diff --git a/Misc/NEWS.d/next/Core and Builtins/2020-03-31-22-15-04.bpo-1635741.8Ir1a0.rst b/Misc/NEWS.d/next/Core and Builtins/2020-03-31-22-15-04.bpo-1635741.8Ir1a0.rst
new file mode 100644
index 00000000000000..e1c5a29916b1cf
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2020-03-31-22-15-04.bpo-1635741.8Ir1a0.rst
@@ -0,0 +1 @@
+Port :mod:`math` to multiphase initialization (:pep:`489`).
diff --git a/Modules/mathmodule.c b/Modules/mathmodule.c
index 2a73a983f56d2d..f1d59c09e6272c 100644
--- a/Modules/mathmodule.c
+++ b/Modules/mathmodule.c
@@ -3421,6 +3421,29 @@ math_ulp_impl(PyObject *module, double x)
return x2 - x;
}
+static int
+math_exec(PyObject *module)
+{
+ if (PyModule_AddObject(module, "pi", PyFloat_FromDouble(Py_MATH_PI)) < 0) {
+ return -1;
+ }
+ if (PyModule_AddObject(module, "e", PyFloat_FromDouble(Py_MATH_E)) < 0) {
+ return -1;
+ }
+ // 2pi
+ if (PyModule_AddObject(module, "tau", PyFloat_FromDouble(Py_MATH_TAU)) < 0) {
+ return -1;
+ }
+ if (PyModule_AddObject(module, "inf", PyFloat_FromDouble(m_inf())) < 0) {
+ return -1;
+ }
+#if !defined(PY_NO_SHORT_FLOAT_REPR) || defined(Py_NAN)
+ if (PyModule_AddObject(module, "nan", PyFloat_FromDouble(m_nan())) < 0) {
+ return -1;
+ }
+#endif
+ return 0;
+}
static PyMethodDef math_methods[] = {
{"acos", math_acos, METH_O, math_acos_doc},
@@ -3479,41 +3502,26 @@ static PyMethodDef math_methods[] = {
{NULL, NULL} /* sentinel */
};
+static PyModuleDef_Slot math_slots[] = {
+ {Py_mod_exec, math_exec},
+ {0, NULL}
+};
PyDoc_STRVAR(module_doc,
"This module provides access to the mathematical functions\n"
"defined by the C standard.");
-
static struct PyModuleDef mathmodule = {
PyModuleDef_HEAD_INIT,
- "math",
- module_doc,
- -1,
- math_methods,
- NULL,
- NULL,
- NULL,
- NULL
+ .m_name = "math",
+ .m_doc = module_doc,
+ .m_size = 0,
+ .m_methods = math_methods,
+ .m_slots = math_slots,
};
PyMODINIT_FUNC
PyInit_math(void)
{
- PyObject *m;
-
- m = PyModule_Create(&mathmodule);
- if (m == NULL)
- goto finally;
-
- PyModule_AddObject(m, "pi", PyFloat_FromDouble(Py_MATH_PI));
- PyModule_AddObject(m, "e", PyFloat_FromDouble(Py_MATH_E));
- PyModule_AddObject(m, "tau", PyFloat_FromDouble(Py_MATH_TAU)); /* 2pi */
- PyModule_AddObject(m, "inf", PyFloat_FromDouble(m_inf()));
-#if !defined(PY_NO_SHORT_FLOAT_REPR) || defined(Py_NAN)
- PyModule_AddObject(m, "nan", PyFloat_FromDouble(m_nan()));
-#endif
-
- finally:
- return m;
+ return PyModuleDef_Init(&mathmodule);
}
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