Issue #23338: Fixed formatting ctypes error messages on Cygwin.

Patch by Makoto Kato.

Misc/ACKS

@@ -703,6 +703,7 @@ Janne Karila
 Per Øyvind Karlsen
 Anton Kasyanov
 Lou Kates
+Makoto Kato
 Hiroaki Kawai
 Brian Kearns
 Sebastien Keim

Misc/NEWS

@@ -19,6 +19,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #23338: Fixed formatting ctypes error messages on Cygwin.
+  Patch by Makoto Kato.
+
 - Issue #15582: inspect.getdoc() now follows inheritance chains.
 
 - Issue #2175: SAX parsers now support a character stream of InputSource object.

Modules/_ctypes/_ctypes.c

@@ -593,7 +593,7 @@ CDataType_in_dll(PyObject *type, PyObject *args)
 #ifdef __CYGWIN__
 /* dlerror() isn't very helpful on cygwin */
         PyErr_Format(PyExc_ValueError,
-                     "symbol '%s' not found (%s) ",
+                     "symbol '%s' not found",
                      name);
 #else
         PyErr_SetString(PyExc_ValueError, ctypes_dlerror());
@@ -3280,7 +3280,7 @@ PyCFuncPtr_FromDll(PyTypeObject *type, PyObject *args, PyObject *kwds)
 #ifdef __CYGWIN__
 /* dlerror() isn't very helpful on cygwin */
         PyErr_Format(PyExc_AttributeError,
-                     "function '%s' not found (%s) ",
+                     "function '%s' not found",
                      name);
 #else
         PyErr_SetString(PyExc_AttributeError, ctypes_dlerror());