fix signature error in test_inspect.py

This is temporary as which module should the function be put is not determined yet in the discourse discussion.

Author: tanloong

Lib/test/test_inspect/test_inspect.py

@@ -6154,14 +6154,18 @@ def test_builtins_have_signatures(self):
                 methods_no_signature, methods_unsupported_signature)
 
     def test_types_module_has_signatures(self):
+        no_signature = set()
+        # These need PEP 457 groups
+        needs_groups = {'lookup_special'}
+        no_signature |= needs_groups
         unsupported_signature = {'CellType'}
         methods_no_signature = {
             'AsyncGeneratorType': {'athrow'},
             'CoroutineType': {'throw'},
             'GeneratorType': {'throw'},
             'FrameLocalsProxyType': {'setdefault', 'pop', 'get'},
         }
-        self._test_module_has_signatures(types,
+        self._test_module_has_signatures(types, no_signature,
                 unsupported_signature=unsupported_signature,
                 methods_no_signature=methods_no_signature)
 

Modules/_typesmodule.c

@@ -14,7 +14,7 @@ PyDoc_STRVAR(lookup_special_doc,
 \n\
 Lookup method name `name` on `object` skipping the instance dictionary.\n\
 `name` must be a string. If the named special attribute does not\n\
-exist,`default` is returned if provided, otherwise AttributeError is raised.");
+exist,`default` is returned if provided, otherwise `AttributeError` is raised.");
 
 static PyObject *
 _types_lookup_special_impl(PyObject *self, PyObject *const *args, Py_ssize_t nargs)