diff -r 89b738e3d0c9 Modules/sha1module.c
--- a/Modules/sha1module.c	Thu Jan 23 09:49:42 2014 +0200
+++ b/Modules/sha1module.c	Thu Jan 23 17:02:33 2014 +0800
@@ -19,6 +19,11 @@
 #include "Python.h"
 #include "hashlib.h"
 
+/*[clinic input]
+module _sha1
+class SHA1Type
+[clinic start generated code]*/
+/*[clinic end generated code: checksum=da39a3ee5e6b4b0d3255bfef95601890afd80709]*/
 
 /* Some useful types */
 
@@ -373,18 +378,28 @@
     return retval;
 }
 
-PyDoc_STRVAR(SHA1_update__doc__,
-"Update this hash object's state with the provided string.");
+/*[clinic input]
+SHA1Type.update
+    self: self(type="SHA1object *")
+    obj: object
+    /
+
+Update this hash object's state with the provided string.
+[clinic start generated code]*/
+
+PyDoc_STRVAR(SHA1Type_update__doc__,
+"update(obj)\n"
+"Update this hash object\'s state with the provided string.");
+
+#define SHA1TYPE_UPDATE_METHODDEF    \
+    {"update", (PyCFunction)SHA1Type_update, METH_O, SHA1Type_update__doc__},
 
 static PyObject *
-SHA1_update(SHA1object *self, PyObject *args)
+SHA1Type_update(SHA1object *self, PyObject *obj)
+/*[clinic end generated code: checksum=23ad52911f5a274a2f4092842027bdf983db88e6]*/
 {
-    PyObject *obj;
     Py_buffer buf;
 
-    if (!PyArg_ParseTuple(args, "O:update", &obj))
-        return NULL;
-
     GET_BUFFER_VIEW_OR_ERROUT(obj, &buf);
 
     sha1_process(&self->hash_state, buf.buf, buf.len);
@@ -398,7 +413,7 @@
     {"copy",      (PyCFunction)SHA1_copy,      METH_NOARGS,  SHA1_copy__doc__},
     {"digest",    (PyCFunction)SHA1_digest,    METH_NOARGS,  SHA1_digest__doc__},
     {"hexdigest", (PyCFunction)SHA1_hexdigest, METH_NOARGS,  SHA1_hexdigest__doc__},
-    {"update",    (PyCFunction)SHA1_update,    METH_VARARGS, SHA1_update__doc__},
+    SHA1TYPE_UPDATE_METHODDEF
     {NULL,        NULL}         /* sentinel */
 };
 
@@ -474,27 +489,53 @@
 
 /* The single module-level function: new() */
 
-PyDoc_STRVAR(SHA1_new__doc__,
+/*[clinic input]
+_sha1.sha1
+
+    string: object = NULL
+
+Return a new SHA1 hash object; optionally initialized with a string.
+[clinic start generated code]*/
+
+PyDoc_STRVAR(_sha1_sha1__doc__,
+"sha1(string=None)\n"
 "Return a new SHA1 hash object; optionally initialized with a string.");
 
+#define _SHA1_SHA1_METHODDEF    \
+    {"sha1", (PyCFunction)_sha1_sha1, METH_VARARGS|METH_KEYWORDS, _sha1_sha1__doc__},
+
 static PyObject *
-SHA1_new(PyObject *self, PyObject *args, PyObject *kwdict)
+_sha1_sha1_impl(PyModuleDef *module, PyObject *string);
+
+static PyObject *
+_sha1_sha1(PyModuleDef *module, PyObject *args, PyObject *kwargs)
 {
-    static char *kwlist[] = {"string", NULL};
+    PyObject *return_value = NULL;
+    static char *_keywords[] = {"string", NULL};
+    PyObject *string = NULL;
+
+    if (!PyArg_ParseTupleAndKeywords(args, kwargs,
+        "|O:sha1", _keywords,
+        &string))
+        goto exit;
+    return_value = _sha1_sha1_impl(module, string);
+
+exit:
+    return return_value;
+}
+
+static PyObject *
+_sha1_sha1_impl(PyModuleDef *module, PyObject *string)
+/*[clinic end generated code: checksum=84867afb305cd7b7a69e62e303a39318e0fbd2df]*/
+{
     SHA1object *new;
-    PyObject *data_obj = NULL;
     Py_buffer buf;
 
-    if (!PyArg_ParseTupleAndKeywords(args, kwdict, "|O:new", kwlist,
-                                     &data_obj)) {
-        return NULL;
-    }
-
-    if (data_obj)
-        GET_BUFFER_VIEW_OR_ERROUT(data_obj, &buf);
+    if (string)
+        GET_BUFFER_VIEW_OR_ERROUT(string, &buf);
 
     if ((new = newSHA1object()) == NULL) {
-        if (data_obj)
+        if (string)
             PyBuffer_Release(&buf);
         return NULL;
     }
@@ -503,11 +544,11 @@
 
     if (PyErr_Occurred()) {
         Py_DECREF(new);
-        if (data_obj)
+        if (string)
             PyBuffer_Release(&buf);
         return NULL;
     }
-    if (data_obj) {
+    if (string) {
         sha1_process(&new->hash_state, buf.buf, buf.len);
         PyBuffer_Release(&buf);
     }
@@ -519,7 +560,7 @@
 /* List of functions exported by this module */
 
 static struct PyMethodDef SHA1_functions[] = {
-    {"sha1",(PyCFunction)SHA1_new, METH_VARARGS|METH_KEYWORDS,SHA1_new__doc__},
+    _SHA1_SHA1_METHODDEF
     {NULL,      NULL}            /* Sentinel */
 };