Issue #7989: Added pure python implementation of the datetime module.

Misc/NEWS

@@ -473,6 +473,14 @@ C-API
 Library
 -------
 
+- Issue #7989: Added pure python implementation of the `datetime`
+  module.  The C module is renamed to `_datetime` and if available,
+  overrides all classes defined in datetime with fast C impementation.
+  Python implementation is based on the original python prototype for
+  the datetime module by Tim Peters with minor modifications by the
+  PyPy project.  The test suite now tests `datetime` module with and
+  without `_datetime` acceleration using the same test cases.
+
 - Issue #7895: platform.mac_ver() no longer crashes after calling os.fork()
 
 - Issue #9323: Fixed a bug in trace.py that resulted in loosing the

Modules/Setup.dist

@@ -170,7 +170,7 @@ _symtable symtablemodule.c
 #atexit atexitmodule.c      # Register functions to be run at interpreter-shutdown
 #_elementtree -I$(srcdir)/Modules/expat -DHAVE_EXPAT_CONFIG_H -DUSE_PYEXPAT_CAPI _elementtree.c	# elementtree accelerator
 #_pickle _pickle.c	# pickle accelerator
-#datetime datetimemodule.c	# date/time type
+#_datetime _datetimemodule.c	# datetime accelerator
 #_bisect _bisectmodule.c	# Bisection algorithms
 #_heapq _heapqmodule.c	# Heap queue algorithm
 

Modules/_datetimemodule.c

@@ -25,7 +25,7 @@
  * final result fits in a C int (this can be an issue on 64-bit boxes).
  */
 #if SIZEOF_INT < 4
-#       error "datetime.c requires that C int have at least 32 bits"
+#       error "_datetime.c requires that C int have at least 32 bits"
 #endif
 
 #define MINYEAR 1
@@ -5086,7 +5086,7 @@ static PyDateTime_CAPI CAPI = {
 
 static struct PyModuleDef datetimemodule = {
     PyModuleDef_HEAD_INIT,
-    "datetime",
+    "_datetime",
     "Fast implementation of the datetime type.",
     -1,
     module_methods,
@@ -5097,7 +5097,7 @@ static struct PyModuleDef datetimemodule = {
 };
 
 PyMODINIT_FUNC
-PyInit_datetime(void)
+PyInit__datetime(void)
 {
     PyObject *m;        /* a module object */
     PyObject *d;        /* its dict */

PC/config.c

@@ -43,7 +43,7 @@ extern PyObject* PyInit__sre(void);
 extern PyObject* PyInit_parser(void);
 extern PyObject* PyInit_winreg(void);
 extern PyObject* PyInit__struct(void);
-extern PyObject* PyInit_datetime(void);
+extern PyObject* PyInit__datetime(void);
 extern PyObject* PyInit__functools(void);
 extern PyObject* PyInit__json(void);
 extern PyObject* PyInit_zlib(void);
@@ -116,7 +116,7 @@ struct _inittab _PyImport_Inittab[] = {
     {"parser", PyInit_parser},
     {"winreg", PyInit_winreg},
     {"_struct", PyInit__struct},
-    {"datetime", PyInit_datetime},
+    {"_datetime", PyInit__datetime},
     {"_functools", PyInit__functools},
     {"_json", PyInit__json},
 

PCbuild/pythoncore.vcproj

@@ -1068,7 +1068,7 @@
 				>
 			</File>
 			<File
-				RelativePath="..\Modules\datetimemodule.c"
+				RelativePath="..\Modules\_datetimemodule.c"
 				>
 			</File>
 			<File

setup.py

@@ -452,7 +452,7 @@ def detect_modules(self):
         # time operations and variables
         exts.append( Extension('time', ['timemodule.c', '_time.c'],
                                libraries=math_libs) )
-        exts.append( Extension('datetime', ['datetimemodule.c', '_time.c'],
+        exts.append( Extension('_datetime', ['_datetimemodule.c', '_time.c'],
                                libraries=math_libs) )
         # fast iterator tools implemented in C
         exts.append( Extension("itertools", ["itertoolsmodule.c"]) )