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gh-137814: Fix __qualname__ of __annotate__ #137842

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Merged
JelleZijlstra merged 7 commits into from
Apr 16, 2026
Merged

gh-137814: Fix __qualname__ of __annotate__ #137842

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f29b8b9
gh-137814: Fix `__qualname__` of `__annotate__`
JelleZijlstra Aug 16, 2025
e6f1adf
fix bug and refleak
JelleZijlstra Aug 16, 2025
b4ae25b
Alternative approach
JelleZijlstra Aug 16, 2025
3a50dbc
Revert "Alternative approach"
JelleZijlstra Aug 16, 2025
81bdb7d
Merge branch 'main' into annotate-qualname
JelleZijlstra Nov 3, 2025
c70cf57
Merge branch 'main' into annotate-qualname
JelleZijlstra Apr 7, 2026
7de447d
magic
JelleZijlstra Apr 7, 2026
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gh-137814: Fix __qualname__ of __annotate__
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@JelleZijlstra
JelleZijlstra committed Aug 16, 2025
commit f29b8b91563904e51c4898ad78207279f93a4715
1 change: 1 addition & 0 deletions Include/internal/pycore_symtable.h
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Expand Up @@ -90,6 +90,7 @@ typedef struct _symtable_entry {
PyObject *ste_id; /* int: key in ste_table->st_blocks */
PyObject *ste_symbols; /* dict: variable names to flags */
PyObject *ste_name; /* string: name of current block */
PyObject *ste_function_name; /* string or NULL: for annotation blocks: name of the corresponding functions */
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@iritkatriel iritkatriel Aug 16, 2025

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We can’t use ste_name for this?

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@JelleZijlstra JelleZijlstra Aug 16, 2025

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It's possible but I don't know if it's better. I just pushed a version that does this.

PyObject *ste_varnames; /* list of function parameters */
PyObject *ste_children; /* list of child blocks */
PyObject *ste_directives;/* locations of global and nonlocal statements */
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14 changes: 14 additions & 0 deletions Lib/test/test_type_annotations.py
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Expand Up @@ -835,3 +835,17 @@ def test_complex_comprehension_inlining_exec(self):
genexp = annos["unique_name_2"][0]
lamb = list(genexp)[0]
self.assertEqual(lamb(), 42)

def test_annotate_qualname(self):
code = """
def f() -> None: pass
class Outer:
x: int
def method(self, x: int):
pass
"""
ns = run_code(code)
method = ns["Outer"].method
self.assertEqual(method.__annotate__.__qualname__, "Outer.method.__annotate__")
self.assertEqual(ns["f"].__annotate__.__qualname__, "f.__annotate__")
self.assertEqual(ns["Outer"].__annotate__.__qualname__, "Outer.__annotate__")
2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Core_and_Builtins/2025-08-15-21-33-16.gh-issue-137814.6yRTeu.rst
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@@ -0,0 +1,2 @@
Fix the ``__qualname__`` attribute of ``__annotate__`` functions on
functions.
11 changes: 11 additions & 0 deletions Python/compile.c
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Expand Up @@ -289,6 +289,17 @@ compiler_set_qualname(compiler *c)
base = Py_NewRef(parent->u_metadata.u_qualname);
}
}
if (u->u_ste->ste_function_name != NULL) {
base = PyUnicode_FromFormat("%U.%U",
parent->u_metadata.u_qualname,
u->u_ste->ste_function_name);
if (base == NULL) {
return ERROR;
}
}
}
else if (u->u_ste->ste_function_name != NULL) {
base = Py_NewRef(u->u_ste->ste_function_name);
}

if (base != NULL) {
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3 changes: 3 additions & 0 deletions Python/symtable.c
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Expand Up @@ -108,6 +108,7 @@ ste_new(struct symtable *st, identifier name, _Py_block_ty block,
ste->ste_id = k; /* ste owns reference to k */

ste->ste_name = Py_NewRef(name);
ste->ste_function_name = NULL;

ste->ste_symbols = NULL;
ste->ste_varnames = NULL;
Expand Down Expand Up @@ -185,6 +186,7 @@ ste_dealloc(PyObject *op)
ste->ste_table = NULL;
Py_XDECREF(ste->ste_id);
Py_XDECREF(ste->ste_name);
Py_XDECREF(ste->ste_function_name);
Py_XDECREF(ste->ste_symbols);
Py_XDECREF(ste->ste_varnames);
Py_XDECREF(ste->ste_children);
Expand Down Expand Up @@ -2830,6 +2832,7 @@ symtable_visit_annotations(struct symtable *st, stmt_ty o, arguments_ty a, expr_
(void *)a, LOCATION(o))) {
return 0;
}
Py_XSETREF(st->st_cur->ste_function_name, Py_NewRef(function_ste->ste_name));
if (is_in_class || current_type == ClassBlock) {
st->st_cur->ste_can_see_class_scope = 1;
if (!symtable_add_def(st, &_Py_ID(__classdict__), USE, LOCATION(o))) {
Expand Down
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