https://github.com/python/cpython/commit/425f60b9eb253c57bc32b453a02f1cf09963f85a
commit: 425f60b9eb253c57bc32b453a02f1cf09963f85a
branch: main
author: Jelle Zijlstra <[email protected]>
committer: JelleZijlstra <[email protected]>
date: 2025-03-29T21:15:48Z
summary:
gh-130924: Do not create cells for usages of names in local annotations
(#131843)
files:
A
Misc/NEWS.d/next/Core_and_Builtins/2025-03-28-07-39-10.gh-issue-130924.l2Rbmj.rst
M Include/internal/pycore_symtable.h
M Lib/test/test_type_annotations.py
M Python/symtable.c
diff --git a/Include/internal/pycore_symtable.h
b/Include/internal/pycore_symtable.h
index a347db16722961..98099b4a497b01 100644
--- a/Include/internal/pycore_symtable.h
+++ b/Include/internal/pycore_symtable.h
@@ -126,6 +126,7 @@ typedef struct _symtable_entry {
unsigned ste_method : 1; /* true if block is a function block defined in
class scope */
unsigned ste_has_conditional_annotations : 1; /* true if block has
conditionally executed annotations */
unsigned ste_in_conditional_block : 1; /* set while we are inside a
conditionally executed block */
+ unsigned ste_in_unevaluated_annotation : 1; /* set while we are processing
an annotation that will not be evaluated */
int ste_comp_iter_expr; /* non-zero if visiting a comprehension range
expression */
_Py_SourceLocation ste_loc; /* source location of block */
struct _symtable_entry *ste_annotation_block; /* symbol table entry for
this entry's annotations */
diff --git a/Lib/test/test_type_annotations.py
b/Lib/test/test_type_annotations.py
index 60908546bb2653..9c70d27d29e89c 100644
--- a/Lib/test/test_type_annotations.py
+++ b/Lib/test/test_type_annotations.py
@@ -3,7 +3,7 @@
import textwrap
import types
import unittest
-from test.support import run_code, check_syntax_error
+from test.support import run_code, check_syntax_error, cpython_only
class TypeAnnotationTests(unittest.TestCase):
@@ -109,6 +109,16 @@ class D(metaclass=C):
del D.__annotations__
self.assertEqual(D.__annotations__, {})
+ @cpython_only
+ def test_no_cell(self):
+ # gh-130924: Test that uses of annotations in local scopes do not
+ # create cell variables.
+ def f(x):
+ a: x
+ return x
+
+ self.assertEqual(f.__code__.co_cellvars, ())
+
def build_module(code: str, name: str = "top") -> types.ModuleType:
ns = run_code(code)
@@ -352,6 +362,7 @@ def
test_no_exotic_expressions_in_unevaluated_annotations(self):
check_syntax_error(self, prelude + "(x): (yield)", "yield
expression cannot be used within an annotation")
check_syntax_error(self, prelude + "(x): (yield from x)",
"yield expression cannot be used within an annotation")
check_syntax_error(self, prelude + "(x): (y := 3)", "named
expression cannot be used within an annotation")
+ check_syntax_error(self, prelude + "(x): (__debug__ := 3)",
"named expression cannot be used within an annotation")
check_syntax_error(self, prelude + "(x): (await 42)", "await
expression cannot be used within an annotation")
def test_ignore_non_simple_annotations(self):
diff --git
a/Misc/NEWS.d/next/Core_and_Builtins/2025-03-28-07-39-10.gh-issue-130924.l2Rbmj.rst
b/Misc/NEWS.d/next/Core_and_Builtins/2025-03-28-07-39-10.gh-issue-130924.l2Rbmj.rst
new file mode 100644
index 00000000000000..ce6285f91bc86a
--- /dev/null
+++
b/Misc/NEWS.d/next/Core_and_Builtins/2025-03-28-07-39-10.gh-issue-130924.l2Rbmj.rst
@@ -0,0 +1,3 @@
+Usage of a name in a function-scope annotation no longer triggers creation
+of a cell for that variable. This fixes a regression in earlier alphas of
+Python 3.14.
diff --git a/Python/symtable.c b/Python/symtable.c
index 622cd528f3a481..748bd447dab0ad 100644
--- a/Python/symtable.c
+++ b/Python/symtable.c
@@ -141,6 +141,7 @@ ste_new(struct symtable *st, identifier name, _Py_block_ty
block,
ste->ste_needs_classdict = 0;
ste->ste_has_conditional_annotations = 0;
ste->ste_in_conditional_block = 0;
+ ste->ste_in_unevaluated_annotation = 0;
ste->ste_annotation_block = NULL;
ste->ste_has_docstring = 0;
@@ -2538,17 +2539,19 @@ symtable_visit_expr(struct symtable *st, expr_ty e)
VISIT(st, expr, e->v.Slice.step);
break;
case Name_kind:
- if (!symtable_add_def_ctx(st, e->v.Name.id,
- e->v.Name.ctx == Load ? USE : DEF_LOCAL,
- LOCATION(e), e->v.Name.ctx)) {
- return 0;
- }
- /* Special-case super: it counts as a use of __class__ */
- if (e->v.Name.ctx == Load &&
- _PyST_IsFunctionLike(st->st_cur) &&
- _PyUnicode_EqualToASCIIString(e->v.Name.id, "super")) {
- if (!symtable_add_def(st, &_Py_ID(__class__), USE, LOCATION(e)))
+ if (!st->st_cur->ste_in_unevaluated_annotation) {
+ if (!symtable_add_def_ctx(st, e->v.Name.id,
+ e->v.Name.ctx == Load ? USE : DEF_LOCAL,
+ LOCATION(e), e->v.Name.ctx)) {
return 0;
+ }
+ /* Special-case super: it counts as a use of __class__ */
+ if (e->v.Name.ctx == Load &&
+ _PyST_IsFunctionLike(st->st_cur) &&
+ _PyUnicode_EqualToASCIIString(e->v.Name.id, "super")) {
+ if (!symtable_add_def(st, &_Py_ID(__class__), USE,
LOCATION(e)))
+ return 0;
+ }
}
break;
/* child nodes of List and Tuple will have expr_context set */
@@ -2733,6 +2736,9 @@ symtable_visit_params(struct symtable *st, asdl_arg_seq
*args)
static int
symtable_visit_annotation(struct symtable *st, expr_ty annotation, void *key)
{
+ // Annotations in local scopes are not executed and should not affect the
symtable
+ bool is_unevaluated = st->st_cur->ste_type == FunctionBlock;
+
if ((st->st_cur->ste_type == ClassBlock || st->st_cur->ste_type ==
ModuleBlock)
&& st->st_cur->ste_in_conditional_block
&& !st->st_cur->ste_has_conditional_annotations)
@@ -2764,11 +2770,17 @@ symtable_visit_annotation(struct symtable *st, expr_ty
annotation, void *key)
return 0;
}
}
- VISIT(st, expr, annotation);
+ if (is_unevaluated) {
+ st->st_cur->ste_in_unevaluated_annotation = 1;
+ }
+ int rc = symtable_visit_expr(st, annotation);
+ if (is_unevaluated) {
+ st->st_cur->ste_in_unevaluated_annotation = 0;
+ }
if (!symtable_exit_block(st)) {
return 0;
}
- return 1;
+ return rc;
}
static int
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