict constructors & etc                                                    */
@@ -143,6 +152,7 @@ const mp_obj_type_t dict_type = {
     .getiter = dict_getiter,
     .methods = {
         { "clear", &dict_clear_obj },
+        { "copy", &dict_copy_obj },
         { NULL, NULL }, // end-of-list sentinel
     },
 };
diff --git a/tests/basics/tests/dict_copy.py b/tests/basics/tests/dict_copy.py
new file mode 100644
index 0000000000..c3eb7ffc18
--- /dev/null
+++ b/tests/basics/tests/dict_copy.py
@@ -0,0 +1,5 @@
+a = {i: 2*i for i in range(1000)}
+b = a.copy()
+for i in range(1000):
+    print(i, b[i])
+print(len(b))