Issue 2408: remove the _types module

It was only used as a helper in types.py to access types (GetSetDescriptorType and MemberDescriptorType),
when they can easily be obtained with python code.
These expressions even work with Jython.

I don't know what the future of the types module is; (cf. discussion in http://bugs.python.org/issue1605 )
at least this change makes it simpler.

Doc/library/types.rst

@@ -233,20 +233,22 @@ The module defines the following names:
 
 .. data:: GetSetDescriptorType
 
-   The type of objects defined in extension modules with ``PyGetSetDef``, such as
-   ``FrameType.f_locals`` or ``array.array.typecode``.  This constant is not
-   defined in implementations of Python that do not have such extension types, so
-   for portable code use ``hasattr(types, 'GetSetDescriptorType')``.
+   The type of objects defined in extension modules with ``PyGetSetDef``, such
+   as ``FrameType.f_locals`` or ``array.array.typecode``.  This type is used as
+   descriptor for object attributes; it has the same purpose as the
+   :class:`property` type, but for classes defined in extension modules.
 
    .. versionadded:: 2.5
 
 
 .. data:: MemberDescriptorType
 
-   The type of objects defined in extension modules with ``PyMemberDef``, such as
-   ``datetime.timedelta.days``.  This constant is not defined in implementations of
-   Python that do not have such extension types, so for portable code use
-   ``hasattr(types, 'MemberDescriptorType')``.
+   The type of objects defined in extension modules with ``PyMemberDef``, such
+   as ``datetime.timedelta.days``.  This type is used as descriptor for simple C
+   data members which use standard conversion functions; it has the same purpose
+   as the :class:`property` type, but for classes defined in extension modules.
+   In other implementations of Python, this type may be identical to
+   ``GetSetDescriptorType``.
 
    .. versionadded:: 2.5
 

Lib/types.py

@@ -86,16 +86,8 @@ EllipsisType = type(Ellipsis)
 DictProxyType = type(TypeType.__dict__)
 NotImplementedType = type(NotImplemented)
 
-# Extension types defined in a C helper module.  XXX There may be no
-# equivalent in implementations other than CPython, so it seems better to
-# leave them undefined then to set them to e.g. None.
-try:
-    import _types
-except ImportError:
-    pass
-else:
-    GetSetDescriptorType = type(_types.Helper.getter)
-    MemberDescriptorType = type(_types.Helper.member)
-    del _types
+# For Jython, the following two types are identical
+GetSetDescriptorType = type(FunctionType.func_code)
+MemberDescriptorType = type(FunctionType.func_globals)
 
 del sys, _f, _g, _C, _x                           # Not for export

Makefile.pre.in

@@ -333,7 +333,6 @@ OBJECT_OBJS=	\
 ##########################################################################
 # objects that get linked into the Python library
 LIBRARY_OBJS=	\
-		Modules/_typesmodule.o \
 		Modules/getbuildinfo.o \
 		$(PARSER_OBJS) \
 		$(OBJECT_OBJS) \
@@ -371,7 +370,6 @@ sharedmods: $(BUILDPYTHON)
 $(LIBRARY): $(LIBRARY_OBJS)
 	-rm -f $@
 	$(AR) cr $@ Modules/getbuildinfo.o
-	$(AR) cr $@ Modules/_typesmodule.o
 	$(AR) cr $@ $(PARSER_OBJS)
 	$(AR) cr $@ $(OBJECT_OBJS)
 	$(AR) cr $@ $(PYTHON_OBJS)

Modules/_typesmodule.c

-/* This extension module exposes some types that are only available at the
- * C level.  It should not be used directly, but instead through the Python
- * level types modules, which imports this.
- */
-
-#include "Python.h"
-#include "structmember.h"
-
-typedef struct
-{
-    PyObject_HEAD
-    int member;
-} Helper;
-
-static PyMemberDef helper_members[] = {
-    { "member", T_INT,  offsetof(Helper, member), READONLY,
-      PyDoc_STR("A member descriptor")
-    },
-    { NULL }
-};
-
-static PyObject *
-helper_getter(Helper *self, void *unused) 
-{
-    Py_RETURN_NONE;
-}
-
-static PyGetSetDef helper_getset[] = {
-    { "getter", (getter)helper_getter, NULL,
-      PyDoc_STR("A getset descriptor"),
-    },
-    { NULL }
-};
-
-static PyTypeObject HelperType = {
-    PyVarObject_HEAD_INIT(NULL, 0)
-    "_types.Helper",				/* tp_name */
-    sizeof(Helper),                             /* tp_basicsize */
-    0,						/* tp_itemsize */
-    0,						/* tp_dealloc */
-    0,						/* tp_print */
-    0,						/* tp_getattr */
-    0,						/* tp_setattr */
-    0,						/* tp_compare */
-    0,                                          /* tp_repr */
-    0,                                          /* tp_as_number */
-    0,						/* tp_as_sequence */
-    0,						/* tp_as_mapping */
-    0,                                          /* tp_hash */
-    0,              				/* tp_call */
-    0,          				/* tp_str */
-    0,                                          /* tp_getattro */
-    0,						/* tp_setattro */
-    0,						/* tp_as_buffer */
-    Py_TPFLAGS_DEFAULT,                         /* tp_flags */
-    0,      					/* tp_doc */
-    0,						/* tp_traverse */
-    0,						/* tp_clear */
-    0,                                          /* tp_richcompare */
-    0,						/* tp_weaklistoffset */
-    0,						/* tp_iter */
-    0,						/* tp_iternext */
-    0,      					/* tp_methods */
-    helper_members,                             /* tp_members */
-    helper_getset,                              /* tp_getset */
-    0,						/* tp_base */
-    0,						/* tp_dict */
-    0,						/* tp_descr_get */
-    0,						/* tp_descr_set */
-    0,						/* tp_dictoffset */
-    0,						/* tp_init */
-    0,						/* tp_alloc */
-    0,                                          /* tp_new */
-    0,						/* tp_free */
-};
-
-PyMODINIT_FUNC
-init_types(void)
-{
-    PyObject *m;
-
-    m = Py_InitModule3("_types", NULL, "A types module helper");
-    if (!m)
-        return;
-
-    if (PyType_Ready(&HelperType) < 0)
-        return;
-
-    Py_INCREF(&HelperType);
-    PyModule_AddObject(m, "Helper", (PyObject *)&HelperType);
-}
-
-    

Modules/config.c.in

@@ -28,7 +28,6 @@ extern void PyMarshal_Init(void);
 extern void initimp(void);
 extern void initgc(void);
 extern void init_ast(void);
-extern void init_types(void);
 
 struct _inittab _PyImport_Inittab[] = {
 
@@ -43,9 +42,6 @@ struct _inittab _PyImport_Inittab[] = {
 	/* This lives in Python/Python-ast.c */
 	{"_ast", init_ast},
 
-	/* This lives in Modules/_typesmodule.c */
-	{"_types", init_types},
-
 	/* These entries are here for sys.builtin_module_names */
 	{"__main__", NULL},
 	{"__builtin__", NULL},

PC/VC6/pythoncore.dsp

@@ -173,10 +173,6 @@ SOURCE=..\..\PC\_subprocess.c
 # End Source File
 # Begin Source File
 
-SOURCE=..\..\Modules\_typesmodule.c
-# End Source File
-# Begin Source File
-
 SOURCE=..\..\Modules\_weakref.c
 # End Source File
 # Begin Source File

PC/VS7.1/pythoncore.vcproj

@@ -397,9 +397,6 @@
 		<File
 			RelativePath="..\..\Pc\_subprocess.c">
 		</File>
-		<File
-			RelativePath="..\..\Modules\_typesmodule.c">
-		</File>
 		<File
 			RelativePath="..\..\Modules\_weakref.c">
 		</File>

PC/VS8.0/pythoncore.vcproj

@@ -1022,10 +1022,6 @@
 				RelativePath="..\..\Modules\_struct.c"
 				>
 			</File>
-			<File
-				RelativePath="..\..\Modules\_typesmodule.c"
-				>
-			</File>
 			<File
 				RelativePath="..\..\Modules\_weakref.c"
 				>

PC/config.c

@@ -66,7 +66,6 @@ extern void init_codecs_tw(void);
 extern void init_subprocess(void);
 extern void init_lsprof(void);
 extern void init_ast(void);
-extern void init_types(void);
 
 /* tools/freeze/makeconfig.py marker for additional "extern" */
 /* -- ADDMODULE MARKER 1 -- */
@@ -161,8 +160,6 @@ struct _inittab _PyImport_Inittab[] = {
         {"sys", NULL},
 	{"exceptions", NULL},
         
-        {"_types", init_types},
-
         /* Sentinel */
         {0, 0}
 };

PCbuild/pythoncore.vcproj

@@ -1022,10 +1022,6 @@
 				RelativePath="..\Modules\_struct.c"
 				>
 			</File>
-			<File
-				RelativePath="..\Modules\_typesmodule.c"
-				>
-			</File>
 			<File
 				RelativePath="..\Modules\_weakref.c"
 				>