gh-133970: Make PEP750 types generic (#133976)

Lib/test/test_genericalias.py

@@ -61,6 +61,7 @@ try:
     from tkinter import Event
 except ImportError:
     Event = None
+from string.templatelib import Template, Interpolation
 
 from typing import TypeVar
 T = TypeVar('T')
@@ -139,7 +140,10 @@ class BaseTest(unittest.TestCase):
                      DictReader, DictWriter,
                      array,
                      staticmethod,
-                     classmethod]
+                     classmethod,
+                     Template,
+                     Interpolation,
+                    ]
     if ctypes is not None:
         generic_types.extend((ctypes.Array, ctypes.LibraryLoader, ctypes.py_object))
     if ValueProxy is not None:

Misc/NEWS.d/next/Library/2025-05-13-18-54-56.gh-issue-133970.6G-Oi6.rst

@@ -0,0 +1,2 @@
+Make :class:`!string.templatelib.Template` and
+:class:`!string.templatelib.Interpolation` generic.

Objects/interpolationobject.c

@@ -137,6 +137,8 @@ interpolation_reduce(PyObject *op, PyObject *Py_UNUSED(dummy))
 static PyMethodDef interpolation_methods[] = {
     {"__reduce__", interpolation_reduce, METH_NOARGS,
         PyDoc_STR("__reduce__() -> (cls, state)")},
+    {"__class_getitem__", Py_GenericAlias,
+        METH_O|METH_CLASS, PyDoc_STR("See PEP 585")},
     {NULL, NULL},
 };
 

Objects/templateobject.c

@@ -444,6 +444,8 @@ template_reduce(PyObject *op, PyObject *Py_UNUSED(dummy))
 
 static PyMethodDef template_methods[] = {
     {"__reduce__", template_reduce, METH_NOARGS, NULL},
+    {"__class_getitem__", Py_GenericAlias,
+        METH_O|METH_CLASS, PyDoc_STR("See PEP 585")},
     {NULL, NULL},
 };