From 9639e4ab6d5bd3ca0ab34fef127e9fc84b6b88b9 Mon Sep 17 00:00:00 2001
From: Serhiy Storchaka <storchaka@gmail.com>
Date: Mon, 20 Feb 2017 14:04:30 +0200
Subject: [PATCH] bpo-29532: Altering a kwarg dictionary passed to
 functools.partial() (#190)

no longer affects a partial object after creation.
---
 Lib/test/test_functools.py | 9 +++++++++
 Misc/NEWS                  | 3 +++
 Modules/_functoolsmodule.c | 5 ++++-
 3 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/Lib/test/test_functools.py b/Lib/test/test_functools.py
index 63fe83e5dbd..612ca17a60b 100644
--- a/Lib/test/test_functools.py
+++ b/Lib/test/test_functools.py
@@ -90,6 +90,15 @@ class TestPartial:
         p(b=7)
         self.assertEqual(d, {'a':3})
 
+    def test_kwargs_copy(self):
+        # Issue #29532: Altering a kwarg dictionary passed to a constructor
+        # should not affect a partial object after creation
+        d = {'a': 3}
+        p = self.partial(capture, **d)
+        self.assertEqual(p(), ((), {'a': 3}))
+        d['a'] = 5
+        self.assertEqual(p(), ((), {'a': 3}))
+
     def test_arg_combinations(self):
         # exercise special code paths for zero args in either partial
         # object or the caller
diff --git a/Misc/NEWS b/Misc/NEWS
index 0c2a5730e31..fa7e3f5a5e7 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -232,6 +232,9 @@ Extension Modules
 Library
 -------
 
+- bpo-29532: Altering a kwarg dictionary passed to functools.partial()
+  no longer affects a partial object after creation.
+
 - bpo-22807: Add uuid.SafeUUID and uuid.UUID.is_safe to relay information from
   the platform about whether generated UUIDs are generated with a
   multiprocessing safe method.
diff --git a/Modules/_functoolsmodule.c b/Modules/_functoolsmodule.c
index 4170883368f..c8565054c90 100644
--- a/Modules/_functoolsmodule.c
+++ b/Modules/_functoolsmodule.c
@@ -88,10 +88,13 @@ partial_new(PyTypeObject *type, PyObject *args, PyObject *kw)
         if (kw == NULL) {
             pto->kw = PyDict_New();
         }
-        else {
+        else if (Py_REFCNT(kw) == 1) {
             Py_INCREF(kw);
             pto->kw = kw;
         }
+        else {
+            pto->kw = PyDict_Copy(kw);
+        }
     }
     else {
         pto->kw = PyDict_Copy(pkw);