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Start testing Python 3.15 #21439

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1564ab5
Start testing Python 3.15
cdce8p May 8, 2026
cdbfe44
Update virtualenv pin
cdce8p May 8, 2026
ca12414
Update pygments pin
cdce8p May 8, 2026
9227bdf
Fix tests
cdce8p May 8, 2026
6e168e6
Reorder include
cdce8p May 8, 2026
4fda5ee
Add classifier for Python 3.15
cdce8p May 8, 2026
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7 changes: 7 additions & 0 deletions .github/workflows/test.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -59,6 +59,12 @@ jobs:
toxenv: py
tox_extra_args: "-n 4"
test_mypyc: true
- name: Test suite with py315-ubuntu, mypyc-compiled
python: '3.15'
os: ubuntu-24.04-arm
toxenv: py
tox_extra_args: "-n 4"
test_mypyc: true
- name: Test suite with py314t-ubuntu, mypyc-compiled
python: '3.14t'
os: ubuntu-24.04-arm
Expand Down Expand Up @@ -196,6 +202,7 @@ jobs:
if: ${{ !(matrix.debug_build || endsWith(matrix.python, '-dev')) }}
with:
python-version: ${{ matrix.python }}
allow-prereleases: true

- name: Install tox
run: |
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2 changes: 1 addition & 1 deletion mypyc/codegen/emit.py
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Expand Up @@ -233,7 +233,7 @@ def object_annotation(self, obj: object, line: str) -> str:

If it contains illegal characters, an empty string is returned."""
line_width = self._indent + len(line)
formatted = pprint.pformat(obj, compact=True, width=max(90 - line_width, 20))
formatted = pprint.pformat(obj, compact=True, indent=1, width=max(90 - line_width, 20))
if any(x in formatted for x in ("/*", "*/", "\0")):
return ""

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2 changes: 1 addition & 1 deletion mypyc/lib-rt/byteswriter_extra_ops.h
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@@ -1,9 +1,9 @@
#ifndef BYTESWRITER_EXTRA_OPS_H
#define BYTESWRITER_EXTRA_OPS_H

#include <Python.h>
#include <stdbool.h>
#include <stdint.h>
#include <Python.h>
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@cdce8p cdce8p May 8, 2026

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Some librt tests only compile individual c files. If Python.h isn't included first, these tests would raise ‘_POSIX_C_SOURCE’ redefined warnings on Python 3.15.

See https://bugzilla.redhat.com/show_bug.cgi?id=2416110 for a similar issue
https://docs.python.org/3/c-api/intro.html#include-files

--
No need to backport anything specifically as building librt completely works fine already. It's just if only individual files are compiled.


#include "mypyc_util.h"
#include "strings/librt_strings_api.h"
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2 changes: 1 addition & 1 deletion mypyc/lib-rt/function_wrapper.c
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@@ -1,6 +1,6 @@
#define PY_SSIZE_T_CLEAN
#include <stdint.h>
#include "CPy.h"
#include <stdint.h>

#define CPyFunction_weakreflist(f) (((PyCFunctionObject *)f)->m_weakreflist)
#define CPyFunction_class(f) ((PyObject*) ((PyCMethodObject *) (f))->mm_class)
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2 changes: 1 addition & 1 deletion mypyc/lib-rt/stringwriter_extra_ops.h
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@@ -1,9 +1,9 @@
#ifndef STRINGWRITER_EXTRA_OPS_H
#define STRINGWRITER_EXTRA_OPS_H

#include <Python.h>
#include <stdbool.h>
#include <stdint.h>
#include <Python.h>

#include "mypyc_util.h"
#include "strings/librt_strings_api.h"
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5 changes: 4 additions & 1 deletion mypyc/test-data/run-misc.test
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Expand Up @@ -971,7 +971,10 @@ print(z)
[case testCheckVersion]
import sys

if sys.version_info[:2] == (3, 15):
if sys.version_info[:2] == (3, 16):
def version() -> int:
return 16
elif sys.version_info[:2] == (3, 15):
def version() -> int:
return 15
elif sys.version_info[:2] == (3, 14):
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3 changes: 2 additions & 1 deletion mypyc/test-data/run-python312.test
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Expand Up @@ -229,9 +229,10 @@ type C[*Ts] = tuple[*Ts]
def test_type_var_tuple_type_alias() -> None:
if sys.version_info >= (3, 15): # type: ignore[operator]
assert str(C[int, str]) == "_frozen_importlib.C[int, str]"
assert str(getattr(C, "__value__")) == "tuple[typing.Unpack[~Ts]]"
else:
assert str(C[int, str]) == "C[int, str]"
assert str(getattr(C, "__value__")) == "tuple[typing.Unpack[Ts]]"
assert str(getattr(C, "__value__")) == "tuple[typing.Unpack[Ts]]"

type D[**P] = Callable[P, int]

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1 change: 1 addition & 0 deletions pyproject.toml
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Expand Up @@ -46,6 +46,7 @@ classifiers = [
"Programming Language :: Python :: 3.12",
"Programming Language :: Python :: 3.13",
"Programming Language :: Python :: 3.14",
"Programming Language :: Python :: 3.15",
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@cdce8p cdce8p May 8, 2026

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For 3.14 we added the classifier during the beta as well, once all tests passed. See #19199.

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@hauntsaninja hauntsaninja May 9, 2026

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I'm okay with this, but it would be nice to make sure we support some of the headline features like lazy imports before we make a release with this classifier

"Topic :: Software Development",
"Typing :: Typed",
]
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4 changes: 2 additions & 2 deletions test-data/unit/cmdline.test
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Expand Up @@ -363,11 +363,11 @@ mypy: error: Mypy no longer supports checking Python 2 code. Consider pinning to
python_version = 3.10
[out]

[case testPythonVersionAccepted314]
[case testPythonVersionAccepted315]
# cmd: mypy -c pass
[file mypy.ini]
\[mypy]
python_version = 3.14
python_version = 3.15
[out]

[case testPythonVersionFallback]
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4 changes: 2 additions & 2 deletions test-requirements.txt
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Expand Up @@ -46,7 +46,7 @@ pre-commit==4.3.0
# via -r test-requirements.in
psutil==7.1.0
# via -r test-requirements.in
pygments==2.19.2
pygments==2.20.0
# via pytest
pytest==8.4.2
# via
Expand All @@ -67,7 +67,7 @@ types-setuptools==80.9.0.20250822
# via -r build-requirements.txt
typing-extensions==4.15.0
# via -r mypy-requirements.txt
virtualenv==20.34.0
virtualenv==20.35.4
# via pre-commit

# The following packages are considered to be unsafe in a requirements file:
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1 change: 1 addition & 0 deletions tox.ini
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Expand Up @@ -7,6 +7,7 @@ envlist =
py312,
py313,
py314,
py315,
docs,
lint,
type,
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