Prepare collections module for pure python code entries.

Lib/collections.py

+__all__ = ['deque', 'defaultdict']
+
+from _collections import deque, defaultdict

Modules/collectionsmodule.c → Modules/_collectionsmodule.c

@@ -1337,11 +1337,11 @@ PyDoc_STRVAR(module_doc,
 ");
 
 PyMODINIT_FUNC
-initcollections(void)
+init_collections(void)
 {
 	PyObject *m;
 
-	m = Py_InitModule3("collections", NULL, module_doc);
+	m = Py_InitModule3("_collections", NULL, module_doc);
 	if (m == NULL)
 		return;
 

PC/config.c

@@ -43,7 +43,7 @@ extern void initxxsubtype(void);
 extern void initzipimport(void);
 extern void init_random(void);
 extern void inititertools(void);
-extern void initcollections(void);
+extern void init_collections(void);
 extern void init_heapq(void);
 extern void init_bisect(void);
 extern void init_symtable(void);
@@ -124,7 +124,7 @@ struct _inittab _PyImport_Inittab[] = {
         {"_heapq", init_heapq},
 	{"_lsprof", init_lsprof},
 	{"itertools", inititertools},
-        {"collections", initcollections},
+        {"_collections", init_collections},
 	{"_symtable", init_symtable},
 	{"mmap", initmmap},
 	{"_csv", init_csv},

PCbuild/pythoncore.vcproj

@@ -458,7 +458,7 @@
 			RelativePath="..\Objects\codeobject.c">
 		</File>
 		<File
-			RelativePath="..\Modules\collectionsmodule.c">
+			RelativePath="..\Modules\_collectionsmodule.c">
 		</File>
 		<File
 			RelativePath="..\Python\compile.c">

PCbuild8/pythoncore.vcproj

@@ -1381,7 +1381,7 @@
 			>
 		</File>
 		<File
-			RelativePath="..\Modules\collectionsmodule.c"
+			RelativePath="..\Modules\_collectionsmodule.c"
 			>
 		</File>
 		<File

setup.py

@@ -370,7 +370,7 @@ class PyBuildExt(build_ext):
         # fast iterator tools implemented in C
         exts.append( Extension("itertools", ["itertoolsmodule.c"]) )
         # high-performance collections
-        exts.append( Extension("collections", ["collectionsmodule.c"]) )
+        exts.append( Extension("_collections", ["_collectionsmodule.c"]) )
         # bisect
         exts.append( Extension("_bisect", ["_bisectmodule.c"]) )
         # heapq