From: Raymond Hettinger <python@rcn.com>
Date: Mon, 9 Jan 2017 03:34:28 +0000 (-0800)
Subject: Sync-up lru_cache() C code with space saving feature in the Python version.
X-Git-Tag: v3.7.0a1~1599
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=9d60b94427f42b3f543e398205113a1b18b43598;p=python

Sync-up lru_cache() C code with space saving feature in the Python version.
---

diff --git a/Modules/_functoolsmodule.c b/Modules/_functoolsmodule.c
index 62b45e98cb..bc34c215b4 100644
--- a/Modules/_functoolsmodule.c
+++ b/Modules/_functoolsmodule.c
@@ -709,6 +709,12 @@ lru_cache_make_key(PyObject *args, PyObject *kwds, int typed)
 
     /* short path, key will match args anyway, which is a tuple */
     if (!typed && !kwds) {
+        if (PyTuple_GET_SIZE(args) == 1) {
+            /* Save space and improve speed by unwrapping 1-tuples */
+            key = PyTuple_GET_ITEM(args, 0);
+            Py_INCREF(key);
+            return key;
+        }
         Py_INCREF(args);
         return args;
     }