[Python-checkins] bpo-45000: Raise SyntaxError when try to delete __debug__ (GH-27947)

miss-islington webhook-mailer at python.org
Wed Aug 25 13:54:34 EDT 2021

commit: 551da597a0996b0fb3af425f48aa5bc63ea6b963
branch: main
author: Dong-hee Na <donghee.na at python.org>
committer: miss-islington <31488909+miss-islington at users.noreply.github.com>
date: 2021-08-25T10:54:20-07:00

bpo-45000: Raise SyntaxError when try to delete __debug__ (GH-27947)

Automerge-Triggered-By: GH:pablogsal

A Misc/NEWS.d/next/Core and Builtins/2021-08-25-23-17-32.bpo-45000.XjmyLl.rst
M Doc/whatsnew/3.11.rst
M Lib/test/test_syntax.py
M Python/compile.c

diff --git a/Doc/whatsnew/3.11.rst b/Doc/whatsnew/3.11.rst
index 306385c2a90aa..296b1b279d09b 100644
--- a/Doc/whatsnew/3.11.rst
+++ b/Doc/whatsnew/3.11.rst
@@ -176,6 +176,8 @@ Other CPython Implementation Changes
   support :class:`typing.SupportsComplex` and :class:`typing.SupportsBytes` protocols.
   (Contributed by Mark Dickinson and Dong-hee Na in :issue:`24234`.)
+*  A :exc:`SyntaxError` (instead of a :exc:`NameError`) will be raised when deleting the :const:`__debug__` constant. (Contributed by Dong-hee Na in :issue:`45000`.)
 New Modules
diff --git a/Lib/test/test_syntax.py b/Lib/test/test_syntax.py
index 88503dcaad99b..43780ce273ef4 100644
--- a/Lib/test/test_syntax.py
+++ b/Lib/test/test_syntax.py
@@ -59,6 +59,10 @@
 Traceback (most recent call last):
 SyntaxError: cannot assign to __debug__
+>>> del __debug__
+Traceback (most recent call last):
+SyntaxError: cannot delete __debug__
 >>> f() = 1
 Traceback (most recent call last):
 SyntaxError: cannot assign to function call here. Maybe you meant '==' instead of '='?
diff --git a/Misc/NEWS.d/next/Core and Builtins/2021-08-25-23-17-32.bpo-45000.XjmyLl.rst b/Misc/NEWS.d/next/Core and Builtins/2021-08-25-23-17-32.bpo-45000.XjmyLl.rst
new file mode 100644
index 0000000000000..96c95cc6e0296
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2021-08-25-23-17-32.bpo-45000.XjmyLl.rst	
@@ -0,0 +1,2 @@
+A :exc:`SyntaxError` is now raised when trying to delete :const:`__debug__`.
+Patch by Dong-hee Na.
diff --git a/Python/compile.c b/Python/compile.c
index e651ca535191a..053915e55df9a 100644
--- a/Python/compile.c
+++ b/Python/compile.c
@@ -2343,6 +2343,10 @@ forbidden_name(struct compiler *c, identifier name, expr_context_ty ctx)
         compiler_error(c, "cannot assign to __debug__");
         return 1;
+    if (ctx == Del && _PyUnicode_EqualToASCIIString(name, "__debug__")) {
+        compiler_error(c, "cannot delete __debug__");
+        return 1;
+    }
     return 0;

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