# HG changeset patch
# User Antoine Pitrou <solipsis@pitrou.net>
# Date 1259423758 0
# Node ID 83c702c17e0218df96592eb27a97a8ba63c747e0
# Parent  14ee75b86a5f041d531bcb41e62947bdeecfc7d1
Issue #1515: Enable use of deepcopy() with instance methods.  Patch by Robert Collins.

diff --git a/Lib/copy.py b/Lib/copy.py
--- a/Lib/copy.py
+++ b/Lib/copy.py
@@ -260,6 +260,10 @@ d[dict] = _deepcopy_dict
 if PyStringMap is not None:
     d[PyStringMap] = _deepcopy_dict
 
+def _deepcopy_method(x, memo): # Copy instance methods
+    return type(x)(x.im_func, deepcopy(x.im_self, memo), x.im_class)
+_deepcopy_dispatch[types.MethodType] = _deepcopy_method
+
 def _keep_alive(x, memo):
     """Keeps a reference to the object x in the memo.
 
diff --git a/Lib/test/test_copy.py b/Lib/test/test_copy.py
--- a/Lib/test/test_copy.py
+++ b/Lib/test/test_copy.py
@@ -672,6 +672,17 @@ class TestCopy(unittest.TestCase):
         bar = lambda: None
         self.assertEqual(copy.deepcopy(bar), bar)
 
+    def test_deepcopy_bound_method(self):
+        class Foo(object):
+            def m(self):
+                pass
+        f = Foo()
+        f.b = f.m
+        g = copy.deepcopy(f)
+        self.assertEqual(g.m, g.b)
+        self.assertTrue(g.b.im_self is g)
+        g.b()
+
 def global_foo(x, y): return x+y