Issue #20294: Argument Clinic now supports argument parsing for __new__ and

__init__ functions.

Python/getargs.c

@@ -1805,7 +1805,7 @@ PyArg_UnpackTuple(PyObject *args, const char *name, Py_ssize_t min, Py_ssize_t m
 
 /* For type constructors that don't take keyword args
  *
- * Sets a TypeError and returns 0 if the kwds dict is
+ * Sets a TypeError and returns 0 if the args/kwargs is
  * not empty, returns 1 otherwise
  */
 int
@@ -1824,6 +1824,25 @@ _PyArg_NoKeywords(const char *funcname, PyObject *kw)
                     funcname);
     return 0;
 }
+
+
+int
+_PyArg_NoPositional(const char *funcname, PyObject *args)
+{
+    if (args == NULL)
+        return 1;
+    if (!PyTuple_CheckExact(args)) {
+        PyErr_BadInternalCall();
+        return 0;
+    }
+    if (PyTuple_GET_SIZE(args) == 0)
+        return 1;
+
+    PyErr_Format(PyExc_TypeError, "%s does not take positional arguments",
+                    funcname);
+    return 0;
+}
+
 #ifdef __cplusplus
 };
 #endif