bpo-45000: Raise SyntaxError when try to delete __debug__ (GH-27947) (GH-27957)

corona10 · web-flow · commit 32c1caa87f68 · 2021-08-26T10:52:21.000+01:00
(cherry picked from commit 551da59)
diff --git 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
@@ -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
@@ -2264,6 +2264,10 @@ 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;
 }
 

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	+A :exc:`SyntaxError` is now raised when trying to delete :const:`__debug__`.
	`2`	`+Patch by Dong-hee Na.`
Original file line number	Diff line number	Diff line change
`@@ -2264,6 +2264,10 @@ forbidden_name(struct compiler *c, identifier name, expr_context_ty ctx)`
`2264`	`2264`	`compiler_error(c, "cannot assign to __debug__");`
`2265`	`2265`	`return 1;`
`2266`	`2266`	`}`
	`2267`	`+ if (ctx == Del && _PyUnicode_EqualToASCIIString(name, "__debug__")) {`
	`2268`	`+ compiler_error(c, "cannot delete __debug__");`
	`2269`	`+ return 1;`
	`2270`	`+ }`
`2267`	`2271`	`return 0;`
`2268`	`2272`	`}`
`2269`	`2273`