[Python-checkins] [3.10] gh-92119: ctypes: Print exception class name instead of its representation (GH-98302) (#99452)

[JelleZijlstra]

https://github.com/python/cpython/commit/bc2cdfc81571dc759a90b94dd3f4858b98cad1eb
commit: bc2cdfc81571dc759a90b94dd3f4858b98cad1eb
branch: 3.10
author: Kamil Turek <kamil.turek at hotmail.com>
committer: JelleZijlstra <jelle.zijlstra at gmail.com>
date: 2022-11-13T15:55:58-08:00
summary:

[3.10] gh-92119: ctypes: Print exception class name instead of its representation (GH-98302) (#99452)

gh-92119: ctypes: Print exception class name instead of its representation (#98302)

(cherry picked from commit b9dedfe61dce2997e3e6be318d8c50b0c19c9394)

files:
A Misc/NEWS.d/next/Core and Builtins/2022-10-15-23-15-14.gh-issue-92119.PMSwwG.rst
M Doc/library/ctypes.rst
M Lib/ctypes/test/test_structures.py
M Modules/_ctypes/callproc.c

diff --git a/Doc/library/ctypes.rst b/Doc/library/ctypes.rst
index 18a942751bef..325ef72a4786 100644
--- a/Doc/library/ctypes.rst
+++ b/Doc/library/ctypes.rst
@@ -359,7 +359,7 @@ from within *IDLE* or *PythonWin*::
    >>> printf(b"%f bottles of beer\n", 42.5)
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
-   ArgumentError: argument 2: exceptions.TypeError: Don't know how to convert parameter 2
+   ArgumentError: argument 2: TypeError: Don't know how to convert parameter 2
    >>>
 
 As has been mentioned before, all Python types except integers, strings, and
@@ -422,7 +422,7 @@ prototype for a C function), and tries to convert the arguments to valid types::
    >>> printf(b"%d %d %d", 1, 2, 3)
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
-   ArgumentError: argument 2: exceptions.TypeError: wrong type
+   ArgumentError: argument 2: TypeError: wrong type
    >>> printf(b"%s %d %f\n", b"X", 2, 3)
    X 2 3.000000
    13
@@ -472,7 +472,7 @@ single character Python bytes object into a C char::
    >>> strchr(b"abcdef", b"def")
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
-   ArgumentError: argument 2: exceptions.TypeError: one character string expected
+   ArgumentError: argument 2: TypeError: one character string expected
    >>> print(strchr(b"abcdef", b"x"))
    None
    >>> strchr(b"abcdef", b"d")
diff --git a/Lib/ctypes/test/test_structures.py b/Lib/ctypes/test/test_structures.py
index 97ad2b8ed8a5..f95d5a99a3a1 100644
--- a/Lib/ctypes/test/test_structures.py
+++ b/Lib/ctypes/test/test_structures.py
@@ -332,13 +332,13 @@ class Person(Structure):
         cls, msg = self.get_except(Person, b"Someone", (1, 2))
         self.assertEqual(cls, RuntimeError)
         self.assertEqual(msg,
-                             "(Phone) <class 'TypeError'>: "
+                             "(Phone) TypeError: "
                              "expected bytes, int found")
 
         cls, msg = self.get_except(Person, b"Someone", (b"a", b"b", b"c"))
         self.assertEqual(cls, RuntimeError)
         self.assertEqual(msg,
-                             "(Phone) <class 'TypeError'>: too many initializers")
+                             "(Phone) TypeError: too many initializers")
 
     def test_huge_field_name(self):
         # issue12881: segfault with large structure field names
diff --git a/Misc/NEWS.d/next/Core and Builtins/2022-10-15-23-15-14.gh-issue-92119.PMSwwG.rst b/Misc/NEWS.d/next/Core and Builtins/2022-10-15-23-15-14.gh-issue-92119.PMSwwG.rst
new file mode 100644
index 000000000000..7142fc619765
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2022-10-15-23-15-14.gh-issue-92119.PMSwwG.rst	
@@ -0,0 +1,2 @@
+Print exception class name instead of its string representation when raising
+errors from :mod:`ctypes` calls.
diff --git a/Modules/_ctypes/callproc.c b/Modules/_ctypes/callproc.c
index 48694760dbed..e009661d4a23 100644
--- a/Modules/_ctypes/callproc.c
+++ b/Modules/_ctypes/callproc.c
@@ -1014,7 +1014,10 @@ void _ctypes_extend_error(PyObject *exc_class, const char *fmt, ...)
 
     PyErr_Fetch(&tp, &v, &tb);
     PyErr_NormalizeException(&tp, &v, &tb);
-    cls_str = PyObject_Str(tp);
+    if (PyType_Check(tp))
+        cls_str = PyUnicode_FromString(_PyType_Name((PyTypeObject *)tp));
+    else
+        cls_str = PyObject_Str(tp);
     if (cls_str) {
         PyUnicode_AppendAndDel(&s, cls_str);
         PyUnicode_AppendAndDel(&s, PyUnicode_FromString(": "));