https://github.com/python/cpython/commit/e132893cc710bbf1646ef8b33621ce9030e2d0ad
commit: e132893cc710bbf1646ef8b33621ce9030e2d0ad
branch: 3.13
author: Stan Ulbrych <[email protected]>
committer: serhiy-storchaka <[email protected]>
date: 2025-12-25T12:57:20+02:00
summary:

[3.13] gh-143135: Fix sys.flags.inspect when PYTHONINSPECT=0 (GH-143136) 
(GH-143168)

(cherry picked from commit 3509fa5a12855805f0c6d7f8a6a3b162744a8fd4)

files:
A Misc/NEWS.d/next/Core and 
Builtins/2025-12-24-11-39-59.gh-issue-143135.3d5ovx.rst
M Python/initconfig.c

diff --git a/Misc/NEWS.d/next/Core and 
Builtins/2025-12-24-11-39-59.gh-issue-143135.3d5ovx.rst b/Misc/NEWS.d/next/Core 
and Builtins/2025-12-24-11-39-59.gh-issue-143135.3d5ovx.rst
new file mode 100644
index 00000000000000..2ff08b44355704
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and 
Builtins/2025-12-24-11-39-59.gh-issue-143135.3d5ovx.rst 
@@ -0,0 +1,2 @@
+Set :data:`sys.flags.inspect` to ``1`` when :envvar:`PYTHONINSPECT` is ``0``.
+Previously, it was set to ``0`` in this case.
diff --git a/Python/initconfig.c b/Python/initconfig.c
index fc16576680585a..5cc7e6cd21186d 100644
--- a/Python/initconfig.c
+++ b/Python/initconfig.c
@@ -1576,7 +1576,9 @@ config_read_env_vars(PyConfig *config)
     _Py_get_env_flag(use_env, &config->parser_debug, "PYTHONDEBUG");
     _Py_get_env_flag(use_env, &config->verbose, "PYTHONVERBOSE");
     _Py_get_env_flag(use_env, &config->optimization_level, "PYTHONOPTIMIZE");
-    _Py_get_env_flag(use_env, &config->inspect, "PYTHONINSPECT");
+    if (!config->inspect && _Py_GetEnv(use_env, "PYTHONINSPECT")) {
+        config->inspect = 1;
+    }
 
     int dont_write_bytecode = 0;
     _Py_get_env_flag(use_env, &dont_write_bytecode, "PYTHONDONTWRITEBYTECODE");

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