Issue #7092: Remove py3k warning when importing cPickle. 2to3 handles

renaming of `cPickle` to `pickle`.  The warning was annoying since there's
no alternative to cPickle if you care about performance.  Patch by Florent
Xicluna.

Lib/test/test_py3kwarn.py

@@ -336,7 +336,7 @@ class TestStdlibRemovals(unittest.TestCase):
                            'sunos5' : ('sunaudiodev', 'SUNAUDIODEV'),
                           }
     optional_modules = ('bsddb185', 'Canvas', 'dl', 'linuxaudiodev', 'imageop',
-                        'sv', 'cPickle', 'bsddb', 'dbhash')
+                        'sv', 'bsddb', 'dbhash')
 
     def check_removal(self, module_name, optional=False):
         """Make sure the specified module, when imported, raises a

Misc/NEWS

@@ -65,6 +65,11 @@ Core and Builtins
 Library
 -------
 
+- Issue #7092: Remove py3k warning when importing cPickle.  2to3 handles
+  renaming of `cPickle` to `pickle`.  The warning was annoying since there's
+  no alternative to cPickle if you care about performance.  Patch by Florent
+  Xicluna.
+
 - Issue #7455: Fix possible crash in cPickle on invalid input.  Patch by
   Victor Stinner.
 

Modules/cPickle.c

@@ -5973,12 +5973,6 @@ initcPickle(void)
 	PyObject *format_version;
 	PyObject *compatible_formats;
 
-	/* XXX: Should mention that the pickle module will include the C
-	   XXX: optimized implementation automatically. */
-	if (PyErr_WarnPy3k("the cPickle module has been removed in "
-			   "Python 3.0", 2) < 0)
-		return;
-
 	Py_TYPE(&Picklertype) = &PyType_Type;
 	Py_TYPE(&Unpicklertype) = &PyType_Type;
 	Py_TYPE(&PdataType) = &PyType_Type;