python · zklaus · Aug 1, 2025 · Aug 6, 2025 · Aug 7, 2025 · Aug 7, 2025
diff --git a/Doc/library/sys.rst b/Doc/library/sys.rst
@@ -11,6 +11,24 @@ interpreter and to functions that interact strongly with the interpreter. It is
 always available. Unless explicitly noted otherwise, all variables are read-only.
 
 
+.. data:: abi_info
+
+   An object containing information about the ABI of the currently running
+   Python interpreter.  The following attributes are available in cpython:
+
+   *pointer_bits* is the width of pointers in bits, as an integer, equivalent
+   to ``8 * sizeof(void *)``, i.e. usually ``32`` or ``64``.
+
+   *Py_GIL_DISABLED* is a boolean indicating whether the interpreter was built
+   with the GIL disabled, i.e. with the :option:`--disable-gil` option,
+   aka free-threading.
+
+   *Py_DEBUG* is a boolean indicating whether the interpreter was built in
+   debug mode, i.e. with the :option:`--with-pydebug` option.
+
+   .. versionadded:: next
+
+
 .. data:: abiflags
 
    On POSIX systems where Python was built with the standard ``configure``

diff --git a/Lib/test/test_sys.py b/Lib/test/test_sys.py
@@ -739,6 +739,15 @@ def test_thread_info(self):
         elif sys.platform == "wasi":
             self.assertEqual(info.name, "pthread-stubs")
 
+    def test_abi_info(self):
+        info = sys.abi_info
+        self.assertEqual(len(info.__dict__), 3)
+        pointer_bits = 64 if sys.maxsize > 2**32 else 32
+        self.assertEqual(info.pointer_bits, pointer_bits)
+        for flag in ["Py_GIL_DISABLED", "Py_DEBUG"]:
+            self.assertEqual(getattr(info, flag, None),
+                             bool(sysconfig.get_config_var(flag)))
+
     @unittest.skipUnless(support.is_emscripten, "only available on Emscripten")
     def test_emscripten_info(self):
         self.assertEqual(len(sys._emscripten_info), 4)

diff --git a/Misc/NEWS.d/next/Core_and_Builtins/2025-08-06-16-55-44.gh-issue-133143.l7CI9v.rst b/Misc/NEWS.d/next/Core_and_Builtins/2025-08-06-16-55-44.gh-issue-133143.l7CI9v.rst
@@ -0,0 +1 @@
+Add ``sys.abi_info`` object to make ABI information more easily accessible.
@@ -3260,6 +3260,7 @@ PyDoc_STR(
 "\n\
 Static objects:\n\
 \n\
+abi_info -- a named tuple with information about the ABI.\n\
 builtin_module_names -- tuple of module names built into this interpreter\n\
 copyright -- copyright notice pertaining to this interpreter\n\
 exec_prefix -- prefix used to find the machine-specific Python library\n\
@@ -3630,6 +3631,56 @@ make_impl_info(PyObject *version_info)
     return NULL;
 }
 
+
+static PyObject *
+make_abi_info(void)
+{
+    int res;
+    PyObject *abi_info, *value, *ns;
+    abi_info = PyDict_New();
+    if (abi_info == NULL) {
+        goto error;
+    }
+
+    value = PyLong_FromLong(sizeof(void *) * 8);
+    if (value == NULL) {
+        goto error;
+    }
+    res = PyDict_SetItemString(abi_info, "pointer_bits", value);
+    Py_DECREF(value);
+    if (res < 0) {
+        goto error;
+    }
+
+#ifdef Py_GIL_DISABLED
+    value = Py_True;
+#else
+    value = Py_False;
+#endif
+    res = PyDict_SetItemString(abi_info, "Py_GIL_DISABLED", value);
+    if (res < 0) {
+        goto error;
+    }
+
+#ifdef Py_DEBUG
+    value = Py_True;
+#else
+    value = Py_False;
+#endif
+    res = PyDict_SetItemString(abi_info, "Py_DEBUG", value);
+    if (res < 0) {
+        goto error;
+    }
+
+    ns = _PyNamespace_New(abi_info);
+    Py_DECREF(abi_info);
+    return ns;
+
+error:
+    Py_CLEAR(abi_info);
+    return NULL;
+}
+
 #ifdef __EMSCRIPTEN__
 
 PyDoc_STRVAR(emscripten_info__doc__,
@@ -3855,6 +3906,8 @@ _PySys_InitCore(PyThreadState *tstate, PyObject *sysdict)
 
     SET_SYS("thread_info", PyThread_GetInfo());
 
+    SET_SYS("abi_info", make_abi_info());
+
     /* initialize asyncgen_hooks */
     if (_PyStructSequence_InitBuiltin(interp, &AsyncGenHooksType,
                                       &asyncgen_hooks_desc) < 0)
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		Add ``sys.abi_info`` object to make ABI information more easily accessible.