fails to build with Python 3.13

[Cikmo]

• asyncpg version: 0.29.0
• Python version: 3.13.0rc2
• Platform: Linux
• Did you install asyncpg with pip?: Yes
• If you built asyncpg locally, which version of Cython did you use?: n/a
• Can the issue be reproduced under both asyncio and
  uvloop?: yes

Fails to build on Python 3.13. There's been various API changes.

      asyncpg/pgproto/pgproto.c:23886:18: warning: ‘__pyx_f_7asyncpg_7pgproto_7pgproto_json_encode’ defined but not used [-Wunused-function]
      23886 | static PyObject *__pyx_f_7asyncpg_7pgproto_7pgproto_json_encode(struct __pyx_obj_7asyncpg_7pgproto_7pgproto_CodecContext *__pyx_v_settings, struct __pyx_obj_7asyncpg_7pgproto_7pgproto_WriteBuffer *__pyx_v_buf, PyObject *__pyx_v_obj) {
            |                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

      /home/username/.pyenv/versions/3.13.0rc2/include/python3.13/cpython/longobject.h:111:17: note: declared here
        111 | PyAPI_FUNC(int) _PyLong_AsByteArray(PyLongObject* v,
            |                 ^~~~~~~~~~~~~~~~~~~

Read more: MagicStack/uvloop#603

[musicinmybrain]

If it helps, we’re successfully building and testing asyncpg with Python 3.13 in Fedora using the following adaptations:

• A downstream-only patch to remove the upper bound on the uvloop test dependency – although writing this prompts me to open Allow testing with uvloop on Python 3.12 #1182 to at least allow testing with uvloop on Python 3.12.
• A patch for Allow Cython 3 (fix #1083) #1101, which has been merged but not released.
• A patch for Replace obsolete, unsafe Py_TRASHCAN_SAFE_BEGIN/END #1150, which has been merged but not released.
• Skip tests tests/test_connect.py::TestClientSSLConnection::test_ssl_connection_client_auth_custom_context and tests/test_connect.py::TestClientSSLConnection::test_ssl_connection_client_auth_fails_with_wrong_setup, as discussed in Replace obsolete, unsafe Py_TRASHCAN_SAFE_BEGIN/END #1150 (comment). Ideally, the underlying certificate issue could be fixed.

And, of course, we remove any pre-generated Cythonized C sources and re-generate them with a current Cython (3.0.11):

# Remove pre-generated C sources from Cython to ensure they are re-generated
# and not used in the build. Note that recordobj.c is not a generated source,
# and must not be removed!
find asyncpg -type f -name '*.c' ! -name 'recordobj.c' -print -delete

(We also export the environment variable ASYNCPG_BUILD_CYTHON_ALWAYS=1, which might not be necessary once we’ve removed any pre-generated Cythonized C sources.)

[kamikaze]

same issue here

[sylvainmouquet]

same error but when i set the github repository, it works with python versions 3.9, 3.10, 3.11, 3.12 and 3.13:

[tool.uv.sources]
asyncpg = { git = "https://github.com/MagicStack/asyncpg"}

When the next release is planned ?

[juergenzimmermann]

pip install ... also fails on a Windows box. The output is attached.
windows-python-3.13..txt

[Kwieeciol]

same issue on Mac

ERROR: Failed building wheel for asyncpg
Failed to build asyncpg
ERROR: ERROR: Failed to build installable wheels for some pyproject.toml based projects (asyncpg)