From d79b0592d0b241da8b27fca15828c9aecc60d51b Mon Sep 17 00:00:00 2001
From: Victor Stinner <vstinner@python.org>
Date: Fri, 25 Aug 2023 23:32:17 +0200
Subject: [PATCH] gh-85283: _statistics uses the limited C API

Argument Clinic supports positional-only arguments for the limited C
API.
---
 ...3-08-25-23-33-31.gh-issue-85283.7t0PPx.rst |  2 +
 Modules/_statisticsmodule.c                   |  2 +
 Modules/clinic/_statisticsmodule.c.h          | 46 ++-----------------
 3 files changed, 9 insertions(+), 41 deletions(-)
 create mode 100644 Misc/NEWS.d/next/Build/2023-08-25-23-33-31.gh-issue-85283.7t0PPx.rst

diff --git a/Misc/NEWS.d/next/Build/2023-08-25-23-33-31.gh-issue-85283.7t0PPx.rst b/Misc/NEWS.d/next/Build/2023-08-25-23-33-31.gh-issue-85283.7t0PPx.rst
new file mode 100644
index 00000000000000..032813101574ea
--- /dev/null
+++ b/Misc/NEWS.d/next/Build/2023-08-25-23-33-31.gh-issue-85283.7t0PPx.rst
@@ -0,0 +1,2 @@
+The ``_statistics`` C extension is now built with the :ref:`Limited API
+<limited-c-api>`. Patch by Victor Stinner.
diff --git a/Modules/_statisticsmodule.c b/Modules/_statisticsmodule.c
index 1d5465fbe6d04e..a055110ebeb70f 100644
--- a/Modules/_statisticsmodule.c
+++ b/Modules/_statisticsmodule.c
@@ -1,5 +1,7 @@
 /* statistics accelerator C extension: _statistics module. */
 
+#define Py_LIMITED_API 0x030d0000
+
 #include "Python.h"
 #include "clinic/_statisticsmodule.c.h"
 
diff --git a/Modules/clinic/_statisticsmodule.c.h b/Modules/clinic/_statisticsmodule.c.h
index 4dedadd2939ad6..289b39c52c80db 100644
--- a/Modules/clinic/_statisticsmodule.c.h
+++ b/Modules/clinic/_statisticsmodule.c.h
@@ -2,26 +2,20 @@
 preserve
 [clinic start generated code]*/
 
-#if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
-#  include "pycore_gc.h"            // PyGC_Head
-#  include "pycore_runtime.h"       // _Py_ID()
-#endif
-
-
 PyDoc_STRVAR(_statistics__normal_dist_inv_cdf__doc__,
 "_normal_dist_inv_cdf($module, p, mu, sigma, /)\n"
 "--\n"
 "\n");
 
 #define _STATISTICS__NORMAL_DIST_INV_CDF_METHODDEF    \
-    {"_normal_dist_inv_cdf", _PyCFunction_CAST(_statistics__normal_dist_inv_cdf), METH_FASTCALL, _statistics__normal_dist_inv_cdf__doc__},
+    {"_normal_dist_inv_cdf", (PyCFunction)_statistics__normal_dist_inv_cdf, METH_VARARGS, _statistics__normal_dist_inv_cdf__doc__},
 
 static double
 _statistics__normal_dist_inv_cdf_impl(PyObject *module, double p, double mu,
                                       double sigma);
 
 static PyObject *
-_statistics__normal_dist_inv_cdf(PyObject *module, PyObject *const *args, Py_ssize_t nargs)
+_statistics__normal_dist_inv_cdf(PyObject *module, PyObject *args)
 {
     PyObject *return_value = NULL;
     double p;
@@ -29,39 +23,9 @@ _statistics__normal_dist_inv_cdf(PyObject *module, PyObject *const *args, Py_ssi
     double sigma;
     double _return_value;
 
-    if (!_PyArg_CheckPositional("_normal_dist_inv_cdf", nargs, 3, 3)) {
+    if (!PyArg_ParseTuple(args, "ddd:_normal_dist_inv_cdf",
+        &p, &mu, &sigma))
         goto exit;
-    }
-    if (PyFloat_CheckExact(args[0])) {
-        p = PyFloat_AS_DOUBLE(args[0]);
-    }
-    else
-    {
-        p = PyFloat_AsDouble(args[0]);
-        if (p == -1.0 && PyErr_Occurred()) {
-            goto exit;
-        }
-    }
-    if (PyFloat_CheckExact(args[1])) {
-        mu = PyFloat_AS_DOUBLE(args[1]);
-    }
-    else
-    {
-        mu = PyFloat_AsDouble(args[1]);
-        if (mu == -1.0 && PyErr_Occurred()) {
-            goto exit;
-        }
-    }
-    if (PyFloat_CheckExact(args[2])) {
-        sigma = PyFloat_AS_DOUBLE(args[2]);
-    }
-    else
-    {
-        sigma = PyFloat_AsDouble(args[2]);
-        if (sigma == -1.0 && PyErr_Occurred()) {
-            goto exit;
-        }
-    }
     _return_value = _statistics__normal_dist_inv_cdf_impl(module, p, mu, sigma);
     if ((_return_value == -1.0) && PyErr_Occurred()) {
         goto exit;
@@ -71,4 +35,4 @@ _statistics__normal_dist_inv_cdf(PyObject *module, PyObject *const *args, Py_ssi
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=6899dc752cc6b457 input=a9049054013a1b77]*/
+/*[clinic end generated code: output=63371081183774c9 input=a9049054013a1b77]*/