2 files changed, 58 insertions, 1 deletions
diff --git a/Modules/_codecsmodule.c b/Modules/_codecsmodule.c
index 2e8cb97fe7..08a3d4ab02 100644
--- a/Modules/_codecsmodule.c
+++ b/Modules/_codecsmodule.c
@@ -160,6 +160,25 @@ _codecs_decode_impl(PyObject *module, PyObject *obj, const char *encoding,
 
 /* --- Helpers ------------------------------------------------------------ */
 
+/*[clinic input]
+_codecs._forget_codec
+
+    encoding: str
+    /
+
+Purge the named codec from the internal codec lookup cache
+[clinic start generated code]*/
+
+static PyObject *
+_codecs__forget_codec_impl(PyObject *module, const char *encoding)
+/*[clinic end generated code: output=0bde9f0a5b084aa2 input=18d5d92d0e386c38]*/
+{
+    if (_PyCodec_Forget(encoding) < 0) {
+        return NULL;
+    };
+    Py_RETURN_NONE;
+}
+
 static
 PyObject *codec_tuple(PyObject *decoded,
                       Py_ssize_t len)
@@ -1038,6 +1057,7 @@ static PyMethodDef _codecs_functions[] = {
     _CODECS_CODE_PAGE_DECODE_METHODDEF
     _CODECS_REGISTER_ERROR_METHODDEF
     _CODECS_LOOKUP_ERROR_METHODDEF
+    _CODECS__FORGET_CODEC_METHODDEF
     {NULL, NULL}                /* sentinel */
 };
 
diff --git a/Modules/clinic/_codecsmodule.c.h b/Modules/clinic/_codecsmodule.c.h
index 43378f94f9..e2ebb68612 100644
--- a/Modules/clinic/_codecsmodule.c.h
+++ b/Modules/clinic/_codecsmodule.c.h
@@ -217,6 +217,43 @@ exit:
     return return_value;
 }
 
+PyDoc_STRVAR(_codecs__forget_codec__doc__,
+"_forget_codec($module, encoding, /)\n"
+"--\n"
+"\n"
+"Purge the named codec from the internal codec lookup cache");
+
+#define _CODECS__FORGET_CODEC_METHODDEF    \
+    {"_forget_codec", (PyCFunction)_codecs__forget_codec, METH_O, _codecs__forget_codec__doc__},
+
+static PyObject *
+_codecs__forget_codec_impl(PyObject *module, const char *encoding);
+
+static PyObject *
+_codecs__forget_codec(PyObject *module, PyObject *arg)
+{
+    PyObject *return_value = NULL;
+    const char *encoding;
+
+    if (!PyUnicode_Check(arg)) {
+        _PyArg_BadArgument("_forget_codec", "argument", "str", arg);
+        goto exit;
+    }
+    Py_ssize_t encoding_length;
+    encoding = PyUnicode_AsUTF8AndSize(arg, &encoding_length);
+    if (encoding == NULL) {
+        goto exit;
+    }
+    if (strlen(encoding) != (size_t)encoding_length) {
+        PyErr_SetString(PyExc_ValueError, "embedded null character");
+        goto exit;
+    }
+    return_value = _codecs__forget_codec_impl(module, encoding);
+
+exit:
+    return return_value;
+}
+
 PyDoc_STRVAR(_codecs_escape_decode__doc__,
 "escape_decode($module, data, errors=None, /)\n"
 "--\n"
@@ -2801,4 +2838,4 @@ exit:
 #ifndef _CODECS_CODE_PAGE_ENCODE_METHODDEF
     #define _CODECS_CODE_PAGE_ENCODE_METHODDEF
 #endif /* !defined(_CODECS_CODE_PAGE_ENCODE_METHODDEF) */
-/*[clinic end generated code: output=557c3b37e4c492ac input=a9049054013a1b77]*/
+/*[clinic end generated code: output=9a97e2ddf3e69072 input=a9049054013a1b77]*/