https://github.com/python/cpython/commit/10f616cf3939f87605081d05c1913ba630046c54
commit: 10f616cf3939f87605081d05c1913ba630046c54
branch: 3.15
author: Victor Stinner <[email protected]>
committer: vstinner <[email protected]>
date: 2026-06-10T22:03:27+02:00
summary:
[3.15] gh-151253: Dump the Python path configuration on _PyCodec_InitRegistry()
failure (#151250) (#151269)
gh-151253: Dump the Python path configuration on _PyCodec_InitRegistry()
failure (#151250)
If "import encodings" fails at Python startup, dump the Python path
configuration to help users debugging their configuration. The
encodings module is the first module imported during Python startup.
(cherry picked from commit 7b6e98911e1485be13817f2aedbbfadb1c4ea876)
files:
A
Misc/NEWS.d/next/Core_and_Builtins/2026-06-10-15-42-46.gh-issue-151253.7MMQ8P.rst
M Lib/test/test_cmd_line.py
M Python/codecs.c
diff --git a/Lib/test/test_cmd_line.py b/Lib/test/test_cmd_line.py
index 3b556ec31445df..a8645af26b25d8 100644
--- a/Lib/test/test_cmd_line.py
+++ b/Lib/test/test_cmd_line.py
@@ -1314,6 +1314,17 @@ def test_presite(self):
proc = assert_python_ok("-X", f"presite={entrypoint}", "-c", "pass")
self.assertEqual(proc.out.rstrip(), b"presite func")
+ def test_dump_path_config(self):
+ # gh-151253: At the first import (import encodings) during Python
+ # startup, if the import fails, dump the Python path configuration.
+ nonexistent = '/nonexistent-python-path'
+ # Use -X frozen_modules=off to disable frozen encodings module
+ # on release build.
+ cmd = ["-X", "frozen_modules=off", "-c", "pass"]
+ proc = assert_python_failure(*cmd, PYTHONHOME=nonexistent)
+ self.assertIn(b'Python path configuration:', proc.err)
+ self.assertIn(f"PYTHONHOME = '{nonexistent}'".encode(), proc.err)
+
@unittest.skipIf(interpreter_requires_environment(),
'Cannot run -I tests when PYTHON env vars are required.')
diff --git
a/Misc/NEWS.d/next/Core_and_Builtins/2026-06-10-15-42-46.gh-issue-151253.7MMQ8P.rst
b/Misc/NEWS.d/next/Core_and_Builtins/2026-06-10-15-42-46.gh-issue-151253.7MMQ8P.rst
new file mode 100644
index 00000000000000..56d2f3b2633bb0
--- /dev/null
+++
b/Misc/NEWS.d/next/Core_and_Builtins/2026-06-10-15-42-46.gh-issue-151253.7MMQ8P.rst
@@ -0,0 +1,3 @@
+If ``import encodings`` (first import) fails at Python startup, dump the
+Python path configuration to help users debugging their configuration. Patch
+by Victor Stinner.
diff --git a/Python/codecs.c b/Python/codecs.c
index 0bde56c0ac662e..2cf8460d2087cf 100644
--- a/Python/codecs.c
+++ b/Python/codecs.c
@@ -10,6 +10,7 @@ Copyright (c) Corporation for National Research Initiatives.
#include "Python.h"
#include "pycore_call.h" // _PyObject_CallNoArgs()
+#include "pycore_initconfig.h" // _Py_DumpPathConfig()
#include "pycore_interp.h" // PyInterpreterState.codec_search_path
#include "pycore_pyerrors.h" // _PyErr_FormatNote()
#include "pycore_pystate.h" // _PyInterpreterState_GET()
@@ -1685,6 +1686,8 @@ _PyCodec_InitRegistry(PyInterpreterState *interp)
// search functions, so this is done after everything else is initialized.
PyObject *mod = PyImport_ImportModule("encodings");
if (mod == NULL) {
+ PyThreadState *tstate = _PyThreadState_GET();
+ _Py_DumpPathConfig(tstate);
return PyStatus_Error("Failed to import encodings module");
}
Py_DECREF(mod);
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